Highly sensitive and selective gas sensing using the defect mode of a compact terahertz photonic crystal cavity

doi:10.1016/j.snb.2018.07.156

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	Highly sensitive and selective gas sensing using the defect mode of a compact terahertz photonic crystal cavity
	Shi, Xiaomei 2; Zhao, Zongshan 3; Han, Zhanghua 1
	2018-11-20
发表期刊	SENSORS AND ACTUATORS B-CHEMICAL
ISSN	0925-4005
卷号	274 页码:188-193
摘要	The photon energies corresponding to the pure rotational transitions of small polar compounds fall into the terahertz regime, which suggests a high potential of terahertz technology in gas detection, particularly for toxic gases. However, the weak dipole moments caused by pure rotational transitions severely limit the gas detectability at low concentration, leading to the requirement of a long gas cell. Here, we present a highly sensitive and selective detection method using photonic crystal cavity defect mode with the resonance tailored to the characteristic absorption peak of the target gas specimen. The cavity resonance will experience decaying only when the target gas is introduced, and then can be used to exclusively detect the target gas. Numerical calculations show that due to the high dependence of the defect mode transmittance on the specimen absorption at the same frequency, a toxic gas-hydrogen cyanide (HCN) with concentration of only 2 ppm in air under the standard atmospheric pressure of 1 atm can be identified using a photonic crystal cavity with the overall length around 5 mm, two orders of magnitude shorter than the pipe gas cell used in the regular transmission method.
关键词	Gas sensor Terahertz spectroscopy Photonic crystal cavity Fabry-Perot
DOI	10.1016/j.snb.2018.07.156
关键词[WOS]	BANDGAP FIBER ; SENSOR ; SPECTROSCOPY ; TECHNOLOGY ; SYSTEM ; LASER ; TIME
语种	英语
WOS研究方向	Chemistry ; Electrochemistry ; Instruments & Instrumentation
WOS类目	Chemistry, Analytical ; Electrochemistry ; Instruments & Instrumentation
WOS记录号	WOS:000443960000022
出版者	ELSEVIER SCIENCE SA
引用统计
文献类型	期刊论文
条目标识符	http://ir.qibebt.ac.cn/handle/337004/11922
专题	中国科学院青岛生物能源与过程研究所
通讯作者	Han, Zhanghua
作者单位	1.Nanjing Univ Sci & Technol, Adv Launching Coinnovat Ctr, Nanjing 210094, Jiangsu, Peoples R China 2.China Jiliang Univ, Lab Terahertz Photon, Hangzhou 310018, Zhejiang, Peoples R China 3.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, CAS Key Lab Biobased Mat, Qingdao 266101, Peoples R China
推荐引用方式 GB/T 7714	Shi, Xiaomei,Zhao, Zongshan,Han, Zhanghua. Highly sensitive and selective gas sensing using the defect mode of a compact terahertz photonic crystal cavity[J]. SENSORS AND ACTUATORS B-CHEMICAL,2018,274:188-193.
APA	Shi, Xiaomei,Zhao, Zongshan,&Han, Zhanghua.(2018).Highly sensitive and selective gas sensing using the defect mode of a compact terahertz photonic crystal cavity.SENSORS AND ACTUATORS B-CHEMICAL,274,188-193.
MLA	Shi, Xiaomei,et al."Highly sensitive and selective gas sensing using the defect mode of a compact terahertz photonic crystal cavity".SENSORS AND ACTUATORS B-CHEMICAL 274(2018):188-193.