Thursday, November 25, 2021

Hacking CD/DVD/Blu-ray for Biosensing

ACS Sens. 2018 Jul 27; 3(7): 1222–1232.

Hacking CD/DVD/Blu-ray for Biosensing

Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Micro- and Nanotechnology, Technical University of Denmark, Lyngby 2800, Denmark

Received 2018 Apr 29; Accepted 2018 Jul 6.

This is an open access article published under an ACS AuthorChoice

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Abstract

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The optical pickup unit (OPU) within a CD/DVD/Blu-ray drive integrates 780, 650, and 405 nm wavelength lasers, diffraction-limited optics, a high-bandwidth optoelectronic transducer up to 400 MHz, and a nanoresolution x-, z-axis, and tilt actuator in a compact size. In addition, the OPU is a remarkable piece of engineering and could enable different scientific applications such as sub-angstrom displacement sensing, micro- and nanoimaging, and nanolithography. Although off-the-shelf OPUs can be easily obtained, manufacturers protect their datasheets under nondisclosure agreements to impede their availability to the public. Thus, OPUs are black boxes that few people can use for research, and only experienced researchers can access all their functions. This review details the OPU mechanism and components. In addition, we explain how to utilize three commercially available triple-wavelength OPUs from scratch and optimize sensing quality. Then, we discuss scientific research using OPUs, from standard optical drive-based turnkey-biomarker array reading and OPU direct bioapplications (cytometry, optical tweezing, bioimaging) to modified OPU-based biosensing (DNA chip fluorescence scanning, biomolecular diagnostics). We conclude by presenting future trends on optical storage devices and potential applications. Hacking low-cost and high-performance OPUs may spread micro- and nanoscale biosensing research from research laboratories to citizen scientists around the globe.

Keywords: compact disc (CD), digital versatile disc (DVD), Blu-ray, pptical pickup-unit (OPU), nanobio imaging, cytometer, optical tweezer, DNA chip, fluorescence, medical diagnostics

Some years ago, the global market of digitized music, video, and data storage pushed the capacity and speed of optical drives to their limits, with a huge amount of R&D investment. From compact discs (CDs), digital versatile discs (DVDs), to the most recent Blu-ray discs, the data capacity evolved from the megabyte (MB) to the gigabyte (GB). Likewise, mass production and outstanding sales dramatically reduced the cost of optical storage drives while maintaining high quality and performance. Nowadays, Blu-ray players (12× speed, 432 Mb/s) are affordable devices that reliably read 150 nm data pits from a spinning disc at 10,000 rpm.

Optical drive components have been used for research over the past decades, as they adopt an accessible standard of CD/DVD/Blu-ray disc, and the spindle motor can be used for centrifugal lab-on-disc applications.1,2 Most of this research relies on either commercially available optoelectrical sensing systems or customized sensing mechanisms.3−8 A seldom considered component inside optical drives is the optical pickup unit (OPU), which is essential for converting physical data pits into electric signals. A CD/DVD/Blu-ray drive OPU equips at least one triple-wavelength laser and optimized optical components to achieve the diffraction limit of light for high-density data-pit reading. To focus the laser spot perfectly on a spinning and wobbling disc, an objective lens is actuated by a high-bandwidth triple-axis precision actuator. The light intensity signal reflected from the data pits is then transduced by a specialized high-bandwidth optoelectrical component. These functions are compactly integrated within an eraser-sized box, representing a low-cost and high-performance engineering achievement.

Although off-the-shelf OPUs can be unrestrictedly purchased, accessing their full functions can be much more challenging. In fact, every manufacturer protects the OPU datasheets and hardware pin assignment under secrecy, and hence any researcher needs to either sign a nondisclosure agreement or reverse engineer the OPU to access its functions. This technical barrier has prevented researchers, especially those without an engineering background, from utilizing OPUs with research purposes, and only few groups have managed to access all the OPU functions for its use in applications such as sub-angstrom displacement sensing,9 micro- and nanoimaging,10 and nanolithography.11 Interestingly, an OPU-based low-cost atomic force microscope (AFM) has already democratized nanoimaging up to the point that even children can perform nanoscale measurements by themselves.12,13

Before exploiting the full potential of the OPU in a CD/DVD/Blu-ray drive, we must understand its mechanism and main components. We distinguish the types of OPUs that are flexible for scientific research and explain how to increase the signal-to-noise ratio and couple external optical sensors to enhance sensing quality. Then, we further describe how to control the OPU in practice, by using either specific software tools or customized circuits. We dedicate another part of the review to surveying biosensing studies using OPUs, including standard optical drive-based turnkey biosensing, OPU direct bioimaging, and modified OPU-based systems for advanced bioapplications.

Opening the Black Box: The OPU Mechanism

From CDs and DVDs to Blu-ray discs, higher data capacity requires smaller data pits on the same 12-cm-diameter disc, as illustrated in .14 Likewise, higher data density demands shorter laser wavelength λ (CD: 780 nm, DVD: 650 nm, Blu-ray disc: 405 nm) and higher numerical apertures (NAs) of objective lenses (CD: ∼0.5, DVD: ∼0.63, Blu-ray disc: 0.85) to focus the laser on nanoscale data pits (CD: 800 nm, DVD: 400 nm, Blu-ray disc: 150 nm). The OPU focuses a polarized laser to the diffraction limit of light, with full width at half-maximum being approximately 800 nm for CD, 530 nm for DVD, and 250 nm for Blu-ray disc.15 In addition, each data pit has a depth of λ/4, and when the laser hits the pit, the reflection is destructively interfered and the OPU receives a low reflection corresponding to the digital signal “0”, whereas if no pit is hit, the higher intensity reflection is translated as the digital signal “1”.

CD/DVD/Blu-ray disc data pit, pitch, and laser spot dimensions.14

A transparent hard-coat polycarbonate cover layer16 (CD: 1.1 mm, DVD: 0.6 mm, Blu-ray: 0.1 mm in thickness) protects the data pits from being destroyed by scratching and has a refractive index of 1.6. This layer is an essential optical component of the storage system, as its absence could cause spherical aberration, creating an optical path difference which could exceed 0.2 of the light wavelength. Consequently, the optical path difference could reduce in more than 20% the reflected laser intensity.17

illustrates the structure of a typical CD/DVD/Blu-ray OPU.18 A triple-wavelength semiconductor laser diode, its most expensive component, emits a laser beam that is collimated, linearly polarized, and focused on a disc by a collimator, a polarized beam splitter, and an objective lens, respectively. The reflected laser from the disc passes through the same optical path back to an astigmatic lens and impinges onto a photodiode integrated circuit (PDIC).

Diagram of the optical path in a typical triple-wavelength OPU.18

To achieve better signal integrity and lower relative intensity noise, the laser diode is modulated within a frequency from 300 to 500 MHz to mitigate laser coherence.19 Next to the laser diode, a diffraction grating splits the laser into three beams to generate data tracking feedback control signals.20,21 Then, the collimator lens, which is linearly driven by a miniature stepper motor along the laser beam direction, adjusts its position to accurately vary the OPU focal distance. This fine-tuning compensates the effect from both the different disc cover layer thicknesses and the switching target data layers (for single-sided dual-layer DVDs and Blu-ray discs) while reading the disc. The objective lens integrates aspherical and diffractive optical design to focus 780, 650, and 405 nm laser beams to the diffraction limit of light.22 A dichroic filter reflects the laser light to the objective lens, which has reflective coatings for the OPU operation wavelengths. Some OPUs have a clear aperture in the back of the dichroic filter to allow external optical access, despite being preferable to avoid the OPU operation wavelengths. This aperture enables the external coupling of optical components for applications such as optical imaging23 and fluorescence light sensing.24

While reading data pits on a fast-spinning disc, an x-, z-axis and tilt electromagnetic actuator, known as voice coil motor (VCM), allows focusing the laser on the data layer. Three pairs of suspension wires mechanically suspend an objective lens holder and electrically conduct driving signals to the x-, z-axis, and tilt coils inside the holder. The VCM has an operation bandwidth of 20 kHz for moving the objective lens along the z-axis (±1000 μm) for data layer focusing and the x-axis (±350 μm) for following spiral data tracks, whereas tilting (±1°) compensates the data layer angular variation due to disc wobbling. The x- and z-axes usually have a sensitivity of 1 μm/mV to achieve nanoscale resolution with precise diving signals that can be used in various applications.25−27

The PDIC consists of current preamplifiers for photodiodes A to H in (CXA2875GA, Sony Co., Tokyo, Japan), which have an operation bandwidth up to 400 MHz. Given the laser splitting grating, there are three laser spots reflected onto the PDIC, and photodiodes A to H monitor the laser spots and provide signals SA to SH, respectively.

shows the center laser spot shape according to the laser focusing, which is described as an astigmatic method.28 When the laser is focused on an object (z = 0), the laser spot on the PDIC projects a circular shape. When the focal point is off-center, the laser spot projects an elliptical shape with the major axis along photodiodes A–C (SFE > 0) or B–D (SFE < 0). This changing shape can be expressed as focus error signal SFE = (SA + SC) – (SB + SD), which is used to control the VCM for focusing the laser precisely on a target and has been proven to exhibit subatomic resolution for AFM applications.28,29

Focusing detected by astigmatic method. (A) Astigmatic optics inside OPU. (B) Focus error signal SFE according to defocus distance. Reprinted with permission from ref (28). Copyright 2007 AIP Publishing.

OPUs can feature different functions (reading and writing) and sizes (half height, slim type). From our experience, CD/DVD/Blu-ray OPUs can provide flexibility for scientific research given the characteristics shown in Table 1, which summarizes the core components from ten different types of OPUs.

Table 1

Characteristics of Main Components from Different CD/DVD/Blu-ray OPUs

component characteristic type value unit
Objective lens Lens NA CD 0.47–0.53 -
DVD 0.6–0.66
Blu-ray 0.85
  Laser spot size (full width at half-maximum) CD ∼800 nm
DVD ∼530
Blu-ray ∼250
  S-curve linear region CD ∼15 μm
DVD ∼6
Blu-ray ∼0.3
  Working distance (lens to disc) CD 0.55–0.86 mm
DVD 0.63–1.25
Blu-ray 0.27–0.61
Semiconductor laser diode Wavelength CD 770–790 nm
DVD 645–660
Blu-ray 400–410
  Power (Average) CD 160–1130 mW
DVD 170–830
Blu-ray 340–450
VCM Working distance x-axis ±350 μm
z-axis ±1000 μm
Tilt ±1 °
PDIC Operation bandwidth CD 25–90 MHz
DVD 50–130
Blu-ray 110–400

Driving OPUs from Scratch

The easiest way to gain access to the OPU for biosensing is by using an optical disc diagnostic software, which can be downloaded online for free. There are at least four diagnostic software tools: PlexUtilities v 1.3.3 (Plextor, USA), K-Probe2, QpxTool by Gennady Kozlov, and Opti Drive Control by Erik Deppe. PlexUtilities offers more diagnostic tools, whereas Opti Drive Control has enhanced hardware compatibility.30 Furthermore, a Linux-based software allows one to burn and analyze data sectors on the disc.31 This type of software can read logical error correction codes (ECCs) on the disc including detect parity inner errors and parity inner failures, where the former indicate correctable reading/data errors of a logical ECC block on the disc, and the latter determines whether an ECC block contains uncorrectable errors. The Blu-ray utilizes more powerful ECCs which contains long distance code and burst-indicating subcode to protect the data on the disc.32 The ECCs can indicate scratches or polluted parts on the disc surface. We can exploit these features to drive almost every kind of OPU inside optical drives and perform certain biosensing applications as described later.

