Abstract
Polarization is an important property of electromagnetic (EM) wave and different polarization manipulations are required for varied optical applications. Here we report a reconfigurable metasurface which achieves both the polarization conversion and the polarization rotation in THz regime. The metasurface is reconfigured through the micro-electro-mechanical-systems (MEMS) actuation. The cross polarization transmittance from a linear polarized incidence is experimentally tuned from 0 to 28% at 2.66 THz. In addition, the polarization rotation angle is effectively changed from −12.8° to 13.1° at 1.78 THz. The tunable bi-functional metasurface for polarization conversion and the polarization rotation can be flexibly applied in various applications such as imaging, polarization microscopy and material analysis, etc.
Highlights
As an intrinsic property of the electromagnetic (EM) wave, polarization plays an important role in varied areas like optical imaging[1], life science microscopy[2] and multiplexed optical communication[3], etc
It is demonstrated that significant tunability can be realized by changing the couplings between the metallic components in the metamolecule
The conversion efficiency is variable between 0 and 28% at 2.66 THz under normal incidence while the polarization rotation angle is effectively tunable from −12.8° to 13.1° with an incident angle of 45° at 1.78 THz
Summary
As an intrinsic property of the electromagnetic (EM) wave, polarization plays an important role in varied areas like optical imaging[1], life science microscopy[2] and multiplexed optical communication[3], etc. The polarization direction can be effectively manipulated through the polarization conversion or the polarization rotation[4, 5]. The polarization conversion is conventionally achieved through anisotropic materials or structures[6], while the polarization rotation usually relies on the Faraday Effect[7]. The polarization conversion through a metasurface largely relies on the anisotropy of the metamolecule, while the polarization rotation is commonly realized through a chiral structured metamolecule[19,20,21,22]. For effective control of the polarization in real applications, flexible and multi-functional metasurfaces are proposed[23, 24]. The polarized THz wave could play an important role in THz communication multiplexing, anisotropic or birefringent material analysis and holographic imaging, etc
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