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Chi(3) VIS/NIR nonlinear optics in silicon-based waveguide circuitsResearch Area: Integrated nonlinear optics , Photonic integrated circuits for the visible/near IR , Silicon photonics for lab-on-chip spectroscopy Main Researcher: Haolan Zhao Silicon photonics leverages the well-developed CMOS fabrication infrastructure for the realization of photonic integrated circuits. This includes devices implemented on silicon-on-insulator and SiN-based circuits. Applications in the visible and near-infrared require the use of SiN waveguide structures, which can be complemented with the integration of high performance silicon-based photodetectors. This enables many applications in the biomedical field in the therapeutic window around 780nm. ![]() Raman Spectroscopy. The figure is reprinted from Wikipedia. Coherent Anti-Stokes Raman spectroscopy is such an application that allows a sensitive and high throughput analysis of a biological sample of interest. CARS requires either a supercontinuum source or two synchronized short pulse sources of which one is tunable in wavelength. This can be realized using nonlinear optics on a SiN platform and forms the baseline for this work. Given the relatively low nonlinear parameter of SiN the heterogeneous integration of other materials is pursued to enhance the efficiency. ![]() CARS image of a brain slice. The figure is a reprint from [1]. [1] Y. Fu, T. Huff, H. Wang, J. Cheng, and H. Wang, "Ex vivo and in vivo imaging of myelin fibers in mouse brain by coherent anti-Stokes Raman scattering microscopy," Opt. Express 16, 19396-19409 (2008). Other people involved: PhD thesises
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