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Extrinsically 2D-Chiral Metamirror in Near-Infrared Region
journal contribution
posted on 2020-01-13, 19:43 authored by Libang Mao, Kuan Liu, Shuang Zhang, Tun CaoMany previously observed strong chiroptical
effects are limited
to chiral metamaterials with complex three-dimensional building blocks.
Recently, chiral metamirrors consisting of planar elements are proposed
to selectively reflect one particular circularly polarized light (CPL)
while absorbing the other, with the reflected one either preserving
or altering its spin state. However, they are limited by complicated
subwavelength chiral profiles of their unit cells, which are challenging
to fabricate in the visible-near-infrared (NIR) region. We present
an extrinsically chiral metamirror that reflects one CPL preserving
its handedness while strongly absorbing the other, reaching a circular
conversion dichroism (CCD) in reflectance as large as 0.43 in the
NIR region. Our polarization-conserving mirror possesses an Au pillar
array and a continuous Al film separated by a SiO2 dielectric
layer, where the Au pillars are periodically arranged by a rectangular
lattice. The rather simple geometry of mirror significantly simplifies
its fabrication in the high frequency region. The pronounced CCD originates
from a chiral triad of the achiral resonator array and light’s
propagation direction. Such a chiral mirror provides an efficient
methodology toward handedness-selective modulation of the CPL and
finds applications in planar photonic devices such as molecular spectroscopy,
quantum information, and polarimetric imaging.
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Keywords
CCDpillar arraychiral metamirrorssubwavelength chiral profilesunit cellsExtrinsically 2 D-Chiral Metamirrorextrinsically chiral metamirrorchiral triadSiO 2 dielectric layerachiral resonator arraypolarization-conserving mirrorpolarimetric imagingchiral metamaterialsphotonic devicesAl filmbuilding blocksfrequency regionhandedness-selective modulationCPLNear-Infrared Regionquantum informationchiroptical effectsNIR regionconversion dichroismchiral mirror
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