Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geometric-Phase Waveplates for Free-Form Dark Hollow beams   We demonstrate the possibility to create optical beams with phase
singularities engraved into exotic intensity landscapes imitating the shapes of
a large variety of diverse plane curves. To achieve this aim, we have developed
a method for directly encoding the geometric properties of some selected curve
into a single azimuthal phase factor without passing through indirect
encryption methods based on lengthy numerical procedures. The outcome is
utilized to mould the optic axis distribution of a liquid-crystal-based
inhomogeneous waveplate. The latter is finally used to sculpt the wavefront of
an input optical gaussian beam via Pancharatnam-Berry phase.

22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol