Electrical and Electronic Engineering - Research Publications
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ItemHigh-resolution mid-infrared spectral reconstruction using a subwavelength coaxial aperture array(OSA & IEEE, 2019-01-01)We demonstrate mid-infrared computational spectroscopy using an array of coaxial aperture filters. We experimentally determine material transmission spectra using an algorithm whose inputs are the transmission spectra and the power transmitted through each filter.
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ItemMachine learning design of plasmonic apertures for optical nanotweezers(OSA, 2019-01-01)We present a new approach to design plasmonic structures for optical trapping. Using a simulated annealing algorithm, the shape of a nanoaperture is optimized. An order of magnitude increase in trapping potential is predicted.
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ItemNanostructured all-Silicon Photodetector Pixels with Tailored Responsivity Spectra(SPIE-INT SOC OPTICAL ENGINEERING, 2019)We experimentally demonstrate nanostructured silicon photodetectors which consist of subwavelength arrays of verticallyoriented waveguides etched into a P-I-N photodiode. Our device combines both spectral-filtering and photocurrentgeneration in one all-Si structure. We show that absorption and responsivity spectra of these nanophotonic devices can be tuned by appropriate geometric design.
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ItemVertically stacked silicon nanowire photodetectors for spectral reconstruction(OSA & IEEE, 2019-01-01)We experimentally demonstrate the use of vertically stacked silicon nanowire photodetectors for computational spectral reconstruction at visible wavelengths. The method is based on the photodetectors having tailored responsivity spectra, achieved by standard nanofabrication processes.
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ItemVertical waveguide arrays as wavelength selective nanostructured silicon photodetector pixels(OSA, 2019)We experimentally demonstrate a nanostructured silicon photodetector that consists of subwavelength arrays of vertical waveguides. Our device combines spectral-filtering and photocurrent-generation. We show that absorption and responsivity spectra can be tuned by appropriate design.
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ItemAlgorithmic Spectral Reconstruction Using Angularly Tuned Zero-Contrast Gratings(IEEE, 2020)We experimentally demonstrate the algorithmic reconstruction of the infrared transmission spectrum of a polymer using a zero-contrast waveguide-grating metasurface as a filter. By changing the metasurface angle, a variety of filter functions are obtained.
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ItemGeometric Phase Metasurface Hologram for Optical Tractor Beam Generation(OSA & IEEE, 2020-01-01)We present a geometric phase silicon metasurface hologram design intended to produce a non-diffracting solenoid beam. Such optical beams have been shown to exert long range retrograde (i.e. toward source) optical forces on light-scattering particles.
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ItemPolarization State Generation and Detection by VCSELs with Integrated Metasurfaces(OSA & IEEE, 2020-01-01)We experimentally demonstrate vertical-cavity surface-emitting lasers (VCSEL) with integrated plasmonic and dielectric metasurfaces. The metasurfaces shape the polarization of the laser emission from the VCSELs and also enable them to serve as polarization-dependent photodetectors.
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ItemSmartphone-based Optical Fiber Speckle Spectrometer(IEEE, 2020)We demonstrate a spectrometer that uses a smaityhone to image the speckle pattern produced by a multimode optical fiber. A smarjihone-based algorithm uses the measured pattern and a calibration library to determine the input spectnrm.