Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-Resonant u-Lasers of Colloidal Quantum Wells Constructed by Direct
  Deep Patterning   Here, the first account of self-resonant fully-colloidal u-lasers made from
colloidal quantum well (CQW) solution is reported. A deep patterning technique
is developed to fabricate well-defined high aspect-ratio on-chip CQW resonators
made of grating waveguides and in-plane reflectors. CQWs of the patterned
layers are closed-packed with sharp edges and residual-free lifted-off
surfaces. Additionally, the method is successfully applied to various
nanoparticles including colloidal quantum dots and metal nanoparticles. It is
observed that the patterning process does not affect the nanocrystals (NCs)
immobilized in the attained patterns and different physical and chemical
properties of the NCs remain pristine. Thanks to capability of the proposed
patterning method, patterns of NCs with sub-wavelength lateral feature size and
micron-scale height are fabricated in the aspect ratios of 1:15 (<100 nm
lateral patterned features to >1.5 {\mu}m film thickness). The fabricated
waveguide-coupled laser, enabling tight optical confinement, assures in-plane
lasing. The spectral characteristics of the designed CQW resonator structure
are well supported with a numerical model of full electromagnetic solutions.
Such directly deep-patterned self-resonant u-lasers of CQWs hold great promise
for on-chip integration to photonic circuits.

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The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org