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Strong direct gap light emission is obtained from germanium-on-insulator (GOI) with tensile strain of 0.16% and ultra-high n-type doping concentration up to 1.0×1020 cm−3. Microdisk resonators are also fabricated on GOI and show modulated emission spectra.
Single femtosecond laser pulses are used to modify the surface of c-Si waveguides clad by SiO2 for permanent tuning of microring resonators. Positive, controllable resonance shifts that vary with fluence are demonstrated, inducing little loss.
We propose an enhanced mid-to-near-infrared second harmonic generation (SHG) process relying on a silicon plasmonic microring resonator. The SHG efficiency is enhanced by two orders of magnitude compared to previous results.
A tunable interior-ridge microring filter is demonstrated with a high quality factor of 1.5×105, while achieving a thermal tuning efficiency of 5.5µW/GHz. The filter demonstrates a record low insertion-loss <0.05dB over an uncorrupted 4-THz free-spectral-range.
We investigate polarization cross-coupling between modes of microring resonators and waveguides due to structural asymmetries. We experimentally demonstrate the coupling between a double-layer SOI waveguide fundamental TM mode and microring higher-order radial TE modes.
We present mechanically-tunable microdisk resonators using electrostatic actuation in double-layer-SOI material platform. The possibility of achieving resonance wavelength shifts as-high-as 5.5 nm/volt and 1.35 nm/nm over a wavelength tuning range of 35 nm is demonstrated.
We demonstrate compact silicon microring resonators suspended in air with ultra-high optical quality, achieving an intrinsic quality factor of 9.2×105 in the telecom band for the resonator with a radius of 9 µm.
We propose and experimentally demonstrate a compact wavelength blocker implemented by silicon micoring resonator (MRR) with nested pair of subrings, which can perform selective channel-blocking at certain resonances of the MRR without affecting the others.
We present the design of a 40 Gb/s reconfigurable logic unit based on all-optical switching by two-photon absorption induced free-carrier injection in silicon add-drop microring resonators. The circuit has been theoretically analyzed using time-domain coupled-mode theory.
We present a novel label-free bio-photonic sensing system based on silicon opto-electric integrated circuit (OEIC) platform. The sensing system comprises an electrical-tracing assisted microring and a sensor microring integrating with an on-chip photodetector for direct electrical read-out. Multiplexing is achieved through an array of microrings and integrated photodetectors. Such sensing system circumvents...
We report on high-performance compact, micro-ring resonator based silicon photonic filters, which can show comparable performance, in some metrics, to much larger, bulk-optical filters.
We investigate the photo-excitation of localized surface plasmon polaritons (LSPPs) in semiconductor structures at THz frequencies by the optical pumping of electrons across the semiconductor energy bandgap. This excitation can be actuated in picosecond time scales, enabling ultrafast THz plasmonics. The concept of active plasmonics can be extended to a full spatial and temporal optical control of...
Simultaneous polarization demultiplexing and demodulation of PolMux-DPSK signals is demonstrated using a polarization splitter and rotator together with a single microring resonator on a silicon chip. System experimental results validate the concept.
We have designed, fabricated, and characterized cascaded ring resonator on silicon on insulator, SOI, chips. This resonator configuration allows for simultaneously gathering multi-parametric information on gaseous/fluidic solutions in contact with sensors, without requiring molecular labeling.
We present an ultra-compact optical diode using nonlinear second-order silicon microring resonator which is complementary metal-oxide semiconductor (CMOS) compatible. The designed optical diode features high isolation (>20 dB) and more tolerant resonance wavelength mismatch (+/−0.35 nm with <1.5 dB isolation degradation).
We report microresonators with the highest Q on a double-layer SOI material platform developed using wafer bonding. We also demonstrate 2 µm radius resonators with Q's>20k which are the most compact resonators on such platforms.
We experimentally demonstrate an accurate post-fabrication trimming technique for the correction of the optical phase of silicon photonic devices using a single fabrication step. Using this technique, we reduce the random resonance wavelength variation of ultra-compact silicon resonators by a factor of 6 to below 50 pm.
Devices fabricated on 4 µm thick SOI wafers are presented. They include a router based on AWGs and SOAs, a demultiplexer based on cascaded MZIs, ring resonators, and a novel concept of MMI resonator.
A comprehensive investigation of silicon microring sensor, which is used for temperature detection, is reported in this paper, and the theory was introduced in detail. Numerical analysis shows that the silicon microring has a high sensitivity and a very good linearity between real-time temperature and effective index. By optimizing the parameters, the microring sensor can obtain a higher sensitivity...
We propose a method to detect nanomechanical variations in the three dimensional space with a shoulder-coupled pillar-inserted aslant photonic crystal nanocavity resonator. FEM and 3D-FDTD simulation software are employed to investigate the sensing characteristics. With high quality factor of the aslant nanocavity and the optimized structure, high sensitivity of nanomechanical sensing can be achieved...
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