Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Opto-fluidic third order distributed feed-back dye laser   This letter describes the design and operation of a polymer-based third order
distributed feed-back (DFB) microfluidic dye laser. The device relies on
light-confinement in a nano-structured polymer film where an array of
nanofluidic channels is filled by capillary action with a liquid dye solution
which has a refractive index lower than that of the polymer. In combination
with a third order DFB grating, formed by the array of nanofluidic channels,
this yields a low threshold for lasing. The laser is straight-forward to
integrate on Lab-on-a-Chip micro-systems where coherent, tunable light in the
visible range is desired.

17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys