Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large Chiroptical Effects in Planar Chiral Metamaterials   Chiroptical effects, characterized by different optical responses for left-
(LCP) and right- handed circularly polarized light (RCP), are powerful and
valuable tools in optics with wide applications in polarization resolved
imaging and sensing. Previously observed strong chiroptical effects are limited
to metamaterials with complex three-dimensional chiral structures at the
sub-wavelength scale. Although asymmetrical transmission of LCP and RCP have
been investigated in planar chiral metasurfaces, the observed weak chiroptical
effects result from anisotropic Ohmic dissipation of the metal constituents.
Here, we demonstrate by theory and proof-of-concept experiments that large
difference in transmittances of LCP and RCP can be attained in a single-layer
planar chiral metamaterial with a sub-wavelength thickness. Without violating
the reciprocity and mirror symmetry, the strong chiroptical effect, independent
of dielectric loss, arise from a novel mechanism of multimode interference. The
described effect may lead to new gateway towards chiral manipulations of light
and chiral optical devices.

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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
2
The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas