The advancement of Brillouin Light Scattering with the assistance of nanoplasmonic structures. Enhancement and amplification

TL;DR

This paper proposes a novel active amplification method for Brillouin light scattering using surface electromagnetic resonance in nanoplasmonic structures, potentially increasing sensitivity significantly.

Contribution

It introduces an active energy supply scheme to amplify BLS via SCR, surpassing passive enhancement limits in magnonic systems.

Findings

Potential gain of over an order of magnitude in surface-wave amplitude.

Amplification achieved without increasing primary excitation intensity.

Feasibility supported by recent advances in plasmonics and magnonics.

Abstract

Brillouin light scattering (BLS) is a key technique in studying magnonic systems, but its sensitivity is often limited. While nanoplasmonic systems can enhance BLS through near-field effects, we propose a novel approach for additional amplification. In this conceptual paper, we show how to actively supply energy to a surface collective electromagnetic resonance (SCR) supported by a sparse layer of metal nanoparticles on a magnetic film. Proposed methods are designed to significantly amplify the efficiency of surface-enhanced Brillouin light scattering without increasing the intensity of the primary excitation. In the proposed scheme, the pump extends the propagation length of the SCR, leading directly to BLS amplification. We analyze the conditions for such amplification, with numerical estimates indicating a potential gain of more than an order of magnitude in the surface-wave amplitude. This gain far surpasses the modest increase achievable through passive enhancement alone. These findings outline a practical pathway to achieving BLS amplification in integrated magnonic platforms. The feasibility of the proposed approaches is discussed in light of recent experimental and theoretical advances in plasmonics, magneto-plasmonics, and magnonics.