Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coupling into the slow light mode in slab-type photonic crystal
  waveguides   Coupling of external light signals into a photonic crystal waveguide becomes
increasingly inefficient as the group velocity of the waveguiding mode slows
down. We have systematically studied the efficiency of coupling in the slow
light regime for samples with different truncations of the photonic lattice at
the coupling interface. Inverse power law dependence is found to best fit the
experimental scaling of the coupling loss on the group index. Coupling
efficiency is found to be significantly improved up to group indices of 100 for
a truncation of the lattice that favors the appearance of the photonic surface
states at the coupling interface in resonance with the slow light mode.

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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: econ