Highly sensitive terahertz fingerprint sensing with high-Q guided resonance in photonic crystal cavity

被引：22
作者：
Cheng, Wei [1 ]
Han, Zhanghua [2 ]
Du, Yong [1 ]
Qin, Jianyuan [1 ]
机构：
[1] China Jiliang Univ, Ctr Terahertz Res, Hangzhou 310018, Zhejiang, Peoples R China
[2] Nanjing Univ Sci & Thchnol, Adv Launching Coinnovat Ctr, Nanjing 210094, Jiangsu, Peoples R China
来源：
OPTICS EXPRESS | 2019年 / 27卷 / 11期
基金：
中国国家自然科学基金;
关键词：
IDENTIFICATION; INDEX; SLABS; MODE;
D O I：
10.1364/OE.27.016071
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In order to solve the problem of low sensitivity and poor selectivity in biochemical sensing using terahertz technology. a new sensing scheme based on photonic crystal cavity structure is proposed. It is composed of two identical photonic crystal slabs, each of which consists of a square lattice of silicon-based cylindrical pillars on a silicon substrate. The geometric parameters of the cavity are optimized to obtain a guided resonance peak at 529.2 GHz with a high quality factor of 529. The detected object is located in the middle of cavity where the electric field is strongly localized and confined. The effective detection of lactose with only a few microns thick is taken as an example to demonstrate the sensing performance of this cavity. A distinct decrease in transmittance at resonance peak is observed. The sensitivity using our proposed cavity is 31 times higher than that of using a substrate. Moreover, the selectivity of this photonic crystal cavity for the target is also verified by using fructose as the non-target. These results show that the photonic crystal cavity has potential to be applied for fingerprint detection with high sensitivity as well as selectivity in terahertz sensing. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码：16071 / 16079
页数：9
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