Cryogenic temperatures as a path toward high-Q terahertz metamaterials

被引：55

作者：

Singh, Ranjan ^{[1
,2
]}

Tian, Zhen ^{[1
,3
,4
,5
]}

Han, Jiaguang ^{[6
]}

Rockstuhl, Carsten ^{[7
]}

Gu, Jianqiang ^{[1
,3
,4
,5
]}

Zhang, Weili ^{[1
]}

机构：

[1] Oklahoma State Univ, Sch Elect & Comp Engn, Stillwater, OK 74078 USA

[2] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA

[3] Tianjin Univ, Ctr Terahertz Waves, Tianjin 300072, Peoples R China

[4] Tianjin Univ, Coll Precis Instrument & Optoelect Engn, Tianjin 300072, Peoples R China

[5] Minist Educ Res, Key Lab Optoelect Informat & Tech Sci, Tianjin 300072, Peoples R China

[6] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[7] Univ Jena, Inst Condensed Matter Theory & Solid State Opt, D-07743 Jena, Germany

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 07期

基金：

美国国家科学基金会;

关键词：

cryogenics; electron backscattering; high-speed optical techniques; insulating thin films; metamaterials; microwave materials; optical films; optical materials; Q-factor; SPLIT-RING RESONATORS;

D O I：

10.1063/1.3313941

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Optical properties of planar thin film metamaterials were measured at room and liquid nitrogen temperatures using terahertz time-domain spectroscopy. The operation of metamaterials at cryogenic temperatures is anticipated to be a promising path toward low-loss metamaterials since nonradiative losses are strongly suppressed due to higher charge mobility. A 14% increase in the quality factor of the resonances was experimentally observed. It was limited by the high electron scattering rate due to defects in thin films. Supplementary simulations assuming metamaterials made of thick films reveal a temperature controlled behavior and a 40% increase in the quality factor at 10 K.

引用

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