Nonlinear modal excitation of coherent plasmonic structures

Alessandro Salandrino; Shima Fardad; Luca Stefanini; Davide Ramaccia; Filiberto Bilotti

doi:10.1117/12.3027212

2 October 2024 Nonlinear modal excitation of coherent plasmonic structures

Alessandro Salandrino, Shima Fardad, Luca Stefanini, Davide Ramaccia, Filiberto Bilotti

Proceedings Volume 13109, Metamaterials, Metadevices, and Metasystems 2024; 131090J (2024) https://doi.org/10.1117/12.3027212
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

Dynamic electromagnetic structures, which vary in both space and time, enable unique operational regimes and effects unattainable in static systems due to modal orthogonality constraints. This paper presents a theoretical framework for intermodal energy transfer in time-varying plasmonic structures. By identifying a suitable mechanism for permittivity modulation, we develop a time-domain formalism to analyze the evolution of the dielectric polarization density in the system. Through a perturbative approach, we derive closed-form solutions that describe the energy transfer between a directly excited dipolar mode and a higher-order subradiant mode. We also demonstrate that the modal amplitudes reach a steady state under optimal modulation conditions, which maximize the amplitude of the high-order mode. Finally, we propose a coherent control strategy to enhance the conversion efficiency to higher-order modes.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Alessandro Salandrino, Shima Fardad, Luca Stefanini, Davide Ramaccia, and Filiberto Bilotti "Nonlinear modal excitation of coherent plasmonic structures", Proc. SPIE 13109, Metamaterials, Metadevices, and Metasystems 2024, 131090J (2 October 2024); https://doi.org/10.1117/12.3027212

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