Electromechanically Tunable Metasurface Transmission Waveplate at Terahertz Frequencies
Posted on 2018-03-13 - 20:45
Dynamic polarization control of light is essential for numerous applications ranging from enhanced imaging to materials characterization and identification. We present a reconfigurable terahertz metasurface quarter-waveplate consisting of electromechanically actuated micro-cantilever 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 ~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-waveplate enriches the library of terahertz optical components, thereby facilitating practical applications of terahertz technologies.
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Zhao, Xiaoguang; Schalch, Jacob; Zhang, Jingdi; Seren, Huseyin; Duan, Guangwu; Averitt, Richard; et al. (2018). Electromechanically Tunable Metasurface Transmission Waveplate at Terahertz Frequencies. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4010749.v1
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AUTHORS (7)
XZ
Xiaoguang Zhao
JS
Jacob Schalch
JZ
Jingdi Zhang
HS
Huseyin Seren
GD
Guangwu Duan
RA
Richard Averitt
XZ
Xin Zhang