Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Periodically Aligned Liquid Crystal: Potential application for
  projection displays   A nematic liquid crystal (NLC) layer with the anisotropy axis modulated at a
fixed rate q in the transverse direction is considered. If the layer locally
constitutes a half-wave plate, then the thin-screen approximation predicts 100%
-efficient diffraction of normal incident wave. The possibility of implementing
such a layer via anchoring at both surfaces of a cell with thickness L is
studied as a function of parameter qL and threshold values of this parameter
are found for a variety of cases. Distortions of the structure of director in
comparison with the preferable ideal profile are found via numerical modeling.
Freedericksz transition is studied for this configuration. Coupled-mode theory
is applied to light propagation through such cell allowing to account for
walk-off effects and effects of nematic distortion. In summary, this cell is
suggested as a means for projection display; high efficiency is predicted.

27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc