期刊
OPTICS EXPRESS
卷 25, 期 9, 页码 10536-10545出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.25.010536
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资金
- [US NSF ECCS-1407947]
- [US ARO W911NF-15-1-0431]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1407947] Funding Source: National Science Foundation
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(4) and 1.8x10(4) 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(-5) 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. (C) 2017 Optical Society of America
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