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We demonstrate Kerr-effect-based optical switching of amorphous Si microring resonators with full-width-at-half-maximum switching times of 14.8 ps at 1550 nm; low two-photon absorption reduces the creation of free carriers which would inhibit fast switching.
We describe a photonic crystal nanocavity with multiple spatially overlapping resonances that can serve as a platform for nonlinear frequency conversion. We show nonlinear characterization of structures with two resonances nearly degenerate in frequency. We also demonstrate structures with resonances separated by up to 592 nm.
We develop a new method to transfer photonic crystal resonators to the tips of optical fibers. High Q (2000–4000) cavities are coupled via transmission or PL emission to the fibers in both Si and GaAs.
We demonstrate enhanced second harmonic generation in a GaP photonic crystal waveguide with external conversion efficiency of 5×10−7/W. Our results are promising for frequency conversion of ultrashort pulses and on-chip integrated emitters with broad spectra.
The combination of a single quantum emitter (a quantum dot) and an optical nanocavity has been employed to demonstrate devices ranging from quantum sources and gates to optical switches and modulators controlled with sub-fJ energies.
A combination of a single quantum emitter (a semiconductor quantum dot) with a semiconductor optical nanocavity has been employed to demonstrate devices ranging from optical switches and modulators controlled with sub-fJ energies, to quantum sources.
We demonstrate a 300 MHz quantum dot single photon source at 900 nm triggered by a telecommunications wavelength laser. The quantum dot is excited by on-chip-generated second harmonic radiation, resonantly enhanced by a photonic nanocavity.
A photonic crystal cavity allowing at least two separately tunable resonances is designed. Both frequency degenerate structures and structures with frequency separations of up to 500 nm are experimentally demonstrated.
Photoluminescence at 1.53 um from Er: SiNx on silicon photonic crystal cavities was extracted via fiber tapers with 2.5 x greater collection efficiency compared to free space emission. Fibers were also used to demonstrate a 10 nm tuning range of 750 nm SHG emission from GaP cavities.
Using photonic crystal nanocavities fabricated in the semiconductor gallium phosphide, we demonstrate second harmonic generation with input continuous wave powers of nanowatts (at 1550 nm).
Fluorescence spectroscopy is a promising technology for the detection of cervical squamous intraepithelial lesions (SILs). In this study we took repeated measures in the cervix to determine whether the order of measurement produces changes in fluorescence intensity and whether there are differences in variation due to pressure.A pressure sensitive fiber-optic probe to measure fluorescence spectra...
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