Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization degenerate micropillars fabricated by designing elliptical
  oxide apertures   A method for fabrication of polarization degenerate oxide apertured
micropillar cavities is demon- strated. Micropillars are etched such that the
size and shape of the oxide front is controlled. The polarization splitting in
the circular micropillar cavities due to the native and strain induced bire-
fringence can be compensated by elongating the oxide front in the [110]
direction, thereby reducing stress in this direction. By using this technique
we fabricate a polarization degenerate cavity with a quality factor of
1.7*?10^4 and a mode volume of 2.7 u?m3, enabling a calculated maximum Purcell
factor of 11.

24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex