Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A passive THz video camera based on lumped element kinetic inductance
  detectors   We have developed a passive 350 GHz (850 {\mu}m) video-camera to demonstrate
lumped element kinetic inductance detectors (LEKIDs) -- designed originally for
far-infrared astronomy -- as an option for general purpose terrestrial
terahertz imaging applications. The camera currently operates at a quasi-video
frame rate of 2 Hz with a noise equivalent temperature difference per frame of
$\sim$0.1 K, which is close to the background limit. The 152 element
superconducting LEKID array is fabricated from a simple 40 nm aluminum film on
a silicon dielectric substrate and is read out through a single microwave
feedline with a cryogenic low noise amplifier and room temperature frequency
domain multiplexing electronics.

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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
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The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: eess