Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High bandwidth on-chip capacitive tuning of microtoroid resonators   We report on the design, fabrication and characterization of silica
microtoroid based cavity opto-electromechanical systems (COEMS). Electrodes
patterned onto the microtoroid resonators allow for rapid capacitive tuning of
the optical whispering gallery mode resonances while maintaining their
ultrahigh quality factor, enabling applications such as efficient radio to
optical frequency conversion, optical routing and switching applications.

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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: math-ph
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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: patt-sol
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The categories of this paper are: acc-phys