Strong, spectrally-tunable chirality in diffractive metasurfaces

Scientific Reports
Israel De LeonRobert W Boyd

Abstract

Metamaterials and metasurfaces provide a paradigm-changing approach for manipulating light. Their potential has been evinced by recent demonstrations of chiral responses much greater than those of natural materials. Here, we demonstrate theoretically and experimentally that the extrinsic chiral response of a metasurface can be dramatically enhanced by near-field diffraction effects. At the core of this phenomenon are lattice plasmon modes that respond selectively to the illumination's polarization handedness. The metasurface exhibits sharp features in its circular dichroism spectra, which are tunable over a broad bandwidth by changing the illumination angle over a few degrees. Using this property, we demonstrate an ultra-thin circular-polarization sensitive spectral filter with a linewidth of ~10 nm, which can be dynamically tuned over a spectral range of 200 nm. Chiral diffractive metasurfaces, such as the one proposed here, open exciting possibilities for ultra-thin photonic devices with tunable, spin-controlled functionality.

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Citations

Apr 23, 2016·Scientific Reports·Yao LiangSonghao Liu
Mar 18, 2017·Nano Letters·Chen YanOlivier J F Martin
Mar 7, 2019·Light, Science & Applications·Alexander Y ZhuFederico Capasso
Aug 16, 2017·Scientific Reports·Zhancheng LiJianguo Tian
Aug 17, 2018·Optics Express·Paweł WoźniakPeter Banzer
Dec 23, 2019·Nanoscale Research Letters·Liyuan CaoJingjun Xu
Jul 1, 2017·Physical Review Letters·Lior MichaeliTal Ellenbogen
Feb 22, 2018·Scientific Reports·Yane WangJingjun Xu
Apr 23, 2020·Advanced Materials·Eric S A GoerlitzerNicolas Vogel
Apr 20, 2021·Nanotechnology·Haoran LvShuyun Teng
Jun 5, 2018·Chemical Reviews·V G KravetsA N Grigorenko
Nov 13, 2020·ACS Nano·Katsuya TanakaIsabelle Staude
Aug 28, 2021·Nanomaterials·Yulia V Vladimirova, Victor N Zadkov

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Methods Mentioned

BETA
surface plasmon resonances
circular dichroism

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