Inside the CD/DVD optical drives, it is relatively easy to gain access to the OPU. A very efficient method to determine the input/output pin assignment and operating parameters of the OPU laser, PDIC, and VCM is by measuring the voltage and current of each component during operation. Then, the retrieved parameters can be used to drive the OPU for different applications. Unfortunately, it is much more difficult to reverse engineer triple-wavelength OPUs and determine their pin assignment using this method, because most of them have built-in microcontrollers that receive and deliver digital commands for operation.

Supporting Information of this review provides three controller circuit designs with their parameters for the widely available OPUs PHR-803T (Toshiba Co., Tokyo, Japan) inside the XBOX 360 (Microsoft Co., Redmond, WA, USA), KEM 410 with dual objective lens (Play Station 3; Sony Co., Tokyo, Japan), and SF-BC620L (Sanyo Electric Co., Ltd., Osaka, Japan). The customized controllers grant access to all the functions of these OPUs, including CD/DVD/Blu-ray laser switching and power adjustment, modulation frequency control, VCM x-, z-axis and tilt actuation, PDIC filter, gain and modes switching, and miniature stepper motor control.

Recommendations for OPU-Based Applications

It is recommended to keep the cover layer, whose thickness depends on the operation wavelength, in front of the OPU objective lens to guarantee optimal laser focusing. Microscopy cover glasses provide a similar refractive index (1.47 to 1.5) as the cover layer or one can simply use the disc hard-coat polycarbonate cover layer. Furthermore, the cover layer can be used for sealing microfluidic channels. OPU-based imaging or sensing through different media, such as liquid or gas, demands the optimization of the distance between the cover layer and measurement target.33 Moreover, removing the laser splitting grating can increase the laser intensity up to 25% for improved signal-to-noise ratio in sensing applications.

Compared with CD/DVD laser, the Blu-ray 405 nm laser has a focal point of approximately 250 nm, thus being suitable for high-resolution fluorescence imaging. However, the Blu-ray laser may destroy live-cell samples while imaging depending on the dose. Likewise, the Blu-ray phototoxicity might cause plasma membrane permeabilization, cytoskeleton destruction,34 and DNA damage.35 These aspects should be thoroughly considered when using Blu-ray technology for biosensing and imaging.

OPU-Based Biosensing

Turnkey Biosensing

The above-mentioned software tools can turn standard CD/DVD/Blu-ray optical drives into turnkey biosensing instruments.30 Besides custom-made bio-CD for multiplexing DNA microarray detection,36 biomolecular complex assay spots can be inject-printed onto the cover layer of a standard CD.31 Then, a diagnostic analysis of ECCs can be performed while the OPU reads data through the bioassays to quantitatively extract colorimetric characteristics of different assay spots on the cover layer. illustrates the typical ECC-based method for biotin–streptavidin binding, DNA hybridization, and protein–protein interaction sensing.37 In addition, this method can be employed to detect DNAzyme assay at the part-per-billion level.38

(A) Preparation of disc-based bioassay and signal amplification using gold/silver staining. (1) UV/ozone activation to generate carboxylic acid groups on CD surface; (2) immobilization of amino-tethered DNA probe strands via amide coupling; (3) hybridization with biotinylated DNA target strands; (4) binding of gold nanoparticle–streptavidin conjugates; (5) reductive precipitation of silver particles for signal enhancement. (B) Digital reading of bioassay using CD drive. The biomolecule/nanoparticle conjugates block the reading laser and generate errors. (C) Optical image of DNA microarray formed on a regular CD-R according to the above surface reaction and signal amplification. Reprinted with permission from ref (37). Copyright 2008 American Chemical Society.

The ECC-based method has been extended for applications such as onsite pregnancy test,39 multiplexed drug abuse diagnostics,40 heavy metal detection,41 and acute myocardial infarction monitoring.41 Furthermore, Blu-ray optical drives have been shown to increase the resolution and sensitivity for biosensing,42,43 reaching a sensitivity and selectivity comparable to standard enzyme-linked immunosorbent assays.

A professional CD/DVD/Blu-ray disc testing or quality control platform, which is normally used during optical disc production, can be repurposed to monitor on-disc biotin–streptavidin binding at a linear speed of 4.0 m/s. Unlike ECC-based biosensing, such platforms provide an analog reflection intensity signal from the disc.44 Following that approach, a commercially available optical drive can connect the OPU PDIC analog output to a data acquisition device, thus enabling more flexibility for biosensing applications, such as reading on-disc biochemical films to determine Ca2+ concentrations with a detection limit of ±5 ppm,45,46 measuring on-disc multiplexed microimmunoassays (e.g., pesticides, antibiotics),47 detecting Haemagglutinin of influenza virus,48 and sensing RNA aptamers generated against reverse transcriptase interaction.49 Furthermore, the OPU can be extracted from the drive for C-reactive protein measurement with a detection limit of 1 pM.50

Cytometer and Optical Trap

Blood cell count and sizing can provide insightful information during AIDS, sepsis, anemia, and leukemia diagnoses. A conventional CD modified with a polydimethylsiloxane microfluidic channel can be read by a standard optical drive for counting microparticles and living cells and determining concentrations based on ECCs.51 illustrates a conventional and an OPU-based cytometer, which integrates a lab-on-chip device. The OPU-based cytometer has been used to count individual polystyrene beads between yeast cells,52 erythrocytes,53 Chinese hamster ovary,54 and cattle erythrocytes55 by analyzing focus error signal SFE as depicted in .

(A) Conventional optical flow cytometer. (B) Mirror measurement setup using DVD OPU. The laser beam is reflected to the OPU. Reprinted with permission from ref (54). Copyright 2008 Elsevier.

Erythrocytes and beads cause focus error signal SFE to rise and drop, respectively. Consequently, the number of cells or beads can be determined from SFE analysis. (A) OPU SFE readings for erythrocytes (left) and polystyrene beads (right). (B) Histogram of the measurements in (A) considering the minimum and maximum intensities of the peaks. The plot shows two clusters containing erythrocytes at the rightmost region in blue and beads at the leftmost region in green. Reprinted with permission from ref (54). Copyright 2008 Elsevier.

A DVD burner OPU equips a laser with approximate power of 200 mW and can generate tens of piconewtons of force at the focal point. This force is enough to trap colloid or red blood cells.56 Furthermore, the VCM can precisely steer the cells to different channels. This setup has been used to isolate microparticles and red blood cells nondestructively by controlling the OPU with an Arduino board (Arduino LLC, USA) in a gravity-driven microfluid device,57 as shown in .

(A) Arduino board-controlled OPU generates an optical trap that isolates single microparticles inside the microfluidic device and delivers them as free-falling droplets to 96 well plates. (B) Particles flowing into this section follow streamlines into the waste channel, unless translated by the optical trap into the sample channel that leads into a droplet section. Reprinted with permission from ref (57). Copyright 2014 Royal Society of Chemistry.

Direct Bioimaging

The OPU laser focus to the diffraction limit of light has been used as principle for a high-resolution laser scanning microscope to monitor morphological changes in astrocytes and investigate apoptosis triggered by Toxocara canis larval excretory-secretory antigens.58 The OPU-based direct bioimaging system setup is similar to that shown in B, except for the microchannel. The OPU laser focuses on astrocytes incubated on a reflective substrate. Then, the substrate is raster scanned by a piezoelectric scanner while the OPU reads out the focus error signal. The astrocytes can be represented by mapping the focus error array into a grayscale image. shows the images obtained using a conventional high-end optical microscope (A; magnification 1000×, phase contrast mode) and a laser imaging system based on a DVD OPU (B; λ: 650 nm, NA: 0.6). The OPU-based system reveals detailed filament structures of the astrocytes and retrieves a higher contrast than the conventional optical microscope.

