Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broadband near-infrared antireflection coatings fabricated by three
  dimensional direct laser writing   Three-dimensional direct laser writing via two photon polymerization is used
to fabricate anti-reflective structured surfaces composed of sub-wavelength
conicoid features optimized to operate over a wide bandwidth in the
near-infrared range from 3700 cm$^{-1}$ to 6600 cm$^{-1}$ (2.7 to 1.52 $\mu$m).
Analytic Bruggemann effective medium calculations are used to predict nominal
geometric parameters such as the fill factor of the constitutive conicoid
features of the anti-reflective structured surfaces presented here. The
performance of the anti-reflective structured surfaces was investigated
experimentally using infrared transmission measurements. An enhancement of the
transmittance by 1.35\% to 2.14\% over a broadband spectral range from 3700 cm$
^{-1} $ to 6600 cm$^{-1}$ (2.7 to 1.52 $\mu$m) was achieved. We further report
on finite-element-based reflection and transmission data using
three-dimensional model geometries for comparison. A good agreement between
experimental results and the finite-element-based numerical analysis is
observed once as-fabricated deviations from the nominal conicoid forms are
included in the model. Three-dimensional direct laser writing is demonstrated
here as an efficient method for the fabrication and optimization of
anti-reflective structured surfaces designed for the infrared spectral range.

22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph