Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-dimensional porous silicon photonic crystal light emitters   We present the design, fabrication and preliminary experiments of
two-dimensional photonic crystal cavities made in nanoporous silicon
luminescent at 700-800 nm. Enhancement in photoluminescence extraction
efficiency at the resonant wavelength is expected due to Purcell effect and
directed radiation pattern defined by the cavity. Such cavities should also
enhance nonlinearities exhibited by porous Si beyond what is observed in
one-dimensional distributed Bragg reflection cavities due to their small mode
volumes and modest quality factors. This design aligns itself well to
integration with conventional silicon based electronics on a single chip.

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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin