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Opt Express. 2012 Nov 19;20(24):27039-44. doi: 10.1364/OE.20.027039.

High-Q width modulated photonic crystal stack mode-gap cavity and its application to refractive index sensing.

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  • 1Centre for Optical and Electromagnetic Research, State Key Laboratory for Modern Optical Instrumentation, Zhejiang Provincial Key Laboratory for Sensing Technologies, Zhejiang University, Zijingang Campus, Hangzhou, China.

Abstract

An optical sensor based on One-Dimensional photonic crystal (1D PhC) stack mode-gap cavity has been designed, fabricated and characterized. By introducing quadratically modulated width tapering structure, a waveguide coupled 1D PhC stack mode-gap cavity with calculated Q-factor 1.74 × 10(7) and an effective mode volume 1.48(λ/n(Si))(3) has been designed. This cavity has been used for sensing applications by immersing into water-ethanol mixture of different volume concentrations. Transmission measurement shows a quality factor as high as 27, 000 can be achieved for the cavity immersed in analytes. A sensitivity of 269nm/RIU has been demonstrated.

PMID:
23187559
[PubMed - indexed for MEDLINE]
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