NEMS-tunable dielectric chiral metasurfaces.

NEMS-tunable dielectric chiral metasurfaces.
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可nems调谐的介电手性超表面。

DOI:
10.1021/acsphotonics.1c00898
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发表时间:
2021-10-20
期刊:
影响因子:
7
通讯作者:
Faraon, Andrei
Faraon, Andrei
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Kwon, Hyounghan;Faraon, Andrei

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主动控制元表面中的强手握光学响应可以为光学偏振工程提供新的机会。等离子体激活手性超颖表面已经被研究过,但是由于等离子体共振的固有损耗,它们的可调谐手性光学响应受到限制,因此激发了低损耗有源介电手性超颖表面的研究。在众多的调谐方法中,电调谐介电手性超颖表面由于其潜在的片上集成而很有前途。在这里,我们实验证明纳米机电可调介电手性超颖表面与反射圆二色性(CD)。我们显示了绝对反射下的圆偏振的正交偏振的入射光在模拟中超过0.85和超过0.45的实验之间的差异。该器件能够通过感应静电力从0.45到0.01连续控制CD,电偏压为3V。这项工作突出了可扩展的光偏振调制器的纳米机电可调超颖表面的潜力。
Active control of strong chiroptical responses in metasurfaces can offer new opportunities for optical polarization engineering. Plasmonic active chiral metasurfaces have been investigated before, but their tunable chiroptical responses is limited due to inherent loss of plasmonic resonances, thus stimulating research in low loss active dielectric chiral metasurfaces. Among diverse tuning methods, electrically tunable dielectric chiral metasurfaces are promising thanks to their potential for on-chip integration. Here, we experimentally demonstrate nano-electromechanically tunable dielectric chiral metasurfaces with reflective circular dichroism (CD). We show a difference between absolute reflection under circulary polarized incident light with orthogonal polarization of over 0.85 in simulation and over 0.45 experimentally. The devices enable continuous control of CD by induced electrostatic forces from 0.45 to 0.01 with an electrical bias of 3V. This work highlights the potential of nano-electromechanically tunable metasurfaces for scalable optical polarization modulators.
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影响因子: 16.6
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