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We demonstrate critically coupled silicon microring resonators with intrinsic Q close to 300,000 and mode volume Vap20times(lambda/ne)3. For sub-mW optical power, large pump induced resonance shifts were observed for applications in all-optical switching.
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.
A novel refractometric sensor based on an embedded optical microfiber loop resonator is presented. The device sensitivity has been studied in two typical configurations and its dependence on the nanowire diameter and coating thickness determined.
We experimentally demonstrated a novel refractometric sensor based on a coated optical microfiber coil resonator which is robust, compact, and comprises an intrinsic fluidic channel. The measured sensitivity has an excellent agreement with theoretical predictions.
We demonstrate a bowtie geometry in a silicon planar resonator with an ultra-small modal volume .01(lambda/2n)3. Bowtie, ring resonators and 1D and 2D photonic crystal resonators are compared for tradeoffs in confinement and quality factors.
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.
We report double-notch-shaped microdisk resonators for silicon nonlinear-optic applications with direct in/out coupling via the microdisk notches. We measure optical bistability and resonance wavelength redshifts induced by the notch-coupled pump light.
We demonstrate superluminal pulse propagation on a silicon chip using an all -optical analog to electromagnetically induced absorption created by the coherent interaction between two micro-resonators. We show group indices tunable between -1158 and -312.
We fabricate horizontal slot waveguides and resonators using layers of polycrystalline and single crystalline silicon. We demonstrate waveguide propagation losses of 7.3 dB/cm and ring resonators with an intrinsic quality factor of 76,000.
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.
A pulse delay corresponding to a slow group velocity of ~0.008 c was observed in a low-loss coupled cavity waveguide formed by 60 photonic crystal nanocavities whose intrinsic Q was as high as 106.
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 resonator based on embedded rings may find important applications as novel ultra-small filter, modulator and delay element. It exhibits 10 times higher delay and potential for high-speed modulation.
We propose the combination of a planar optical resonator and a solid immersion lens for resonantly enhanced non-contact near-field lithography. Subwavelength small spots can be produced by exciting the Bessel modes of the resonator.
Thermal tuning with an efficiency of 40 muW/GHz/ring is demonstrated in silicon-rich silicon nitride second-order microring resonators. Open-loop thermal stability of the resonant frequency is measured to be within 400 MHz for these resonators.
We present a novel high-Q resonator using high contrast subwavelength grating. The simulated Q-factor of the resonator can be as high as ~500,000. A Q-factor of 14,000 is experimentally measured in fabricated devices.
We theoretically and experimentally demonstrate a compact silicon photonic crystal microcavity sensor capable of detecting in vivo a single particle of size comparable to a virus.
We report on the fabrication and investigation of pyramidal GaAs micro-cavities on top of a Bragg mirror. A finite-difference time-domain simulation supports the experimentally found optical mode structure for such a cavity shape.
Silicon-on-insulator (SOI) finite-size CROWs with optimized flat-band spectrum, excellent group-delay response, and compact size are experimentally demonstrated using direct correspondence with ladder-type LC circuits. Sensitivity analysis attributes residual distortions to non-ideal fabrication rather than coupling-induced-frequency-shifts.
We demonstrate a robust double-capillary microfluidic ring resonator optical sensor imbedded into a solid polymer matrix. The device is capable of compensating the temperature and pressure variations and can be generalized to a multi-capillary lab-on-a-chip.
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