Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Competition between electronic Kerr and free carrier effects in an
  ultimate-fast optically switched semiconductor microcavity   We have performed ultrafast pump-probe experiments on a GaAs-AlAs microcavity
with a resonance near 1300 nm in the "original" telecom band. We concentrate on
ultimate-fast optical switching of the cavity resonance that is measured as a
function of pump-pulse energy. We observe that at low pump-pulse energies the
switching of the cavity resonance is governed by the instantaneous electronic
Kerr effect and is achieved within 300 fs. At high pump-pulse energies the
index change induced by free carriers generated in the GaAs start to compete
with the electronic Kerr effect and reduce the resonance frequency shift. We
have developed an analytic model which predicts this competition in agreement
with the experimental data. Our model includes a new term in the
intensity-dependent refractive index that considers the effect of the probe
pulse intensity, which is resonantly enhanced by the cavity. We calculate the
effect of the resonantly enhanced probe light on the refractive index change
induced by the electronic Kerr effect for cavities with different quality
factors. By exploiting the linear regime where only the electronic Kerr effect
is observed, we manage to retrieve the nondegenerate third order nonlinear
susceptibility for GaAs from the cavity resonance shift as a function of
pump-pulse energy.

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The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc