Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrasonic control of terahertz radiation via lattice anharmonicity in
  LiNbO3   We propose a novel tunable terahertz (THz) filter using the resonant
acousto-optic (RAO) effect. We present a design based on a transverse optical
(TO) phonon mediated interaction between a coherent acoustic wave and the THz
field in LiNbO3. We predict a continuously tunable range of the filter up to 4
THz via the variation of the acoustic frequency between 0.1 and 1 GHz. The RAO
effect in this case is due to cubic and quartic anharmonicities between TO
phonons and the acoustic field. The effect of the interference between the
anharmonicities is also discussed.

1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th