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Extraordinary terahertz transmission through subwavelength spindle-like apertures in NbN film
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作者 郑小睿 程飞 +2 位作者 吴敬波 金飚兵 朱北沂 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第1期230-233,共4页
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 o... 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. 展开更多
关键词 extraordinary terahertz transmission superconducting transition spindle-like apertures localized surface plasmon mode
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Electrically tunable resonant terahertz transmission in subwavelength hole arrays
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作者 张莹 刘应开 韩家广 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第6期1-4,共4页
An actively enhanced resonant transmission in a plasmonic array of subwavelength holes is demonstrated by use of terahertz time-domain spectroscopy. By connecting this two-dimensional element into an electrical circui... An actively enhanced resonant transmission in a plasmonic array of subwavelength holes is demonstrated by use of terahertz time-domain spectroscopy. By connecting this two-dimensional element into an electrical circuit, tunable resonance enhancement is observed in arrays made from good and relatively poor metals. The tunable feature is attributed to the nonlinear electric response of the periodic hole array film, which is confirmed by its voltage-current behavior. This finding could lead to a unique route to active plasmonic devices, such as tunable filters, spatial modulators, and integrated terahertz optoelectronic components. 展开更多
关键词 surface plasmons enhanced terahertz transmission electrically tunable
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