Journal
OPTICS EXPRESS
Volume 24, Issue 12, Pages 12549-12556Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.012549
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Funding
- Agency for Science Technology and Research (A*STAR) Biomedical Engineering Program Grant, Singapore [1421480025]
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An optical sensor based on grating-assisted light coupling between a strip waveguide and a slot waveguide is demonstrated (the sensor was proposed and analyzed in [Opt. Express 21, 5897-5909 (2013)]. The wavelength at which the light is strongly coupled between two waveguides is used to the measure the external medium's refractive index. The sensor was fabricated with silicon nitride waveguides and obvious grating induced band-rejection and band-pass characteristics were observed. The measured sensitivity of the fabricated sensor was -756.1 nm/RIU. Furthermore, by covering the strip waveguide with the silicon dioxide cladding, the sensitivity was measured to be as large as -1970 nm/RIU, which was 2.6 times enhanced. The experimental results agreed well with the calculated sensitivity values. (c) 2016 Optical Society of America
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