Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broadband operation of active terahertz quarter-wave plate achieved with
  vanadium-dioxide-based metasurface switchable by current injection   We demonstrate the broadband operation of a switchable terahertz quarter-wave
plate achieved with an active metasurface employing vanadium dioxide. For this
purpose, we utilize anisotropically deformed checkerboard structures, which
present broadband characteristics compatible with deep modulation. Moreover,
the metasurface is integrated with a current injection circuit to achieve state
switching; this injection circuit can also be employed to monitor the electric
state of vanadium dioxide. We estimate the Stokes parameters derived from the
experimental transmission spectra of the fabricated metasurface and confirm the
helicity switching of circularly polarized waves near a designed frequency of
0.66THz. The relative bandwidth is evaluated as 0.52, which is 4.2 times
broader than that in a previous study.

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The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
30
The categories of this paper are: q-alg