Room Temperature Exciton-Polariton Condensation in Silicon Metasurfaces Emerging from Bound States in the Continuum

Anton Matthijs Berghuis; Gabriel W Castellanos; Shunsuke Murai; Jose Luis Pura; Diego R Abujetas; Erik van Heijst; Mohammad Ramezani; José A Sánchez-Gil; Jaime Gómez Rivas

doi:10.1021/acs.nanolett.3c01102

Room Temperature Exciton-Polariton Condensation in Silicon Metasurfaces Emerging from Bound States in the Continuum

Nano Lett. 2023 Jun 28;23(12):5603-5609. doi: 10.1021/acs.nanolett.3c01102. Epub 2023 Jun 13.

Authors

Anton Matthijs Berghuis^{1

2}, Gabriel W Castellanos^{1

2}, Shunsuke Murai³, Jose Luis Pura^{4

5}, Diego R Abujetas⁶, Erik van Heijst^{1

2}, Mohammad Ramezani^{1

2}, José A Sánchez-Gil⁵, Jaime Gómez Rivas^{1

2}

Affiliations

¹ Department of Applied Physics and Science Education and Eindhoven Hendrik Casimir Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
² Institute for Complex Molecular Systems-ICMS, Eindhoven University of Technology, P.O. Box 513, 5612 AJ, Eindhoven, The Netherlands.
³ Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo 6158510, Kyoto, Japan.
⁴ GdS-Optronlab, Física de la Materia Condensada, Universidad de Valladolid, Paseo de Belén 19, 47011 Valladolid, Spain.
⁵ Instituto de Estructura de la Materia (IEM-CSIC), Consejo Superior de Investigaciones Científicas, Serrano 121, 28006 Madrid, Spain.
⁶ Physics Department, Fribourg University, Chemin de Musée 3, Fribourg 1700, Switzerland.

Abstract

We show the first experimental demonstration of room-temperature exciton-polariton (EP) condensation from a bound state in the continuum (BIC). This demonstration is achieved by strongly coupling stable excitons in an organic perylene dye with the extremely long-lived BIC in a dielectric metasurface of silicon nanoparticles. The long lifetime of the BIC, mainly due to the suppression of radiation leakage, allows for EP thermalization to the ground state before decaying. This property results in a condensation threshold of less than 5 μJ cm^-2, 1 order of magnitude lower than the lasing threshold reported in similar systems in the weak coupling limit.

Keywords: Bound State in the Continuum; Exciton−Polariton Condensation; Metasurface; Polariton Lasing; Strong Light−Matter Coupling; Surface Lattice Resonance.