High quality factor and high sensitivity chalcogenide 1D photonic crystal microbridge cavity for mid-infrared sensing
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文摘

We present and theoretically investigate a mid-infrared (mid-IR) optical sensor based on a Ge11.5As24Se64.5 one-dimensional (1D) photonic crystal micro-bridge cavity.

A calculated sensitivity of as high as 2280 nm/RIU (refractive index unit) is achieved with a resonant wavelength of 4132 nm.

The figure of merit of the device for sensing is extremely high at ~930,000.

Furthermore, the sensing part of our device (50 × 3 μm2) is only 1/1000 that of the recently reported microring mid-IR sensor (larger than 600 × 360 μm2).

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