Elliptically-polarised gain in semiconductor microcavities

P. G. Lagoudakis, P. G. Savvidis, J. J. Baumberg, A. I. Tartakovskii, M. S. Skolnick, J. S. Roberts, D. M. Whittaker

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Summary form only given. We report the use of semiconductor microcavities in which both electronic and photonic wavefunctions and their interaction can be specifically manipulated, to produce enormous optical amplification of ultrafast pulses. This relies on the strong coupling of excitons and photons to produce new polaritonic quasiparticles whose nonlinear interactions can be resonantly enhanced. The devices act as vertical cavity parametric amplifiers with an optical pump being efficiently downconverted into the incident signal beam. Unexpectedly, the optimum gain condition is found when the pump pulse is 25% elliptically polarised. This state produces at least double the output compared to either a circular or a linear pump pulse. By scanning through the entire range of pump polarisations, and resolving the polarisation of the emission, we are able to map out the characteristics of this phenomenon, which has also recently been seen for CW excitation. We propose a simple spin-dependent model for the parametric amplification, which infers the presence of a second-order stimulated scattering process that can be as strong as the first order scattering.

Original languageEnglish
Title of host publicationTechnical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages207-208
Number of pages2
ISBN (Electronic)155752663X, 9781557526632
DOIs
Publication statusPublished - 2001
Externally publishedYes
EventQuantum Electronics and Laser Science Conference, QELS 2001 - Baltimore, United States
Duration: 6 May 200111 May 2001

Publication series

NameTechnical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001

Conference

ConferenceQuantum Electronics and Laser Science Conference, QELS 2001
Country/TerritoryUnited States
CityBaltimore
Period6/05/0111/05/01

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