Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Selective tuning of optical modes in a silicon comb-like photonic
  crystal cavity   Realizing multiply resonant photonic crystal cavities with large free
spectral range is key to achieve integrated devices with highly efficient
nonlinear response, such as frequency conversion, four-wave mixing, and
parametric oscillation. This task is typically difficult owing to the cavity
modes' sensitivity to fabrication disorder, which makes it hard to reliably
achieve a comb-like spectrum of equally spaced modes even when a perfect
matching is theoretically predicted. Here we show that a comb-like spectrum of
up to 8 modes with very high quality factor and diffraction limited volumes can
be engineered in the bichromatic-type potential of a two-dimensional photonic
crystal cavity fabricated in a thin silicon membrane. To cope with the tight
tolerance in terms of frequency spacings and resonance linewidths, we develop a
permanent post-processing technique that allows the selective tuning of
individual confined modes, thus achieving an almost perfect frequency matching
of high Q resonances with record finesse in silicon microresonators. Our
experimental results are extremely promising in view of ultra-low power
nonlinear photonics in silicon.

25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin