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Functionalized silicon nitride waveguides are used to detect Raman scattering from trace concentrations of vapor phase chemicals. Parts-per-billion detection limits are measured using single-mode rib and nanoslot waveguides pumped at 785 nm.
The vapor-phase Raman spectra of trace concentrations of chemicals are measured using highly evanescent silicon nitride rib waveguides functionalized with a top cladding that is designed to strongly sorb organophosphonates and other toxic species.
We demonstrate an opto-electro-mechanical phase shifter. A suspended microbridge is electrostatically actuated to strongly-interact with a weakly-confined waveguide mode. The resulting effective index tuning substantially exceeds that achievable with thermo-optic and electro-optic approaches.
We experimentally demonstrate mid-infrared difference frequency generation in suspended 181-nmthick GaAs waveguides. The extreme form-birefringence in the nanoslab waveguide enables phase-matching between the CW signal (1550 nm), pump (1025 nm), and idler (3000 nm).
We experimentally demonstrate cascaded microcavities for enhanced bandwidth and extinction. The cavities are integrated into waveguides by etching three sets of quarter-wavelength trenches, each set forming a reflector. Experiments compare well with transfer matrix predictions.
We detect trace gases at ppb levels using evanescent-field absorption spectroscopy in microring resonators coated with sorbent polymers. The overtone spectra derive from mid-infrared resonances that provide a signature of analyte toxicity.
We demonstrate Vπ L values in the optical L-band in suspended quantum well waveguides between 109 and 199 mV-cm, which result from the strong out-of-plane index contrast that tightly confines the mode to the quantum well core.
We demonstrate the detection of water vapor adsorbed into a sorbent polymer layer coated onto highly evanescent SiN rib waveguides by measuring the change in absorption as a function of wavelength, polarization, and analyte concentration.
We design cascaded waveguide microcavities. Using realistic design parameters based on previously demonstrated single-stage devices, we model filters with >60dB extinction, 100GHz FSR and 1GHz bandwidth. Initial experimental results are presented.
We experimentally demonstrate and explain phonon “lasing” (“PhASER”) in a photo-pumped micromechanical cavity that exhibits all the characteristic of a standard laser near threshold and is described by the standard laser equations.
We measure and theoretically describe the polarization anisotropy of the facet reflectivity in rectangular, subwavelength waveguides. This effect is increasingly impacting the performance of integrated optical devices as the lateral size scale shrinks.
We demonstrate a new add-drop filter architecture combining an asymmetric Y-branch mode conversion waveguide and a high index contrast shifted grating mode-conversion cavity. Measurements show add-drop functionality in a linear Fabry-Perot filter.
We experimentally demonstrate an InP-based microelectromechanically tunable asymmetric Fabry-Perot quantum well modulator that operates in the optical C-band. The device exhibits contrast ratios over 20 (13 dB) with less than 8 volts bias.
A resonator defined by mode-converting gratings in a waveguide is proposed This resonator can exhibit narrow resonances similar to Fabry-Perot with an advantage of being a four-port device capable of serving as an add-drop filter.
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