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Sensitivity Enhancement of Photonic Crystal Waveguide Based Sensor Using Ring Shaped Holes

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In this work, ring shaped photonic crystal waveguide is designed using finite difference time domain method. This waveguide can be used for gas sensing applications. After introducing the line defect, transmission spectra was obtained with different hole diameters. With the increase in hole diameter, the sensitivity increases. Further enhancement in sensitivity was measured by etching in silicon guiding layer and up to a certain depth in the buried oxide layer. It was observed that the sensitivity increases up to certain etch depth after which it is found to be decreasing. After this, infiltration with different gaseous analytes was done to measure the sensitivity based on the shift in the cut off wavelength as observed because of the change in refractive index of the structure. The experimental results showed that the ring shaped structure had a sensitivity value of 675 nm/RIU. This sensor can be used to sense different gases like hydrogen, ammonia, nitrogen etc.
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Document Type: Research Article

Publication date: 01 January 2017

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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