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We report on monolithic 4×20 silicon photonic MEMS switches capable of multicast functions. The switch has small footprint (1.2×4.5mm2), low optical insertion loss (<4.0dB), fast switching (9.6μs). 1×2 and 1×4 multicasts were successfully demonstrated.
We present techniques for measuring the damage performance of a variety of optical components with ps laser pulses, introduce a novel beam diagnostic technique, and explore the sensitivity of damage resistance to laser spot size for the case of high-reflectivity, multilayer dielectric (MLD) mirrors.
We report on a record 2% extracted optical-to-terahertz conversion efficiency in the mm-wavelength range through optical rectification in cryogenically-cooled lithium niobate by exploiting spatial and temporal shaping of the optical pump beam.
We demonstrate ultrahigh-speed spectral shaping of broadband laser pulses to create structured illumination of a high-speed flow for compressive microscopy. We achieve up to 39.6 gigapixel/s continuous imaging rates using a 720-MHz ADC sampling rate.
The linewidth of dispersion-tuned fiber laser was improved by pulse modulation. The laser was applied to swept-source optical coherence tomography system and images with deeper imaging range were obtained.
We present a novel all-optical light tracker by taking advantage of the nonlinear optomechanical signal amplification and modulation, which can transfer the information carried by a signal light to tracking light without electro-optical converting.
We demonstrate 6dB improvement in phase noise of a mode-locked semiconductor laser using coherent photon seeding, achieving a record linewidth of 29kHz. The complete photonic-circuit including the feedback cavity is integrated on a single chip.
We measured the membrane roughness of neuroblastoma cells under the treatments of gold nanoparticles and paclitaxel. The stabilization of microtubules by paclitaxel reduced the membrane roughness. The positive charges on nanoparticles led to similar results.
We demonstrate the reduction of phase noise 10 dB below the thermomechanical noise limit of individual oscillators in arrays up to seven synchronized self-sustaining optomechanical oscillators.
We report on the initial results of the first automated classifier to distinguish basal cell carcinomas and healthy skin using polarization sensitive optical coherence tomography (PS-OCT) with a sensitivity and specificity of 84.2% and 85.8%.
We explore light diffraction by parity-time-symmetric metasurfaces. Such structures can lead to one-sided diffraction when operating close to their exceptional points. In this regime, the negative diffraction orders are eliminated while the positive are enhanced.
Abrupt transitions in the scattering response of parity-time (PT)-symmetric nanoparticles is discussed. Based on the closed-form analytical solution of a complex scattering problem, we show that material imbalance can generate strong absorbing or amplifying scattering states above PT threshold.
We demonstrate the first long-wave, room temperature II-VI materials based Quantum Cascade emitter around 7.2 μm. At 80 K, a device differential resistance of 2.6 Ω and a narrow electroluminescent width of 16% was obtained.
We demonstrate femto- and picosecond laser assisted nanostructuring of hydrogenated amorphous silicon (a-Si:H). The laser-induced periodic sub-wavelength structures exhibit the dichroism and giant form birefringence giving extra dimensions to the polarization sensitive image recording.
We differentiate the spacer-dependent peak shift in coupled and decoupled super absorbing metasurfaces based on magnetic resonance and interference mechanism, respectively, which was experimentally validated by low-cost structures fabricated by lithography-free processes.
Although the genomes of many animals, from worms to humans, have been sequenced, much of the detailed molecular understanding of the biology of these genes and their proteins is unknown. One of the major problems is that we cannot currently see what a protein does, where it is, and how it moves. Thus, most functional conclusions about a protein are necessarily indirect. The visualization of the structure...
Degenerate Bragg matching with a volume hologram can lead to reduction in image contrast. Incorporating very high selectivity holograms, high numerical aperture objectives, and image processing can provide image information comparable with histology stained images.
High resolution, full-field tomograms are acquired in four exposures of a CCD camera using a swept laser. The imaged depth is selected by modulating the swept laser output power enabling volumetric imaging with no moving parts.
Using time of flight we have enabled an optical brush to calibrate itself and image with its randomly positioned fibers, this offers a flexible field of view and is intrinsically multi-spectral. Therefore, it has potential application for endoscopy, imaging in turbid media and near-field probing.
We report a III-V-on-SOI vertical-cavity laser emitting into an in-plane Si waveguide fabricated by using CMOS-compatible processes. The fabricated laser operates at 1.54 μm with a SMSR of 33 dB and a low threshold.
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