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By repeated optical breakdown with focused femtosecond pulses, we decrease the refractive index of fused silica by few percent. The subsequent micro-lens formation is associated with a reduction of multiphoton absorption in all dielectrics.
We report our design and fabrication of superconducting nanowire single-photon detectors integrated with gold plasmonic nanostructures, which can enhance the absorption of TM-polarized light, and can enlarge the effective area without sacrificing detector speed.
We report GaAs-based transverse-junction-superluminescent-diodes, characterized as transverse-carrier-flow spread in quantum wells horizontally instead of vertical well-by-well injection. These devices overcome the problem of non-uniform-carrier-distribution and operate at a bio-optical window of 1.1-mum wavelength regime.
We review the basic principles of the femtosecond laser direct writing approach. This technology opens the possibility to specifically tune the light evolution in the linear as well as in the nonlinear regime.
We have fabricated an intrinsic fiber Mach-Zehnder interferometer (MZI) by imbedding a micro air-cavity using femtosecond laser and optimal arc-splicing. Spectral analysis confirmed the MZI with experimental results. Temperature dependence was also measured.
Three-dimensional icosahedral dielectric photonic quasicrystals previously revealed highly structured transmittance spectra and unusual photon transport properties. Using a periodic approximant approach, we show that all these findings are consistent with multiple scattering of light.
We present the theory and experimental realization of simultaneously localized and strongly coupled optical and mechanical modes in periodic nanostructures. The mechanical properties of localized phonons with Gigahertz frequencies and sub-picogram masses are studied via all-optical measurements.
We propose a novel phototransistor using uni-traveling carrier photodiode structure in base and collector layer and obtained RF optical gain of 29 dB at 1 GHz and 9 dB at 20 GHz in 10 mum by 10 mum optical window device.
We measure the angular dependent response of a Swiss-cross metamaterial that has an effective index of n=-1.9 at normal incidence. It is experimentally shown how the effective properties depend on the incidence angle.
We demonstrate a fast integrated germanium photodetector above 40 GHz and its integration with a silicon microring resonator-based wavelength division demultiplexer.
We describe an optical network-on-chip built from passive wavelength routing circuits and tunable micro transmitters based on microdisk sources. Operation of the different subcomponents will be demonstrated.
We demonstrate a very simple technique to fabricate robust micro bottle resonators. Spheroidal WGMs and bottle modes were excited preferentially using a tapered fiber coupled at specific locations along the bottle, and characteristic resonance spectra obtained.
Optical microcavites fabricated by etching whispering gallery mode and photonic crystal structures in a high-index gallium phosphide layer and an underlying single-crystal diamond substrate are studied experimentally and theoretically.
A new cavity-optomechanical system has been developed comprised of two doubly-clamped silicon nitride cantilevers with a 1D photonic crystal etched into them. We will discuss the optical properties of the system and potential applications to solid-state cavity QED with diamond color centers.
We report break-up of cylindrical shell into well-ordered filament arrays by optical-fiber thermal drawing. Enhanced photosensitivity of centimeter-long crystalline-Se nano-filaments is observed and the mechanism is discussed. This work paves a way to in-fiber nanodevices.
We show the features of a non-magnetic subwavelength imaging system achieved with an anisotropic bilayer. The two anisotropic layers can be implemented with metal-insulator stacks, and the resonance condition is not required for either layer.
A simple chemical method for reducing free-carrier lifetime in silicon photonics while maintaining low optical loss is presented. Lifetimes of ~ 300 ps for optical losses of ~ 0.4 cm-1 are achieved. Ramifications for nonlinear optics are discussed.
We use a heterodyne NSOM with superluminescent diode illumination to measure the loss in an SOI waveguide around a bend. For a bend of radius 10 mum, we measure loss of 0.09 dB.
Building quantum optical circuits with waveguides-on-a-chip networks is a practical route to scalable quantum information processing. We report circuits made using direct-write laser techniques that create high fidelity, 2 or 3-dimensional, fiber compatible quantum networks.
Regrowth-free gain-coupled GaSb-based DFB lasers suitable for gas sensing were fabricated. Threshold currents for 2.4 mum emission of 400 mum-long DFB devices were 45 mA with a total output power of nearly 11 mW in CW operation at 20degC.
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