Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Demonstration of high-Q TE-TM photonic crystal nanobeam cavities   We experimentally demonstrate high Quality factor dual-polarized TE-TM
photonic crystal nanobeam cavities. The free-standing nanobeams are fabricated
in a 500 nm thick silicon layer, and are probed using both tapered optical
fiber and free-space resonant scattering set-ups. We measure Q-factors greater
than 10^4 for both TM and TE modes, and observe large fiber transmission drops
(0.3 -- 0.4) at the TM mode resonances.

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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: math