Resonant nonlinear studies of trapped 0D‐microcavity polaritons

Nardin, Gaël; Daïf, Ounsi El; Paraïso, Taofiq K.; Baas, Augustin; Richard, Maxime; Morier‐Genoud, F.; Deveaud, B.

doi:10.1002/pssc.200777618

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…All results have been obtained under low power resonant optical pumping, in the linear regime. Nonlinear emission and relaxation of the confined states were, however, demonstrated in previous publications on the same sample, [17][18][19] but are not exploited in the present contribution.…”

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confidence: 58%

Phase-resolved imaging of confined exciton-polariton wave functions in elliptical traps

et al. 2010

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We study the wave functions of exciton polaritons trapped in the elliptical traps of a patterned microcavity. A homodyne detection setup with numerical off-axis filtering allows us to retrieve the amplitude and the phase of the wave functions. Doublet states are observed as the result of the ellipticity of the confinement potential and are successfully compared to even and odd solutions of Mathieu equations. We also show how superpositions of odd and even states can be used to produce "donut" and "eight-shape" states which can be interpreted as polariton vortices.

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Section: Sample Descriptionmentioning

confidence: 58%

Phase-resolved imaging of confined exciton-polariton wave functions in elliptical traps

et al. 2010

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“…This agreement, together with the splitting observed between upper and lower polariton states and the effective confinement observed on both excitonic and photonic components, prove that we have not probed bare optical modes, but the eigenstates of quasiparticles which have a matterwave component. This unique feature leads to very interesting nonlinear responses, [18][19][20] which allow to imagine applications in the field of nonclassical light emission, such as intricated photon pair emission 20 or single photon emitter, 21 for which a full representation of the spatial extension and linewidth of all the eigenstates, as it was presented in this work, is of crucial importance.…”

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Probability density optical tomography of confined quasiparticles in a semiconductor microcavity

Nardin

Paraïso

Cerna

et al. 2009

Applied Physics Letters

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We present the optical tomography of the probability density of quasiparticles, the microcavity polaritons, confined in three dimensions by cylindrical traps. Collecting the photoluminescence emitted by the quasimodes under continuous nonresonant laser excitation, we reconstruct a three-dimensional mapping of the photoluminescence, from which we can extract the spatial distribution of the confined states at any energy. We discuss the impact of the confinement geometry on the wave function patterns and give an intuitive understanding in terms of a light-matter quasiparticle confined in a box. © 2009 American Institute of Physics. ͓DOI: 10.1063/1.3126022͔Probing wave functions or probability densities ͑PDs͒ of confined carriers in semiconductor nanostructures is a very elegant way of retrieving textbook solutions of quantum confinement. It could also provide key information on the coupling between different nanostructures. To confine electrons and holes in semiconductor materials, traps in the nanometer range must be engineered due to the small de Broglie wavelength of the carriers. This reduced size generally prevents the optical imaging of the PDs of charge carriers. Sophisticated techniques such as insertion of probe layers, 1,2 magnetotransport measurements, 3 or magnetotunneling 4 allowed however to reconstruct the spatial variation of confined carrier PDs in the growth ͑vertical͒ direction of a quantum well ͑QW͒. Nevertheless, such techniques are dedicated to the study of PDs along a single confinement axis. They cannot be applied in the case of two-dimensional ͑2D͒ or threedimensional ͑3D͒ confining potentials. The study of the inplane ͑lateral͒ spatial extension of electronic wave functions is generally restricted to metallic surfaces and films, using scanning tunneling microscopy 5,6 or synchrotron radiation. 7The only measurement of fully confined carriers PDs has been achieved using near-field scanning optical microscopy and does not provide a significant resolution to access the spatial variation of the PDs inside the traps. In our work, we take advantage of the coupling between carriers and light in semiconductor microcavities. In the strong coupling regime, the interaction between excitons ͑Coulomb-correlated electron-hole pairs͒ and photons gives rise to the formation of quasiparticles called excitonpolaritons, split in two branches, the upper and lower polaritons.9 Their dispersion, being dominated by the photonic component, gives them an effective mass 10 4 smaller than the free electron mass. Consequently, they can be confined in micrometer-scale traps, above the resolution of optical microscopes. Moreover, as intracavity polaritons are directly coupled to extracavity photons, with energy and momentum conservation, 10 polaritonic states can be directly imaged through optical detection of the photoluminescence ͑PL͒ at the surface of the sample. We previously engineered a GaAs/AlAs microcavity featuring traps for the photonic modes and a single embedded InGaAs quantum well. The traps for the photon...

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Resonant nonlinear studies of trapped 0D‐microcavity polaritons

Cited by 2 publications

References 19 publications

Phase-resolved imaging of confined exciton-polariton wave functions in elliptical traps

Phase-resolved imaging of confined exciton-polariton wave functions in elliptical traps

Probability density optical tomography of confined quasiparticles in a semiconductor microcavity

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