Hybrid Magnonics with Localized Spoof Surface Plasmon Polaritons

TL;DR

This paper introduces a novel spiral resonator supporting spoof localized surface plasmons to enhance photon-magnon coupling in hybrid magnonic systems, demonstrating strong coupling and potential for on-chip applications.

Contribution

The study presents the design and implementation of a spiral resonator supporting spoof LSPs for improved photon-magnon interactions, expanding the engineering capabilities of hybrid magnonic devices.

Findings

Demonstrated strong magnon-LSP photon coupling with yttrium iron garnet sphere.

Showed the dependence of resonator design on photon mode frequency and spatial distribution.

Enhanced magnetic filling factor due to localized photon mode profiles.

Abstract

Hybrid magnonic systems have emerged as a promising direction for information propagation with preserved coherence. Due to high tunability of magnons, their interactions with microwave photons can be engineered to probe novel phenomena based on strong photon-magnon coupling. Improving the photon-magnon coupling strength can be done by tuning the structure of microwave resonators to better interact with the magnon counterpart. Planar resonators have been explored due to their potential for on-chip integration, but only common modes from stripline-based resonators have been used. Here, we present a microwave spiral resonator supporting the spoof localized surface plasmons (LSPs) and implement it to the investigation of photon-magnon coupling for hybrid magnonic applications. We showcase strong magnon-LSP photon coupling using a ferrimagnetic yttrium iron garnet sphere. We discuss the dependence of the spiral resonator design to the engineering capacity of the photon mode frequency and spatial field distributions, via both experiment and simulation. By the localized photon mode profiles, the resulting magnetic field concentrates near the surface dielectrics, giving rise to an enhanced magnetic filling factor. The strong coupling and large engineering space render the spoof LSPs an interesting contender in developing novel hybrid magnonic systems and functionalities.