Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broadband frequency conversion of ultrashort pulses using high-$Q$
  metasurface cavities   Frequency conversion of light can be dramatically enhanced using high quality
factor ($Q$-factor) cavities. Unfortunately, the achievable conversion
efficiencies and conversion bandwidths are fundamentally limited by the
time-bandwidth limit of the cavity, restricting their use in frequency
conversion of ultrashort pulses. Here, we propose and numerically demonstrate
sum-frequency generation based frequency conversion using a metasurface-based
cavity configuration that could overcome this limitation. The proposed
experimental configuration takes use of the spatially dispersive responses of
periodic metasurfaces supporting collective surface lattice resonances (SLRs),
and can be utilized for broadband frequency conversion of ultrashort pulses. We
investigate a plasmonic metasurface, supporting a high-$Q$ SLR ($Q$=500,
linewidth of 2 nm) centred near 1000 nm, and demonstrate ~1000-fold
enhancements of nonlinear signals. Furthermore, we demonstrate broadband
frequency conversion with a pump conversion bandwidth reaching 75 nm, a value
that greatly surpasses the linewidth of the studied cavity. Our work opens new
avenues to utilize high-$Q$ metasurfaces also for broadband frequency
conversion of light.

14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat