Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Centimeter-scale superfine three-dimensional printing with femtosecond
  laser two-photon polymerization   Nowadays three-dimensional (3D) printing has been widely used for producing
geometrically complex 3D structures from a broad range of materials such as
ceramics, metals, polymers, semiconductors, etc. Although it has been
demonstrated that a fabrication resolution as high as ~100 nm can be achieved
in 3D printing based on two photon polymerization (TPP), the end product size
of TPP is typically on millimeter scale limited by the short working distance
of high-numerical-aperture focal lens. Here we present a method based on
simultaneous spatiotemporal focusing (SSTF) of the femtosecond laser pulses
that enables to fabricate centimeter-scale 3D structures of fine features with
TPP. We also demonstrate an isotropic spatial resolution which can be
continuously tuned in the range of ~10 um and ~40 um by only varying the power
of femtosecond laser, making this technique extremely flexible and easy to
implement. We fabricate several Chinese guardian lions of a maximum height of
0.6 cm and a Terra Cotta Warrior of a height of 1.3 cm using this method.

31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol