Two-photon absorption photocurrent enhancement in bulk AlGaAs semiconductor microcavities
نویسندگان
چکیده
We report on two-photon absorption ~TPA! photocurrent in semiconductor microcavities. We experimentally show a substantial increase in the TPA photocurrent generated, at resonance, in a GaAlAs/GaAs microcavity designed for TPA operation at ;890 nm. An enhancement factor of ;12 000 of the photocurrent is obtained via the microcavity effect, which could have an important impact on the use of TPA devices for high speed switching and sampling applications. Our results also show the implications of the cavity photon lifetime on autocorrelation traces measured using TPA in semiconductor microcavities. © 2002 American Institute of Physics. @DOI: 10.1063/1.1455694#
منابع مشابه
Nonlinear spectroscopy near half-gap in bulk and quantum well GaAs/AlGaAs waveguides
We study the nonlinear properties of bulk AlGaAs and GaAs/AlGaAs multiple quantum wells (MQW) below the half-band-gap energy using subpicosecond pulses between 1.65 and 1.7 pm. In the bulk material we find a value for the nonlinear index IZ~ = +3.6 X lo-l4 cm’/W and a two-photon absorption coefficient p = 0.26 X 10v4 cm/‘MW. In the MQW we measure an n2 up to 2.4 times larger, and we attribute t...
متن کاملObservation of Nondegenerate Two-Photon Gain in GaAs.
Two-photon lasers require materials with large two-photon gain (2PG) coefficients and low linear and nonlinear losses. Our previous demonstration of large enhancement of two-photon absorption in semiconductors for very different photon energies translates directly into enhancement of 2PG. We experimentally demonstrate nondegenerate 2PG in optically excited bulk GaAs via femtosecond pump-probe m...
متن کاملStrong exciton–photon coupling in a low-Q all-metal mirror microcavity
We report the experimental observation of strong exciton–photon coupling in a planar microcavity composed of an organic semiconductor positioned between two metallic ~silver! mirrors. Via transmission and reflectivity measurements, we observe a very large, room temperature Rabi splitting in excess of 300 meV. We show that the Rabi-splitting is enhanced in all-metal microcavities by a factor of ...
متن کاملNondegenerate Two- and Three-Photon Nonlinearities in Semiconductors
Two-photon absorption, 2PA, in semiconductors is enhanced by two orders of magnitude due to intermediate-state resonance enhancement, ISRE, for very nondegenerate (ND) photon energies. Associated with this enhancement in loss is enhancement of the nonlinear refractive index, n2. Even larger enhancement of three-photon absorption is calculated and observed. These large nonlinearities have implic...
متن کاملTwo-photon-enhanced three-photon absorption in transition-metal-doped semiconductor quantum dots
We report the observation of two-photon-enhanced three-photon absorption (3PA) in transition-metal-doped semiconductor quantum dots (d-QDs) in the near-infrared spectral region. Due to the degeneracy between two-photon transitions to the states of metal ions inside the bandgap and three-photon transitions to the excitonic state, the 3PA cross-section is greatly enhanced in comparison with the p...
متن کامل