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Ultra-high Q (>5 times 105) microdisk resonators are demonstrated in a SiNx platform at 650 nm with integrated in-plane coupling waveguides on a Si substrate. Critical coupling to first-order radial-mode is demonstrated using pedestal layer to control coupling.
We integrated into GaN LEDs both two-dimensional photonic crystal patterns and angled sidewall deflectors. The resultant devices exhibited about three-fold enhancement in vertical emission intensity when compared with the planar reference LED device.
We propose two-dimensional nonblocking low-power photonic switch nodes for networks-on-chip using multimode-interference-based waveguide crossing-coupled microring electro-optic switch array in silicon-on-insulator.
Scheme to realize controlled phase gate through single quantum dot in slow-light silicon photonic crystal waveguide is proposed. Enhanced Purcell factor and beta-factor lead to high gate fidelity over broadband frequencies compared to cavity-assisted system.
A technique to fill semiconductors inside a microstructured optical fiber is developed. The structural, electrical and optical properties are investigated. All-optical modulation of light and an in-fiber field effect transistor are demonstrated using this device.
We present three spin-dependent optoelectronic devices for spin controlled photonics working at room temperature. A spin controlled light emitting diode is demonstrated which exhibits spin injection through Fe/Tb-multilayers at room temperature and in remanence. Furthermore, we show that a classical vertical resonator laser can amplify spin information even at room temperature due to its nonlinearity...
The development of integrated polarization manipulating devices opens the perspective on the use of polarization as a new design dimension in InP-based integrated optics. Examples will be given of how this results in additional functionalities.
We demonstrate on-chip absorption spectroscopy using silicon microring resonators with integrated microfluidic channels. Using a 40 mum radius resonator with Q>15,000 we show absorption spectra of less than 90 nL volumes of water and methanol from 1460 nm-1560 nm.
We present the nanofabrication of sub-wavelength grating using ultra-fine nano-machining process. We successfully demonstrate the nano-machining fabrication of 20 nm grating pitch for nano-structured photonic devices, which is also used for thermal nano-imprint mold.
We report optical experimental frequency division and chaos results in a resonant tunneling diode laser diode driver configuration that forms a self-oscillating circuit. Circuit behavior and laser output results are well predicted using Lienardpsilas equation.
Deterministic integration of site-controlled InGaAs/GaAs quantum dots (QDs) with photonic crystal cavities is demonstrated. Fine adjustment of QD position (within ~10 nm) and emission energy (few meV) allows construction of coupled QD systems.
We show cascaded silicon microring resonators with 1.5-mum radius critically coupled to a narrower waveguide. A coupled Q of 9,000 is achieved. Devices are fabricated with the widely-available SEM-based lithography system using a stitching-free design.
We demonstrate ultra-low-power parametric frequency conversion of 5-Gbit/s data in a silicon photonic structure via microcavity-enhanced four-wave mixing. Our modeling predicts high conversion efficiency up to 0-dB is possible through GVD-engineering and free-carrier lifetime reduction.
We theoretically demonstrate secure signal transfer by optical excitations involving optical near-field interactions. The energy dissipation processes, occurred locally in the nanometer-scale associated with exciton-phonon interactions, guarantees higher tamper resistance than conventional wired devices.
A SPR biosensor array based on optoelectronic platform has been developed. Using integrated photodetector, the SPR signal has been directly converted into electrical signal and the device has the potential of high throughput measurement capabilities.
We propose ultra-small silicon microring-based pulse carvers operated at 10 Gb/s. RZ-DPSK transmitter is obtained in chip-size of only tens of mum2 and exhibits lower power-penalty than MZM-based one by 1.7 dB in data transmission.
We demonstrate ultra fast tuning of the optical quality factor of a resonator on a silicon chip using electro-optic tuning. We tune the cavity quality factor from 20,000 to 6,000 in 100 ps.
A novel electro-optic microwave-lightwave converter using antenna-coupled modulation electrodes and polarization-reversed structures is proposed. It can convert several wireless signals coming from different directions to different optical signals respectively. Basic operations at 15 GHz were presented.
We report the first high-current photodiode based on the slab-coupled optical waveguide concept. The device has a large mode (5.8 times 7.6 mum) and ultra-low optical confinement (Gamma ~ 0.05%), allowing a 2-mm absorption length. The maximum photocurrent obtained was 250 mA (R = 0.8-A/W) at 1.55 mum.
We report the first observation of Anderson light localization in compact silicon nanophotonic slow-light waveguides consisting of long sequences of coupled resonators fabricated on a silicon-on-insulator (SOI) chip.
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