Astrocytes imaged by (A) high-end optical microscope in phase contrast mode (contrast: 0.143) and (B) OPU-based laser bioimaging system (contrast: 0.224) Reprinted with permission from ref (58). Copyright 2013 Japan Society for Analytical Chemistry.

Biosensing Using Transducers

Microelectromechanical systems (MEMS) cantilever-based biosensors are traditionally monitored using optical beam deflection,59 which implies a complicated configuration. In contrast, OPUs provide submicron laser spots and subatomic sensing resolution9 to monitor MEMS28,29 and even nanoelectromechanical systems.60 These cantilevers can be functionalized with receptor molecules as label-free biomolecular transducers that are immersed in an analyte and monitored by the OPU61 using static bending and frequency changes,62 as shown in .

(A) SU-8 cantilever bending monitored by a DVD OPU.61 (B) Excited and thermal noise spectrum of a MEMS SU-8 cantilever monitored using the OPU.62 Reprinted with permission from refs (61) and (62). Copyright 2010 Elsevier and 2012 Hindawi, respectively.

In addition, a Blu-ray OPU-based vibrometer combining MEMS resonators inside microfluidic chips has been used to characterize biopolymer degradation under the action of enzymes in a controlled flow condition. An algorithm enables the OPU to measure 12 resonators within 4 min, thus dramatically reducing the degradation measurement time from 6 weeks to 8 h.63

Furthermore, the OPU has a high sensing tolerance of ±5° to the cantilever initial angular tilt, allowing to scan cantilever-based biosensors on a rotating disc. This scanning system has a theoretical throughput of 500,000 cantilevers per second.64 Moreover, the OPU scanning data has been used to reconstruct 3D topography and surface roughness of each cantilever to provide extra physical information for detection of pesticide derivative 2,6-dichlorobenzamide,65 as shown in . OPU cantilever-based biosensing has also been used in applications such as detection of vapor and liquid phase of 2,4-dinitrotoluene,66 platelet derived growth factor proteins,67 and soluble urokinase plasminogen activator receptor inflammatory biomarker.68

(A) Photograph of a DVD platform with integrated cantilever chips. The disc is fabricated from glass and SU-8 polymer. Scanning electron microscope images of gold-coated silicon microcantilevers using three data acquisition modes: (B) deflection, (C) surface 3D reconstruction, and (D) resonant frequency. Reprinted with permission from ref (65). Copyright 2011 Royal Society of Chemistry.

Interestingly, an OPU can be used for nanoscale biomolecule imaging beyond the diffraction limit by monitoring a MEMS AFM probe (A),9,10,28,32 which has a tip with a typical radius of 10 nm. This OPU-based AFM is capable of imaging DNA in air or solution environments,33 as shown in B.

(A) Diagram of OPU-based AFM for bioimaging in liquid environment. (B) DNA sample with approximate height of 1.5 nm on a mica substrate immersed in an aqueous solution. Reprinted with permission from ref (33). Copyright 2013 AIP Publishing.

Modified OPU for Biosensing

A conventional DNA microarray scanner requires microscale precision for xy positioning, laser excitation, precise optics for focusing, and optical sensing. Consequently, the resulting system is expensive and bulky. By replacing the OPU components with a single-mode optical fiber and attaching an external sensing setup, the OPU can be used as the head of a scanning confocal microscope to enable fluorescent-based biosensing.69

shows an OPU-based DNA microarray scanner. The OPU is coupled to a photomultiplier tube (PMT) detector through a dichroic filter, such as that shown in . The OPU–PMT setup can acquire signals from fluorescent dyes excited by the OPU laser of 650 nm.24 The OPU VCM provides dynamic autofocusing that enables higher detection performance than conventional microarray scanners, as shown in . The OPU–PMT-based DNA microarray scanner has been successfully used to measure a commercial bacterial artificial chromosome oligonucleotide DNA chip and a 32 12 Cy5 fluorescent dye calibration slide (DS01).70 Combined with microfluidic chips, OPU–PMT fluorescence detection can measure 2.5 μm fluorescent beads inside a microchannel,71,72 as shown in .

Diagram of OPU–PMT-based DNA microarray scanner. Reprinted with permission from ref (24). Copyright 2007 Springer Nature.

Detection image of a 32 12 Cy5 fluorescent dye calibration slide (A) with and (B) without VCM autofocusing. Reprinted with permission from ref (70). Copyright 2008 Elsevier.

(A) Two-dimensional image of a microchannel cross-section containing multiple 6 μm fluorescent beads. (B) Detection of two 2.5 μm beads within the microchannel. Reprinted with permission from ref (72). Copyright 2012 Royal Society of Chemistry.

To reduce the cost of using triple-wavelength laser diodes, some OPUs are endowed with dual-optics 780 and 650 nm lasers for CD/DVD, and a 405 nm laser for Blu-ray disc reading. These dual-optics OPUs have two objective lenses driven by the same VCM and can perform two separate optical sensing tasks while the objective lenses move synchronously. shows a diagram of a Blu-ray scanning microscope (BSM) comprising a dual-optics OPU coupled with a PMT sensor. The BSM uses the Blu-ray optical path to excite fluorescent light and capture a cell fluorescence image. Simultaneously, the DVD optical path is focused on an address-patterned area to monitor the xy scanning area and z-axis focusing.73 This BSM setup has been successfully used to measure monkey-derived kidney epithelial cells and fibroblast cells stained with fluorophore phalloidin CF405 (Biotum, Inc., Fremont, CA, USA),74 as shown in . Moreover, the compact size of the BSM allows embedding it into a cell culture chamber.

Diagram of BSM. The fluorescence signal passes through multimode fiber B7 and is collimated by collimator lens B8 and narrowband emission filter B9. D1, laser diode; D2, beam splitter; D3, collimator lens; D4, dichroic filter; D5, photodiode; D6, objective lens (NA: 0.6); D7, Al-coated address pattern; B1, blue laser diode; B2, B3, beam splitters; B4, collimator lens; B5, dichroic filter; B6, 4.34 mm focal lens; B10, objective lens (NA: 0.85); B11, lens holder. B12, cover glass; B13, collimator astigmatic plate; B14, photodetector. Reprinted with permission from ref (74). Copyright 2014 The Optical Society.

Fluorescence (A) HA22T/VGH (B) and VERO cell images stained with phalloidin CF405 and Alexa Fluor 488. Collimator lens B4 position of (C) 0, (D) 1, and (E) 2.5 mm. Reprinted with permission from ref (75). Copyright 2015 The Japan Society of Applied Physics.

The Blu-ray objective lens can also be replaced by a 488 nm optimized lens for imaging HA22T/VGH and VERO cell stained with phalloidin CF405 and Alexa Fluor 488 (Thermo Fisher Scientific, Waltham, MA, USA). The imaging depth can be adjusted in a range of ±20 μm through collimator lens B4 () inside the OPU.75 Besides the PMT, the OPU can also equip an avalanche photodiode for Cy5 detection of stained cell fluorescence on a spinning disc.76

Nanoparticle labeling can enhance the biomolecule signals up to 100 times.77 Using this labeling technique, OPUs can scan the DNA microarray with an external photodiode, which is much less expensive than a PMT. shows an OPU–photodiode-based DNA microarray scanner to measure human papillomavirus with Ag-deposited Au nanoparticle labels.78

(A) Diagram for human papillomavirus genotyping microarray preparation. (B) Scanned image and calculated signal-to-noise ratio of human papillomavirus genotyping DNA with low-risk 6, 11, 16, and 18 types. Reprinted with permission from ref (78). Copyright 2014 The Optical Society.

Besides labeling, functionalized magnetic nanoparticle (MNP)-based antigen and antibody assay reactions can be opto-magnetically79 monitored using a Blu-ray OPU (objective lens removed) instead of the expensive and bulky superconducting quantum interference devices.80 Specifically, the Blu-ray OPU–MNP sensing shines a 405 nm parallel laser through a solution contains the MNPs, then acquiring reflection via a mirror. In addition, the Blu-ray OPU PDIC monitors the reflected laser frequency, phase, and amplitude while two coils apply an oscillating magnetic field to the MNPs. Combining Blu-ray OPU–MNP sensing with the lab-on-disc technique can carry out microliter-scale whole blood separation and antibody sensing81 in few minutes ( and ).

(A) Disk for magneto-optical measurements of protein biomarkers in full blood. (B) Platform comprising a motor, modified Blu-ray OPU, magnetic coils, reflection mirror, and customized electronic board for signal extraction. Reprinted with permission from ref (81). Copyright 2014 The Chemical and Biological Microsystems Society.

(A) Detection mechanism of biotinylated IgG (antistreptavidin) antibodies using streptavidin coated 100 nm MNPs. (B) Magneto-optical spectra measured on different pools with varying amount of IgG spiked into blood. Reprinted with permission from ref (81). Copyright 2014 The Chemical and Biological Microsystems Society.

Blu-ray OPU–MNP biosensing has also been applied on Escherichia coli, Proteus mirabilis, Pseudomonas aeruginosa,82,83 NS1 antigen of dengue,84 and adenosine triphosphate.85 This system features a compact size and can be integrated with commercial bioimaging systems to study the aptamer-conjugated MNPs86 and the action mechanism of type 2 diabetes drugs.87

Conclusions and Future Perspectives

CD/DVD/Blu-ray OPUs provide outstanding characteristics such as light weight, low cost, compact size, and high performance, which could be exploited to democratize and spread micro- and nanoscale biotechnology research for institutes in developing countries and citizen scientists. This review shows the possibility to open the black box of commercial OPUs and describes its mechanism, component characteristics, and several OPU-based bioapplications. We place special attention on gaining access to the OPU functions for various biosensing applications, and describe this access using circuits for three commercially available triple-wavelength OPUs in the Supporting Information.

High-speed Internet and solid-state drives have overcome optical drives for digital data transference and storage, with optical disc drives being discontinued from devices such as notebooks. Still, operative optical storage drives can be found in some music players and gaming consoles such as triple-wavelength Blu-ray OPUs are equipped in the Sony’s Play Station 4 (Sony Co., Tokyo, Japan) and XBOX One X (Microsoft Co., Redmond, WA, USA), which are devices that can operate for over 10 years. Moreover, repair assistance for OPUs can guarantee sustained scientific research for years and maybe decades to come.

Optical storage devices have a low cost, high durability, zero-energy storage, and compactness, which helps end users keep their information safe and private from enterprises (e.g., social networks), which can misuse sensitive information, and avoid big data cloud storage. Moreover, the femtosecond laser-based 360 TB with 13.8-billion-year storage time data recording technique proposed in ref (88) suggests an exciting future for optical storage technology. Of course, successful engineering, commercialization, and mass production processes will determine the future of this technology and reduce the costs for potential applications in further scientific research.

Acknowledgments

The authors would like to thank Mr. Chung-Hsiang Cheng and Mr. Christian Werner for the OPU driving circuits design. The authors also acknowledge the support from the European Research Council under the European Union’s Seventh Framework Program (FP7/2007-2013), Grant no. 320535-HERMES and Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN) (grant no. DNRF122) funded by the Danish National Research Foundation and the Velux Foundations.

Glossary

Vocabulary

numerical aperture a range of angles over which a lens can emit or collect light
refractive index a dimensionless number of a material which describes speed of light propagates through the material
voice coil motor an actuator driven by an electric current energized copper coil that operates inside a magnetic field
optical path difference rays emitted from a point traveling through media with different ray path length
dichroic filter color filter that selectively reflect certain light wavelengths
photodiode a semiconductor-based component to convert light into an electrical signal
error correction code sequence of numbers that corrects errors during data transmission

Author Contributions

The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript.

Notes

The authors declare no competing financial interest.

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