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Two device geometries that enable structural coexistence are micro-mechanical and optical resonators. In one geometry, a micro-cantilever mechanical resonator also functions as a mirror in a high-finesse optical cavity. In a second, opto-mechanical coexistence takes the form of a micron-scale silica toroid that exhibits both high-Q radio-frequency mechanical resonances and optical resonances.
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.
Optically thin terahertz metamaterials made from Pb split-ring resonators are investigated. The LC resonance emerges at a critical metal thickness near 0.15 skin depth and exhibits a characteristic evolution with increasing thicknesses at sub-skin-depth level.
We introduce a simple procedure for high-Q cavity design in photonic crystal heterostructures. The key parameter in the optimization process is the relative position of the resonant frequency within the mode-gap.
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.
Cascaded over- and under-coupled resonators (COUR) result in slow light followed by fast light. COUR can be used as a notch filter and phase modulator that overcomes the trade-offs of extinction-ratio-group-delay and sensitivity-bandwidth.
We demonstrate a pair of strongly-coupled, stacked monolithic silicon nitride microdisk resonators coupled to a tapered optical fiber. High-frequency optomechanical interactions between the two microdisks are induced by both optical force and photothermal effects.
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 demonstrate silicon photonic wire evanescent field sensors formed by folding long photonic wire waveguides into dense spiral paths that occupy spot sizes less than 150 mum in diameter, and are hence suitable for biochip array formats. These sensors are incorporated into both ring resonator and Mach-Zehnder interferometer (MZI) interrogation circuits, and tested by monitoring streptavidin protein...
We present the first demonstration of ultra-low power four-wave-mixing in a high-index glass micro-ring resonator (47.5 mum radius). By using a mW-level CW pump power we obtained an appreciable wavelength conversion in the C-band.
We investigate the limitations of using THz metamaterials as thin-film chem-bio sensors, by depositing dielectric overlayers onto split-ring resonator arrays. We also study resonance shifts by conjugating biomolecules using avidin/silane linkers attached to the resonators.
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 measured second harmonic generation in the whispering gallery modes of a microspherical cavity from a monolayer of nonlinear molecules on the sphere surface. Such monolayer is placed with the appropriate configuration for phase matching.
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.
Quasi-TM-mode propagation loss of 1.83 dB/cm at lambda = 1.565 mum is achieved in horizontal Si(amorphous)-SiO2-Si(crystalline) slot waveguides with 8.3 nm slots fabricated on silicon-on-insulator. Waveguide loss is measured using a ring resonator with Q ~ 3x105.
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