Engineering a Light–Matter Strong Coupling Regime in Perovskite-Based Plasmonic Metasurface: Quasi-bound State in the Continuum and Exceptional Points

Abstract

We present theoretically the formation of exciton–photon polaritons and exciton-surface plasmon polaritons in a perovskite-based subwavelength lattice on the metallic plane. It is shown that the later polaritons will be achieved as the perovskite layer is ultra-thin (<50 nm), while the co-existence of both polaritons will dominate, as the thickness of the perovskite metasurface approaches wavelength-scale. In the two cases, the lower polaritonic branches consist of dark and bright modes corresponding to infinite and finite radiative quality factors, respectively. Another salient property in this work is that it allows one to obtain exceptional points (EPs) in momentum space with a four-fold enhancement of local density of states through engineering the perovskite metasurface. Our findings show that the perovskite metasurface is an attractive and rich platform to make polaritonic devices, even with the presence of a lossy metallic layer.

Authors: Le Van, Q. and other authors

Recent News

December 5, 2025

Workshop: Capacity Building for Early Career Researchers

Summary This workshop is designed to build essential research skills among students and early career researchers through focused, practical training in three key areas. The first session explores Open Research practices, including open access publishing, data sharing, and reproducibility, fostering a culture of transparency and collaboration. The second session focuses on Quantitative Research Methods, with […]

December 1, 2025

Seminar: Navigating the ESG Landscape

Implications and Opportunities for Vietnam’s Private Sector in the Era of Global Standards In today’s rapidly shifting global economy, sustainability is no longer a distant ideal – it is a defining force reshaping how companies operate, compete, and grow. Around the world, businesses are navigating an increasingly complex web of ESG standards and climate-related regulations. […]

November 26, 2025

[RECAP] Seminar “Nurturing Your Research Question”

When Every Strong Study Begins with the Right Question On the morning of November 22, 2025, under the coordination of Dr. Phung Thi Viet Bac and Dr. Than Thi Trang Uyen, VinUniversity successfully organized the seminar “Nurturing Your Research Question”, attracting faculty members, researchers, and students interested in research methodology. Opening the session, Prof. […]