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4 March 2016 Single chip AWG-based Raman spectroscopy for continuous glucose monitoring
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In this paper, we introduce an innovative proposal for a low cost micro Raman spectrometer for non-invasive glucose monitoring. In this design, an Array Waveguide Grating (AWG) chip integrated with PIN photodiodes and a prism coupling are proposed to replace fiber micro alignment in packaging and to reduce system cost. Experiments were designed and conducted to evaluate the impact of thickness of the waveguides and the incident angle of the laser beam on the efficiency of the prism coupling. Considerable light coupling was observed when the waveguide core is 2mm thick. An updated fabrication process was designed and test chip was also fabricated to determine the critical feature size to solve the problem of air bubble resulted in trench filling.
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Sheng Yang, Yen-Chun Yeh, John Ladasky, Avid Farhoodfar, and Dominik Schmidt "Single chip AWG-based Raman spectroscopy for continuous glucose monitoring", Proc. SPIE 9715, Optical Diagnostics and Sensing XVI: Toward Point-of-Care Diagnostics, 971518 (4 March 2016);

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