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Title: Nanostructured $$\mathrm{GaAs/(Al,Ga)As}$$ Waveguide for Low-Density Polariton Condensation from a Bound State in the Continuum

Journal Article · · Physical Review Applied
 [1];  [2]; ORCiD logo [3];  [3];  [3];  [3];  [3];  [4];  [4];  [5];  [5];  [6]; ORCiD logo [3];  [3];  [3];  [2]
  1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Università del Salento, Lecce (Italy)
  2. CNR Nanotec, Lecce (Italy)
  3. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  4. Università di Pavia (Italy)
  5. Princeton University, NJ (United States)
  6. Università del Salento, Lecce (Italy); CNR Nanotec, Lecce (Italy)

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-the-art polariton condensation threshold in a GaAs/(Al,Ga)As 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Ministry of University and Scientific Research (MIUR); Gordon and Betty Moore Foundations; National Science Foundation (NSF); Swiss National Science Foundation (SNSF); Italian Ministry of Research (MIUR)
Grant/Contract Number:
AC02-05CH11231; 2017P9FJBS 00; GBMF9615; DMR 1420541; P2ELP2 184398
OSTI ID:
1907587
Journal Information:
Physical Review Applied, Vol. 18, Issue 2; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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