Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High 3rd Order Optical Kerr Nonlinearity of PdSe2 Di-chalcogenide 2D
  Films for Nonlinear Photonic Chips   As a novel layered noble metal dichalcogenide material, palladium diselenide
(PdSe2) has attracted wide interest due to its excellent optical and electronic
properties. In this work, a strong third-order nonlinear optical response of 2D
PdSe2 films is reported. We conduct both open aperture (OA) and closed-aperture
(CA) Z scan measurements with a femtosecond pulsed laser at 800 nm to
investigate the nonlinear absorption and nonlinear refraction, respectively. In
the OA experiment, we observe optical limiting behaviour originating from large
two photo absorption (TPA) in the PdSe2 film of \b{eta} = 3.26 x 10-8 m/W. In
the CA experiment, we measure a peak-valley response corresponding to a large
and negative Kerr nonlinearity of n2 = -1.33 x 10-15 m2/W, two orders of
magnitude larger than bulk silicon. In addition, the variation of n2 as a
function of laser intensity is also characterized, with n2 decreasing in
magnitude when increasing incident laser intensity, becoming saturated at n2 =
-9.96 x 10-16 m2/W at high intensities. Our results show that the extraordinary
third order nonlinear optical properties of PdSe2 have strong potential for
high-performance nonlinear photonic devices.

4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