Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral Plasmonic Hydrogen Sensors   In this article, a chiral plasmonic hydrogen-sensing platform using
palladium-based nanohelices is demonstrated. Such 3D chiral nanostructures
fabricated by nanoglancing angle deposition exhibit strong circular dichroism
both experimentally and theoretically. The chiroptical properties of the
palladium nanohelices are altered upon hydrogen uptake and sensitively depend
on the hydrogen concentration. Such properties are well suited for remote and
spark-free hydrogen sensing in the flammable range. Hysteresis is reduced, when
an increasing amount of gold is utilized in the palladium-gold hybrid helices.
As a result, the linearity of the circular dichroism in response to hydrogen is
significantly improved. The chiral plasmonic sensor scheme is of potential
interest for hydrogen-sensing applications, where good linearity and high
sensitivity are required.

5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom