Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimizing Nanoparticle Designs to Reach Ideal Light Absorption   Ideal absorption describes a particular means of optimizing light-matter
interactions with a host of potential applications. This work presents new
analytic formulas and describes semi-analytical methods for the design of
electric or magnetic ideal absorption in nanoparticles. These formulas indicate
that ideal absorption is attainable in homogeneous spheres with known materials
at specific sizes and frequencies. They also provide a means of designing
core-shell particles to produce ideal absorption at virtually any frequency in
the visible and near infrared range.

28
The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
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The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
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The categories of this paper are: comp-gas