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Surface Enhanced Raman Scattering (SERS) has a great potential to serve as a monitoring technology for biomolecules, but sensing biomolecules for practical purposes have remained challenging for two reasons. One of the challenges is securing SERS substrates with uniform spatial enhancement that is crucial for quantitative measurements, and the other is finding proper linker molecules that will promote...
In this work, a whispering gallery mode (WGM) microdisk resonator based on grown by molecular beam epitaxy (MBE) was fabricated and characterized. Various process conditions and different Sn contents (4% and 1%) were explored to confirm the feasibility of for microcavity device operation. Optical modes with wavelengths in the infrared (IR)...
We propose a design method of structured grating for out of plane conversion, focusing and manipulation of Surface Plasmon Polariton waves. Advanced functional devices, such as balanced power splitters, and wavelength demultiplexers are demonstrated with high conversion efficiency.
We proposed, for the first time, to utilize metal-slits array Fresnel lens for the optical coupling form free space into silicon slab waveguide while overcoming near focal length limit of the conventional dielectric Fresnel lens. Physical limits of the conventional Fresnel lens were revealed and it was proposed to employ metal-slit array to overcome these limitations. Comparative study has been carried...
We proposed an all-optical logic system constructed by combining cross-waveguide geometries including nonlinear cavity enabling all-kinds of logic gates. Proposed logic system is reconfigurable into any kinds of Boolean operations by appropriate placing of defect rods and adjusting its refractive index.
Coded-output photonic ADC based on PC slow-light structure is proposed. Limiting factors in the high speed operation is analyzed by using 2D-FDTD, with discussions on the feasibility of applying the design to the silicon platform.
Operation frequency tuning for an all-optical switch employing 2-dimensional cross-waveguide photonic crystal is demonstrated with an electric field bias control. Applying static electric field up to 600 V/mum perpendicular to the signal plane, up to 10 THz tuning of the switching frequency can be achieved, without any degradation in the switching characteristics of the device.
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