Reversible and Dynamic Tuning Mechanism for Fabry-Pérot Polaritonic Resonators.

Authors

Zhiqiang Shi, Yongqian Zhao, Ying Liao, Rao Fu, Chen Ge, Shuai Feng, Jianing Chen

Published in

Nanophotonics (Berlin, Germany). Volume 15. Issue 8. Pages e70074. Epub Apr 16, 2026.

Abstract

Polaritons are quasiparticles formed via light-matter interaction (e.g., with electrons or phonons). They confine light to subwavelength scales, enhance electromagnetic fields in Fabry-Pérot polaritonic resonators, and tune cavity resonance via adjusting external parameters (light frequency or dielectric environment). Thus, we propose tuning Fabry-Pérot polaritonic resonators by modifying the dielectric environment through substrate phase transitions. We perform mid-infrared nanoimaging of α-MoO₃ nanocavities on phase-change VO₂ at varying temperatures. At 25°C (VO₂ insulating phase), adjusting incident light frequency tunes the highly sensitive Fabry-Pérot phononic polaritonic resonator order from 10 to 2; at 90°C (VO₂ metallic phase), the order tunes from 7 to 2. With incident light fixed at 992 cm^-1, the α-MoO₃ nanocavity/VO₂ heterojunction undergoes a low-high-low temperature cycle, showing a maximum Fabry-Pérot resonance order change of 3, along with reversible tuning ability and delayed recovery. Simulations indicate higher-order Fabry-Pérot resonant modes can be achieved in thinner and wider α-MoO₃ nanocavities. This method provides new means and experimental support for designing tunable Fabry-Pérot resonant devices.

PMID:
42845926
Bibliographic data and abstract were imported from PubMed on 08 Oct 2026.

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