Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transfer-printed quantum-dot nanolasers on a silicon photonic circuit   Quantum-dot (QD) nanolasers integrated on a silicon photonic circuit are
demonstrated for the first time. QD nanolasers based on one-dimensional
photonic crystal nanocavities containing InAs/GaAs QDs are integrated on
CMOS-processed silicon waveguides cladded by silicon dioxide. We employed
transfer-printing, whereby the three-dimensional stack of photonic
nanostructures is assembled in a simple pick-and-place manner. Lasing operation
and waveguide-coupling of an assembled single nanolaser are confirmed through
micro-photoluminescence spectroscopy. Furthermore, by repetitive
transfer-printing, two QD nanolasers integrated onto a single silicon waveguide
are demonstrated, opening a path to develop compact light sources potentially
applicable for wavelength division multiplexing.

2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas