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

	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
刊名	SENSORS AND ACTUATORS B-CHEMICAL
	2018-11-20
卷号	274 页码:188-193
关键词	Gas sensor Terahertz spectroscopy Photonic crystal cavity Fabry-Perot
ISSN号	0925-4005
DOI	10.1016/j.snb.2018.07.156
英文摘要	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.
WOS关键词	BANDGAP FIBER ; SENSOR ; SPECTROSCOPY ; TECHNOLOGY ; SYSTEM ; LASER ; TIME
WOS研究方向	Chemistry ; Electrochemistry ; Instruments & Instrumentation
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000443960000022
内容类型	期刊论文
源URL	[http://ir.qibebt.ac.cn/handle/337004/11921]
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.