Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical biosensor based on a photonic crystal with a defective layer
  designed to determine the concentration of SARS-CoV-2 in water   We propose a new optical biosensor based on a photonic crystal with a defect
layer, which can determine the SARS-CoV-2 concentration in water by the defect
mode shift. Two models of the dependence of the refractive index of the defect
layer on the concentration of the pathogen in water were considered. The
optimal parameters for the photonic crystal in our device and the optimal
thickness of the defect layer were determined. It was also demonstrated that in
the presence of absorption in the investigated structure it is much more
advantageous to work in the reflection mode compared to the transmission mode.
Finally, the wavelength dependence of the defect mode on the SARS-CoV-2
concentration was obtained and the sensitivity of the sensor was determined.

11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th