Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interaction between a Waveguide Mode and an Absorptive Medium   Absorption spectroscopy studies the absorption of electromagnetic wave in a
material sample under test. The interacting electromagnetic wave can be
propagating in free space or in a waveguide. The waveguide-based absorption
spectroscopy method has several advantages compared to the free space setup.
The effect of the waveguide cross section on the interaction between the
waveguide mode and the sample can be expressed by a factor, called interaction
factor. In this article, a new formulation for the interaction factor is
derived. It is shown that this factor is inversely proportional to the energy
velocity of the waveguide mode.

17
The categories of this paper are: q-fin
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The categories of this paper are: stat
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
1
The categories of this paper are: cs