Modulating Sub-THz Radiation with Current in Superconducting Metamaterial

被引：91

作者：

Savinov, V. ^{[1
,2
]}

Fedotov, V. A. ^{[1
,2
]}

Anlage, S. M. ^{[3
]}

de Groot, P. A. J. ^{[2
,4
]}

Zheludev, N. I. ^{[1
,2
,5
]}

机构：

[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England

[2] Univ Southampton, Ctr Photon Metamat, Southampton SO17 1BJ, Hants, England

[3] Univ Maryland, Dept Phys, Ctr Nanophys & Adv Mat, College Pk, MD 20742 USA

[4] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[5] Nanyang Technol Univ, Ctr Disrupt Photon Technol, Singapore 637371, Singapore

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 24期

基金：

英国工程与自然科学研究理事会; 美国国家科学基金会;

关键词：

TERAHERTZ; RESONANCE; SAPPHIRE; DYNAMICS; FILM;

D O I：

10.1103/PhysRevLett.109.243904

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that subterahertz transmission of the superconducting metamaterial, an interlinked two-dimensional network of subwavelength resonators connected by a continuous superconducting wire loop, can be dynamically modulated by passing electrical current through it. We have identified the main mechanisms of modulation that correspond to the suppression of the superconductivity in the network by magnetic field and heat dissipation. Using the metamaterial fabricated from thin niobium film, we were able to demonstrate a transmission modulation depth of up to 45% and a bandwidth of at least 100 kHz. The demonstrated approach may be implemented with other superconducting materials at frequencies below the superconducting gap in the THz and subterahertz bands. DOI: 10.1103/PhysRevLett.109.243904

引用

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