Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Significant Near Field Enhancement Over Large Volumes Around Metal Nanorods via Strong Coupling of Surface Lattice Resonances and Fabry-Pérot Resonance

Version 1 : Received: 6 January 2022 / Approved: 10 January 2022 / Online: 10 January 2022 (12:05:33 CET)

How to cite: Shi, Y.; Dong, Y.; Sun, D.; Li, G. Significant Near Field Enhancement Over Large Volumes Around Metal Nanorods via Strong Coupling of Surface Lattice Resonances and Fabry-Pérot Resonance. Preprints 2022, 2022010103 (doi: 10.20944/preprints202201.0103.v1). Shi, Y.; Dong, Y.; Sun, D.; Li, G. Significant Near Field Enhancement Over Large Volumes Around Metal Nanorods via Strong Coupling of Surface Lattice Resonances and Fabry-Pérot Resonance. Preprints 2022, 2022010103 (doi: 10.20944/preprints202201.0103.v1).

Abstract

Metal nanoparticles supporting plasmons are widely used to enhance electromagnetic fields, resulting in strong light-matter interactions at the nanoscale in a diverse range of applications. Recently, it has been shown that when metal nanorods are periodically arranged with proper lattice periods, surface lattice resonances (SLRs) can be excited and near fields can be greatly enhanced over extended volumes. In this work, we report significant near field enhancement over even larger volumes by placing the metal nanorod array within a Fabry-Pérot (F-P) microcavity. Results show that taking advantage of strong coupling between the SLR and the photonic F-P resonances, the electric field intensity of the bonding split mode can be enhanced by up to 1935 times, which is about three times of the enhancement of the SLR, and the greatly enhanced field can extend over most of the F-P microcavity. We further show that the F-P resonances of both odd and even orders can strongly couple to the SLR by varying the nanorods position from the middle of the microcavity. We expect that the proposed plasmonic-photonic coupling system will find promising applications in nanolasers, nonlinear optics and sensing.

Keywords

Field enhancement; strong coupling; plasmonic-photonic coupling system; surface lattice resonance; Fabry-Pérot resonance.

Subject

PHYSICAL SCIENCES, Optics

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