Generation of Quantized Polaritons below the Condensation Threshold

Cristofolini, Peter; Hatzopoulos, Z.; Savvidis, P. G.; Baumberg, Jeremy J.

doi:10.1103/physrevlett.121.067401

Cited by 8 publications

(9 citation statements)

References 31 publications

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“…Our experiment and modeling suggest that the significant blueshift of the polariton energy at low densities originates from the interactions of the polaritons with the reservoir, rather than solely from polaritonpolariton interactions. At very low densities and pump powers, photon-like polaritons experience a strong quantum confinement effect [24][25][26], which results in quantisation of energy levels which dominates the blueshift as the shape of the trapping barrier changes with the increasing pump power. The quantum confinement effect for exciton-like polaritons in large-area traps is negligible, but the significant shifts of the lowest polariton energy at zero momentum are caused by the rising bottom of the potential trap due to the spreading of the excitonic reservoir.…”

Section: Introductionmentioning

confidence: 99%

Effect of optically induced potential on the energy of trapped exciton polaritons below the condensation threshold

et al. 2019

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Exciton-polaritons (polaritons herein) offer a unique nonlinear platform for studies of collective macroscopic quantum phenomena in a solid state system. Shaping of polariton flow and polariton confinement via potential landscapes created by nonresonant optical pumping has gained considerable attention due to the degree of flexibility and control offered by optically-induced potentials. Recently, large density-dependent energy shifts (blueshifts) exhibited by optically trapped polaritons at low densities, below the bosonic condensation threshold, were interpreted as an evidence of strong polariton-polariton interactions [Nat. Phys. 13, 870 (2017)]. In this work, we further investigate the origins of these blueshifts in optically-induced circular traps and present evidence of significant blueshift of the polariton energy due to reshaping of the optically-induced potential with laser pump power. Our work demonstrates strong influence of the effective potential formed by an optically-injected excitonic reservoir on the energy blueshifts observed below and up to the polariton condensation threshold and suggests that the observed blueshifts arise due to interaction of polaritons with the excitonic reservoir, rather than due to polariton-polariton interaction. arXiv:1808.00749v3 [cond-mat.quant-gas]

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Section: Introductionmentioning

confidence: 99%

Effect of optically induced potential on the energy of trapped exciton polaritons below the condensation threshold

et al. 2019

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“…So far, there have been several studies addressing the potential in nonresonant all-optical control to manipulate the flow of condensate polaritons. This includes planar waveguiding effects [32,33], barricading signals (transistor switches) [26,34], amplification [16,35], and tailoring the condensate momentum distribution [36]. However, to our knowledge, there has been no investigation on planar microlensing of exciton-polaritons.…”

Section: Focal Regionmentioning

confidence: 99%

Reservoir optics with exciton-polariton condensates

et al. 2021

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We investigate an all-optical microscale planar lensing technique based on coherent fluids of semiconductor cavity exciton-polariton condensates. Our theoretical analysis underpins the potential in using state-of-the-art spatial light modulation of nonresonant excitation beams to guide and focus polariton condensates away from their pumping region. The nonresonant excitation profile generates an excitonic reservoir that blueshifts the polariton mode and provides gain, which can be spatially tailored into lens shapes at the microscale to refract condensate waves. We propose several different avenues in controlling the condensate fluid, and demonstrate formation of highly enhanced and localised condensates away from the pumped reservoirs. This opens new perspectives in guiding quantum fluids of light and generating polariton condensates that are shielded from detrimental reservoir dephasing effects.

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“…As the excitonic reservoir behaves as a barrier for polaritons, our two-beam configuration imposes an additional confinement for polaritons in the longitudinal direction of the microrod. Thus, it is possible that this additional quantum confinement will change the energy of the polariton states . What’s more, as pointed out recently by Pieczarka et al, the change of laser power may lead to changes for nonthermalized polariton distribution and thus cause a blueshift in spectroscopic measurements.…”

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confidence: 92%

Polariton–Polariton Interactions Revealed in a One-dimensional Whispering Gallery Microcavity

Cui

Zhou

et al. 2020

Nano Lett.

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Coulomb interactions are essential to the dynamics and optical properties of exciton-polaritons. Here, we report an experimental observation of polariton−polariton interactions far beyond theory in a one-dimensional whispering gallery microcavity. Based on the unique half-light half-matter nature, we were able to clarify the effects of excitons, quantum confinement, and nonthermalized polariton distribution in the measurements of the polaritonic interactions. Spectacularly, our position-scan and power-scan investigations both revealed that the polariton− polariton interaction strength is up to 2 orders of magnitude larger than theoretical predictions. These results suggest that polaritonic interactions are far more complicated than the expectation and should be re-examined in polariton physics and devices involving polaritonic interactions.

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Generation of Quantized Polaritons below the Condensation Threshold

Cited by 8 publications

References 31 publications

Effect of optically induced potential on the energy of trapped exciton polaritons below the condensation threshold

Effect of optically induced potential on the energy of trapped exciton polaritons below the condensation threshold

Reservoir optics with exciton-polariton condensates

Polariton–Polariton Interactions Revealed in a One-dimensional Whispering Gallery Microcavity

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