Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Designing coupled microcavity lasers for high-Q modes with
  unidirectional light emission   We design coupled optical microcavities and report directional light emission
from high-$Q$ modes for a broad range of refractive indices. The system
consists of a circular cavity that provides a high-$Q$ mode in form of a
whispering gallery mode, whereas an adjacent deformed microcavity plays the
role of a waveguide or collimator of the light transmitted from the circular
cavity. As a result of this very simple, yet robust, concept we obtain high-$Q$
modes with promising directional emission characteristics. No information about
phase space is required, and the proposed scheme can be easily realized in
experiments.

4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat