Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Biomimetic isotropic nanostructures for structural coloration   We describe the self-assembly of biomimetic isotropic films which display
structural color amenable to potential applications in coatings. Isotropic
structures can produce color if there is a pronounced characteristic
length-scale comparable to the wavelength of visible light and
wavelength-independent scattering is suppressed.

6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph