Extraordinary terahertz transmission through subwavelength spindle-like apertures in NbN film

doi:10.1088/1674-1056/23/1/014101

Abstract We studied numerically the temperature dependent extraordinary terahertz transmission through niobium nitride (NbN) film perforated with subwavelength spindle-like apertures. Both the resonant frequency and intensity of extraordinary terahertz transmission peaks can be greatly modified by the transition of NbN film from the normal state to the superconducting state. An enhancement of the (±1,0) NbN/magnesium oxide (MgO) peak intensity as high as 200% is demonstrated due to the combined contribution of both the superconducting transition and the excitation of localized surface plasmons (LSPs) around the apertures. The extraordinary terahertz transmission through spindle-like hole arrays patterned on the NbN film can pave the way for us to explore novel active tuning devices.

Keywords: extraordinary terahertz transmission superconducting transition spindle-like apertures localized surface plasmon mode

Received: 10 May 2013
Revised: 10 July 2013
Accepted manuscript online:

PACS:	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00110 and 2011CBA00107) and the National Natural Science Foundation of China.

Corresponding Authors: Zheng Xiao-Rui
E-mail: zhengxiaorui1986@hotmail.com

Cite this article:

Zheng Xiao-Rui (郑小睿), Cheng Fei (程飞), Wu Jing-Bo (吴敬波), Jin Biao-Bing (金飚兵), Zhu Bei-Yi (朱北沂) Extraordinary terahertz transmission through subwavelength spindle-like apertures in NbN film 2014 Chin. Phys. B 23 014101

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Extraordinary terahertz transmission through subwavelength spindle-like apertures in NbN film

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