Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Directing random lasing emission using cavity exciton-polaritons   Random lasing is an intriguing phenomenon occurring in disordered structures
with optical gain. In such lasers, the scattering of light provides the
necessary feedback for lasing action. Because of the light scattering, the
random lasing systems emit in all the directions in contrast with the
directional emission of the conventional lasers. While this property can be
desired in some cases, the control of the emission directionality remains
required for most of the applications. Besides, it is well known that the
excitation of cavity exciton-polaritons is intrinsically directional. Each
wavelength (energy) of the cavity polariton, which is a superposition of an
excitonic state and a cavity mode, corresponds to a well-defined propagation
direction. We demonstrate in this article that coupling the emission of a 2D
random laser with a cavity polaritonic resonance permits to control the
direction of emission of the random laser. This results in a directional random
lasing whose emission angle with respect to the microcavity axis can be tuned
in a large range of angles by varying the cavity detuning. The emission angles
reached experimentally in this work are 15.8$^\circ$ and 22.4$^\circ$.

33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess