Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Freestanding transparent terahertz half-wave plate using subwavelength
  cut-wire pairs   We designed a cut-wire-pair metasurface that works as a transparent terahertz
half-wave plate, by matching the electric and magnetic resonances of the
structure. Due to the impedance matching nature of the resonances, a large
transmission phase shift between the orthogonal polarizations was achieved,
while permitting a high transmission. The electric and magnetic responses of
the proposed structure were confirmed by evaluating the electric admittance and
magnetic impedance. The structure was fabricated on a flexible film and its
helicity-conversion function in the terahertz frequency range was
experimentally demonstrated. The thickness of the device is less than 1/10 of
the working vacuum wavelength, and a high amplitude helicity conversion rate
over 80% was achieved. Finally, using simulations, we demonstrate the
feasibility of the gradually rotating cut-wire-pair array in terahertz
wave-front control.

18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol