Annealing of FIB-Induced Defects in GaAs/AlGaAs Heterostructure

Levitskii, I. V.; Mitrofanov, M. I.; Voznyuk, G. V.; Nikolaev, D. N.; Мизеров, М. Н.; Evtikhiev, V. P.

doi:10.1134/s1063782618140178

Cited by 3 publications

(2 citation statements)

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“…Surface recombination can be minimized through oxide removal and surface passivation, achievable through etching at sufficiently low ion energy to remain in the ion-assisted chemical etching regime [41][42][43]. For this reason, the sample was immersed in a hydrochloric acid bath to remove the surface oxide, and then 8nm of Al 2 O 3 were deposited via atomic layer deposition [44][45][46][47] (ALD) at 300°C [48] (see Supplementary Material). The observed emission intensities in the three cases along with the gap size and excitonic fraction are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…the surface with 8nm of Al 2 O 3 conformal layer right after the acid step. The sample was placed in a Oxford FlexAl-Plasma Enhanced Atomic Layer Deposition and kept for 10 minutes at a temperature of 300°C before starting the deposition [48]. The alumina layer was conformally grown all over the sample to reduce the nonradiative recombination rate at the GaAs grating sidewalls [44,46,47].…”

Section: Fabrication and Post-processingmentioning

confidence: 99%

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Fabrication of Nanostructured GaAs/AlGaAs Waveguide for Low-Density Polariton Condensation from a Bound State in the Continuum

Riminucci,

Ardizzone,

Francaviglia

et al. 2022

Preprint

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Exciton-polaritons are hybrid light-matter states that arise from strong coupling between an exciton resonance and a photonic cavity mode. As bosonic excitations, they can undergo a phase transition to a condensed state that can emit coherent light without a population inversion. This aspect makes them good candidates for thresholdless lasers, yet short exciton-polariton lifetime has made it difficult to achieve condensation at very low power densities. In this sense, long-lived symmetry-protected states are excellent candidates to overcome the limitations that arise from the finite mirror reflectivity of monolithic microcavities. In this work we use a photonic symmetry protected bound state in the continuum coupled to an excitonic resonance to achieve state-of-theart polariton condensation threshold in GaAs/AlGaAs waveguide. Most important, we show the influence of fabrication control and how surface passivation via atomic layer deposition provides a way to reduce exciton quenching at the grating sidewalls.

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