Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transit times of radiation through photonic bandgap materials: Pulse
  reshaping of classical and quantum fields in the time domain   We study the propagation of electromagnetic pulses through photonic bandgap
materials and relate time-domain pulse reshaping to observable transit times.
For layered dielectric mirrors we demonstrate how pulse reshaping of slowly
varying classical fields results in transit-time delays that are equivalent to
the group delay. The time-domain analysis emphasizes the causal origin of
negative group delays. We also study an analogous fully-quantized model and
show how the same time-domain analysis may be used to interpret observed delays
of single-photon fields.

17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