Tuning of superconducting niobium nitride terahertz metamaterials

被引：58

作者：

Wu, Jingbo ^{[1
]}

Jin, Biaobing ^{[1
]}

Xue, Yuhua ^{[1
]}

Zhang, Caihong ^{[1
]}

Dai, Hao ^{[1
]}

Zhang, Labao ^{[1
]}

Cao, Chunhai ^{[1
]}

Kang, Lin ^{[1
]}

Xu, Weiwei ^{[1
]}

Chen, Jian ^{[1
]}

Wu, Peiheng ^{[1
]}

机构：

[1] Nanjing Univ, RISE, Sch Elect Sci & Engn, Nanjing 210093, Peoples R China

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 13期

关键词：

MAGNETIC RESPONSE; FANO RESONANCES; PERMITTIVITY; RESONATORS;

D O I：

10.1364/OE.19.012021

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Superconducting planar terahertz (THz) metamaterials (MMs), with unit cells of different sizes, are fabricated on 200 nm-thick niobium nitride (NbN) films deposited on MgO substrates. They are characterized using THz time domain spectroscopy over a temperature range from 8.1 K to 300 K, crossing the critical temperature of NbN films. As the gap frequency (f(g) = 2 Delta(0)/h, where Delta(0) is the energy gap at 0 K and h is the Plank constant) of NbN is 1.18 THz, the experimentally observed THz spectra span a frequency range from below f(g) to above it. We have found that, as the resonance frequency approaches f(g), the relative tuning range of MMs is quite wide (30%). We attribute this observation to the large change of kinetic inductance of superconducting film. (C) 2011 Optical Society of America

引用

页码：12021 / 12026

页数：6

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