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We present our recent progress in designing nanophotonic devices for integrated sensing applications. We focus on Si-based microresonators and on-chip spectrometers as the main building blocks to implement compact sensing platforms with strong light-matter interaction. The performance of these devices is discussed, and their future prospects in realizing low-power low-cost portable multi-purpose sensing...
The combination of Si-based ultra-high Q micro-resonators and ultra-compact photonic crystal on-chip spectrometers has enabled highly-sensitive lab-on-a-chip sensing structures with orders-of-magnitude smaller size compared to conventional bulk sensing systems. Details of the design along with their experimental demonstrations will be presented.
The superprism effect is one of unique dispersive properties of PCs that has been proposed for integrated wavelength demultiplexing. However, diffraction of separated wavelength channels has been a main drawback in such PC demultiplexers. We demonstrate in this talk new compact PC demultiplexers by combining diffraction compensation and the superprism effect with better resolution, smaller size, lower...
We present measurements of the transmission and group delay properties of W1 triangular-lattice photonic crystal waveguides (PCWs) using a phase sensitive lock-in technique. Using a lock-in amplifier improved the SNR of the power transmission measurements by at least one order of magnitude, and also correlated features in the group delay spectra (obtained from phase measurements) to the complex transmission...
Compact spectrometers are one of important building blocks needed in implementing optical lab-on-a-chip sensing devices. Photonic crystal superprism demultiplexers due to their unique and strong dispersion properties are proper candidates for realizing such integrated spectrometers. We use a recently demonstrated device idea, i.e., focusing superprism photonic crystal demultiplexers, to implement...
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