Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-dimensional microfabrication through a multimode optical fiber   Additive manufacturing, also known as 3D printing, is an advanced
manufacturing technique that allows the fabrication of arbitrary macroscopic
and microscopic objects. All 3D printing systems require large optical elements
or nozzles in proximity to the built structure. This prevents their use in
applications in which there is no direct access to the area where the objects
have to be printed. Here, we demonstrate three-dimensional microfabrication
based on two-photon polymerization (TPP) with sub diffraction-limited
resolution through an ultra-thin, 50 mm long printing nozzle of 560 micrometers
in diameter. Using wavefront shaping, femtosecond infrared pulses are focused
and scanned through a multimode optical fiber (MMF) inside a photoresist that
polymerizes via two-photon absorption. We show the construction of arbitrary 3D
structures of 500 nm resolution on the other side of the fiber. To our
knowledge, this is the first demonstration of microfabrication through a
multimode optical fiber. Our work represents a new area which we refer to as
endofabrication.

5
The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex