High quality factor photonic crystal filter at k ≈0 and its application for refractive index sensing

被引：53
作者：
Liu, Yonghao [1 ]
Wang, Shuling [1 ]
Zhao, Deyin [1 ]
Zhou, Weidong [1 ]
Sun, Yuze [1 ]
机构：
[1] Univ Texas Arlington, Dept Elect Engn, Arlington, TX 76019 USA
来源：
OPTICS EXPRESS | 2017年 / 25卷 / 09期
基金：
美国国家科学基金会;
关键词：
OPTICAL BIOSENSOR; FANO RESONANCE; ABSORPTION; SENSOR; MODE; SENSITIVITY;
D O I：
10.1364/OE.25.010536
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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
引用
收藏
页码：10536 / 10545
页数：10
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