Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broadband Extraordinary Transmission in a Single Sub-wavelength Aperture   Coordinate transformation is applied to design an all-dielectric device for
Extraordinary Transmission (ET) in a single sub-wavelength slit. The proposed
device has a broadband feature and can be applied from microwave to visible
frequency bands. Finite-Difference Time-Domain (FDTD) simulations are used to
verify the device's performance. The results show that significantly increased
transmission is achieved through the sub-wavelength aperture from 4 GHz to 8
GHz when the device is applied. In contrast with previously reported systems,
the frequency sensitivity of the new device is very low.

35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin