Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Highly efficient optical filter based on vertically coupled Photonic
  crystal cavity and bus waveguide   We experimentally demonstrate a new optical filter design based on a
vertically coupled photonic crystal cavity and a bus waveguide monolithically
integrated on the silicon on insulator platform. The use of a vertically
coupled waveguide gives flexibility in the choice of the waveguide material and
dimensions, dramatically lowering the insertion loss while achieving very high
coupling efficiencies to wavelength scale resonators

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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: stat