Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design and optimization of optical modulators based on
  graphene-on-silicon nitride microring resonators   In order to overcome the challenge of obtaining high modulation depth due to
weak graphene-light interaction, a graphene-on-silicon nitride (SiNx) microring
resonator based on graphene's gate-tunable optical conductivity is proposed and
studied. Geometrical parameters of graphene-on-SiNx waveguide are
systematically analyzed and optimized, yielding a loss tunability of 0.04
dB/{\mu}m and an effective index variation of 0.0022. We explicitly study the
interaction between graphene and a 40-{\mu}m-radius microring resonator, where
electro-absorptive and electro-refractive modulation are both taken into
account. By choosing appropriate graphene coverage and coupling coefficient, a
high modulation depth of over 40 dB with large fabrication tolerance is
obtained.

28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph