Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical imaging of metallic and semiconductor nanostructures at sub
  wavelength regime   The near field scanning optical microscopy (NSOM) is not only a tool for
imaging of objects in the sub wavelength limit but also a prominent
characteristic tool for understanding the intrinsic properties of the
nanostructures. The effect of strong localized surface plasmon resonance
absorption of excitation laser in the NSOM images for Au nanoparticles is
observed. The role of electronic transitions from different native defect
related energy states of AlGaN are also discussed in understanding the NSOM
images for the semiconductor nanowire.

30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin