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Virtual contrast enhancement allows a high speed illumination sequence set optimization for high precision measurement tasks. Therefore an FPGA controls the illumination and processes a captured image stack inside the camera.
The emerging field of compressed sensing (CS, also referred to as compressive sampling)1, 2 has potentially powerful implications for the design of optical imaging devices. In particular, compressed sensing theory suggests that one can recover a scene at a higher resolution than is dictated by the pitch of the focal plane array. This rather remarkable result comes with some important caveats however,...
X-cut LiNbO3 microwave-lightwave converters using patch-antennas with a narrow-gap are proposed for direct wireless to optical conversion. Conversion efficiency of the proposed devices was improved by 6dB for 26GHz bands compared with z-cut LiTaO3 devices.
A fabrication technique using dielectrophoresis is demonstrated to align semiconducting single-walled carbon nanotubes (s-SWCNTs) and improve electronic devices performance. The proposed method produces highly dense aligned nanotubes (>40 s-SWCNTs/µm) and low sheet resistance (<10 KΩ/□).
High repetition rate frequency combs and pulse trains are generated from continuous-wave lasers either by strong electro-optic modulation or by nonlinear wave mixing in microresonators. Applications to optical and RF arbitrary waveform generation and signal processing are discussed.
The proposed pixel circuit for active-matrix organic light-emitting diode display compensates threshold-voltage-shift (ΔVth) of drive TFT by utilizing ΔVth-dependent charge transfer caused by a TFT-based Metal-Insulator-Semiconductor (MIS) capacitor. Its effectiveness is verified by simulation results.
An electrically driven photonic-crystal nanocavity laser with a buried heterostructure exhibits a record low threshold current of 14 µA at 25°C. High-temperature operation up to 95°C is achieved by using the InGaAlAs-based multiple-quantum-well active region.
Colloidal semiconductor quantum dots (QDs) have been extensively explored for numerous applications ranging from optoelectronics to biotechnology. This strong demand for the colloidal QDs arises because of their favorable optical and electronic properties. From the application points of view, QDs typically need to be used in their solid form, as opposed to their as-synthesized dispersion form. For...
Semiconductor nanowire offers numerous opportunities for electronic and photonic technology such as nanowire laser and Field Effect Transistor. This study suggests a new method for manipulation of ZnO nanowire using thermoplastic and tapered optical fiber.
Plasmonic color filters and polarizers were produced using nanotransfer printing to create aluminium nanostructures, as small as 75nm, on a polycarbonate sheet measuring 10mm × 12mm. Plasmonic filters showed good agreement with simulations.
Thin-film crystalline silicon photodiodes with the highest uncooled responsivity to dark current density ratio (0.30–0.54 cm2/nW for λ= 470 nm–600 nm) reported to date are described herein for integrated biomedical imaging and biochemical sensing.
The NdF3 thin film grown at 670 K exhibited the maximum photocurrent and the response below 180 nm in sensitivity spectrum. Moreover, the increase in current achieved 4-digit growth before and after VUV illumination. These observed characteristics open up the possibility of high sensitive VUV photoconductive detectors using fluorides.
The generation of ultrashort optical pulses by semiconductor lasers has been extensively studied for many years. A number of methods, including gain-/Q-switching and different types of mode locking, have been exploited for the generation of picosecond and sub-picosecond pulses [1]. However, the shortest pulses produced by diode lasers are still much longer and weaker than those that are generated...
We review our recent experimental progress regarding optical metamaterials and transformation optics. The emphasis lies on three-dimensional architectures including invisibility cloaks and potential applications such as broadband circular polarizers and metamaterial metal-based bolometers.
We present our recent development of fiber-optic technology for all-optical switching and routing of entangled photons at high speeds, with minimal loss and added in-band noise, and—most importantly—without disturbing the photons' quantum state.
We are presenting the development of a nonlinear diffusion model to aid the design and fabrication of annealed proton-exchanged (APE) channel waveguides in zirconium-doped lithium niobate (Zr:LiNbO3 or Zr:LN). This work follows research at Stanford by Bortz [1, 8] and Roussev [2], who developed nonlinear diffusion models for congruently melting LiNbO3 (CLN).
Semiconductors with a high optical nonlinearity, e.g., silicon, which can be lithographically patterned into nanophotonic waveguides or micro-resonators, may lead to on-chip room-temperature telecommunications-band quantum light sources for complex and scalable systems.
A 22 GHz AlInGaAs two-section mode-locked laser is presented here. 860 fs optical pulses with timing jitter of 280 fs (1 Hz–100 MHz) are generated by direct RF modulation of the saturable absorber.
Modified uni-traveling carrier (MUTC) photodiodes with diameter of 28 µm and 20 µm flip-chip bonded on AlN substrate demonstrated RF output power of 25 dBm and 19 dBm at 25 GHz and 30 GHz, respectively.
Optical frequency combs generated by electro-optic modulation form a coherent multi-carrier light source for flexible microwave photonic filtering. Various filter experiments demonstrating high sidelobe suppression, deep submicrosecond tuning, and pulse compression capability are described.
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