Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dramatic Shape Sensitivity of Directional Emission Patterns from
  Similarly Deformed Cylindrical Polymer Lasers   Recent experiments on similarly shaped polymer micro-cavity lasers show a
dramatic difference in the far-field emission patterns. We show for different
deformations of the ellipse, quadrupole and hexadecapole that the large
differences in the far-field emission patterns is explained by the differing
ray dynamics corresponding to each shape. Analyzing the differences in the
appropriate phase space for ray motion, it is shown that the differing
geometries of the unstable manifolds of periodic orbits are the decisive
factors in determining the far-field pattern. Surprisingly, we find that
strongly chaotic ray dynamics is compatible with highly directional emission in
the far-field.

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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci