Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Special polarization characteristic features of a three-dimensional
  terahertz photonic crystal quantitatively evaluated by phase-differences with
  a FEM   A previous work, ref. 2 experimentally confirmed that measured special
polarization characteristic features of a three-dimensional terahertz (THz)
photonic-crystal did not apparently apply to general physical- and optical-
basic rules. It is said that three-dimensional (3D) photonic crystals (PC) have
no polarization anisotropy within photonic band gap (PBG, stop gap, stop band)
of high symmetry points in normal incidence. None the less because two
directions at right angles to each other on the plane (001) are
constitutionally and optically identical in appearance, the polarization
orientation of a reflected wave rotated by 90 degrees from that of an incident
wave at a frequency within the PBG when that of the incident wave was the
direction that bisects these two directions. The 3D-PC is a silicon inverse
diamond structure whose lattice point shape is vacant regular octahedrons. In
this work, the phase-difference, size and orientation of electric-field of the
reflected wave, had been studied by using a FEM (finite element method). The
analyses indicated the reason why the polarization orientation of the reflected
wave is rotated by 90 degrees at the frequency within the PBG. In addition, it
was found that the orbit of electric-field of the reflected wave becomes
near-circularly-polarized one at another frequency within the PBG for the
linear-polarization incident wave.

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The categories of this paper are: stat
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The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex