Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High contrast optical modulation by surface acoustic waves   Numerical Calculations are employed to study the modulation of light by
surface acoustic waves (SAWs) in photonic band gap (PBG) structures. The on/off
contrast ratio in PBG switch based on optical cavity is determined as a
function of the SAW induced dielectric modulation. We show that these
structures exhibit high contrast ratios even for moderate acousto-optic
coupling

2
The categories of this paper are: math
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph