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High quality factor photonic crystal filter at k ≈0 and its application for refractive index sensing.
Optics Express 2017 May 2
We report here the refractive index (RI) sensing using the singly degenerate high quality factor (Q) modes in photonic crystal slabs (PCS) with the free-space coupled incident beam close to normal incidence. Q values of 3.2x10<sup>4</sup> and 1.8x10<sup>4</sup> were achieved for the fabricated PCS in air and aqueous solution, respectively. A spectral sensitivity (S) of 94.5 nm/RIU and a detection limit (DL) of 3x10<sup>-5</sup> RIU were achieved with our device. Such a high-Q cavity for the singly degenerate mode close to normal incidence is very promising to achieve a lower DL for RI sensing.
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