Electromechanically tunable metasurface transmission waveplate at terahertz frequencies

被引：170

作者：

Zhao, Xiaoguang ^{[1
]}

Schalch, Jacob ^{[2
]}

Zhang, Jingdi ^{[2
]}

Seren, Huseyin R. ^{[1
]}

Duan, Guangwu ^{[1
]}

Averitt, Richard D. ^{[2
]}

Zhang, Xin ^{[1
]}

机构：

[1] Boston Univ, Dept Mech Engn, Boston, MA 02215 USA

[2] Univ Calif San Diego, Dept Phys, La Jolla, CA 92903 USA

来源：

OPTICA | 2018年 / 5卷 / 03期

基金：

美国国家科学基金会;

关键词：

WAVE PLATE; METAMATERIAL; CONVERSION; MODULATOR; OPTICS;

D O I：

10.1364/OPTICA.5.000303

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Dynamic polarization control of light is essential for numerous applications ranging from enhanced imaging to material characterization and identification. We present a reconfigurable terahertz metasurface quarter-wave plate consisting of electromechanically actuated microcantilever arrays. Our anisotropic metasurface enables tunable polarization conversion through cantilever actuation. Specifically, voltage-based actuation provides mode-selective control of the resonance frequency, enabling real-time tuning of the polarization state of the transmitted light. The polarization tunable metasurface has been fabricated using surface micromachining and characterized using terahertz time domain spectroscopy. We observe a similar to 230 GHz cantilever actuated frequency shift of the resonance mode, sufficient to modulate the transmitted wave from pure circular polarization to linear polarization. Our CMOS-compatible tunable quarter-wave plate enriches the library of terahertz optical components, thereby facilitating practical applications of terahertz technologies. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：303 / 310

页数：8

共 62 条

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