Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Embedded Waveguide Structures Fabricated in Porous Silicon by means of
  Lithography   We report the fabrication of diverse light guiding structures embedded in
oxidised porous silicon (OPS) by means of patterned pore filling through a
single photoresist mask. The pores of OPS were filled with KDP salt from
unsaturated solution applied on the sample's surface. Photolithography was used
to create the mask. The created structures include straight, bent and tapered
waveguides of different widths, and Y-splitters. Light guiding was demonstrated
and characterised at wavelength of 1.064 microns.

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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: hep-th
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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: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an