Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dual-optical-comb spectroscopic ellipsometry   Spectroscopic ellipsometry is a means to investigate optical and dielectric
material responses. Conventional spectroscopic ellipsometry has trade-offs
between spectral accuracy, resolution, and measurement time. Polarization
modulation has afforded poor performance due to its sensitivity to mechanical
vibrational noise, thermal instability, and polarization wavelength dependency.
We equip a spectroscopic ellipsometer with dual-optical-comb spectroscopy, viz.
dual-optical-comb spectroscopic ellipsometry (DCSE). The DCSE directly and
simultaneously obtains amplitude and phase information with ultra-high spectral
precision that is beyond the conventional limit. This precision is due to the
automatic time-sweeping acquisition of the interferogram using Fourier
transform spectroscopy and optical combs with well-defined frequency.
Ellipsometric evaluation without polarization modulation also enhances the
stability and robustness of the system. In this study, we evaluate the DCSE of
birefringent materials and thin films, which showed improved spectral accuracy
and a resolution of up to 1.2x10-5 nm across a 5-10 THz spectral bandwidth
without any mechanical movement.

29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th