Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light Enabled Digital Microfluidics:A Technology Leading to a
  Programmable Lab on a Chip   This fluid dynamics video showcases how optically induced electrowetting can
be used to manipulate liquid droplets in open space and particulate phases
inside the droplet. A photoconductive layer is added to a conventional
electrowetting-on-dielectric (EWOD) structure to generate light enabled virtual
electrodes, hence resulting in an eletrowetting action. Coplanar electrodes
deployed alternately on a substrate enable open droplet manipulations
differentiating from a sandwiched configuration. An integration with an
optoelectric method shows dynamic and rapid particle handling by strong micro
fluidic vortices in conjunction with other electrokinetic forces inside a
droplet. The droplet manipulations are realized with visible illumination and
powered at 150 volts peat-to-peak with a low frequency (100 Hz-800 Hz). The
particle concentration is achieved on the surface of the same chip but
illuminated with a near-infrared (1064 nm) light source and biased with a high
frequency (24 kHz) AC signal.

2
The categories of this paper are: math
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat