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We demonstrate preliminary results from a monolithically integrated tunable laser with narrow-linewidth. Experimental results show tuning in excess of 54 nm in the O-band as well as significant reduction in laser linewidth due to the external cavity. The measured linewidth with external cavity, currently limited by measurement setup, is around 150 kHz.
We demonstrate here the peak-dragging phenomenon in a nanobeam photonic crystal cavity with low optical power thresholds. In our device, Joule-heating mechanism enhances the absorption-induced heat by collecting the generated photocarries in a reverse-biased pn-junction.
Upconversion detection can isolate the temporal and wavelength window over which light can be efficiency received. Using appropriate designs the ability of an eavesdropper to damage, measure, or control QKD receiver components is significantly constricted.
Linear and coherent non-linear resonant high resolution laser spectroscopy was used to characterize In0.54Ga0.46N disks in nanowires. Nonlinear optical spectroscopy and PLE reveal narrow excitonic resonances and evidence of coupling between separate excited states.
We study the half-field subband-Landau resonant splitting of a two-dimensional electron gas and demonstrate the possibility to tune the intersubband spacings via density-chopped far-infrared transmission spectroscopy in the absence of external magnetic field.
Optical trapping by using bowtie antennas deposited on top of a microfluidic SiN trench waveguide is investigated. We show that the presence of plasmonic field enhancement boosts the vertical trapping force by 3 orders of magnitude.
Anisotropic 2D diffraction orders were observed in indium tin oxide (ITO) coated 1.0mm thick iron-doped lithium noibate (Fe:LN) slabs, which can be satisfactorily by visible excitation of surface plasmon polaritons near ITO/LN interface that was greatly modified by pyroelectric (PY) and bulk photovoltaic (BPV) effects.
We theoretically analyze a nonlinear optofluidic process produced by radiation pressure of a high quality factor whispering gallery mode in a liquid droplet. Using liquid properties that are experimentally attainable, we find that such a process may lead to photon-photon interaction at single photon energy level.
In this work, the on-chip quantum interference of two single surface plasmons was achieved and the high visibility (greater than 90%) proves the bosonic nature of single plasmons. The effect of intrinsic losses in plasmonic waveguides is also discussed.
We investigate a one-dimensional system consisting of a graphene monolayer sandwiched between two aperiodic multilayer structures. We show that such a system can achieve near total resonant light absorption in graphene at multiple tunable wavelengths.
We investigate a new class of quasi-aperiodic nanorod structures for emission enhancement. Using inverse design we identify one optimized structure which produces a 1.48X.
Triple thin metal-film subwavelength gratings on both sides of a silicon substrate are fabricated for polarizers in the mid-infrared wavelength region of 10–20 μm. Measured TE-wave losses are higher than 30dB for the wavelength range, while the TM-wave losses are lower than 2.0dB in the wavelength range of 16.5–19.5μm.
We provide an optical heterodyne detection configuration based on an all-fiber acousto-optic structure, which acts as both frequency shifter and coupler simultaneously, with a resolution of 0.01 nm from 10 kHz to 90 kHz.
We design, fabricate and experimentally demonstrate a novel generic method to detect flow rates velocity in microfluidic devices. The method is appealing for variety of applications where a simple and accurate speed measurement is needed.
Signals measured with Chirped Laser Dispersion Spectroscopy setup implemented with intensity modulator are analyzed experimentally. Potential strategies for signal retrieval and amplitude enhancement possibilities are described.
The idler output of an ultrafast optical parametric oscillator is used with a mid-infrared camera to distinguish between water and deuterium oxide, demonstrating the potential for standoff detection of a wide range of liquids.
Off-axis far-field coupling of a broad-area laser to a single-mode fiber containing a fiber Bragg grating is used for spatio-spectral filtering. This results in a ∼10x narrower spectral width and potential spatial brightness improvements.
A time-to-frequency converter based on a modified time lens is proposed and demonstrated experimentally. Return-to-zero pulse with a duty cycle of 33 % and 67 % are both accurately mapped into the spectral domain.
We present the modeling of a laterally coupled twin-stripe laser for boosting the modulation bandwidth far beyond relaxation frequencies. The 3dB-modulation bandwidth is increased to be doubled thanks to optical feedback in laterally coupled cavities.
Reported here is a method for trimming the resonant frequency of microring resonators by permanent thermal modification of a waveguide cladding. This method would use in-situ heaters, avoiding the need for highly specialized equipment.
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