Indirect Coupling between Two Cavity Photon Systems via Ferromagnetic Resonance

TL;DR

This paper demonstrates experimental indirect coupling between two cavity photon systems mediated by ferromagnetic resonance in YIG, revealing controllable microwave modes with potential applications in optical and information processing devices.

Contribution

It introduces a novel experimental realization of indirect cavity coupling via ferromagnetic resonance and analyzes phase effects using a harmonic oscillator model.

Findings

Some indirectly coupled modes exhibit higher microwave transmission than uncoupled modes.

The coupling can be controlled externally by magnetic field or cavity tuning.

The work suggests potential applications in controllable optical and information processing devices.

Abstract

We experimentally realize indirect coupling between two cavity modes via strong coupling with the ferromagnetic resonance in Yttrium Iron Garnet (YIG). We find that some indirectly coupled modes of our system can have a higher microwave transmission than the individual uncoupled modes. Using a coupled harmonic oscillator model, the influence of the oscillation phase difference between the two cavity modes on the nature of the indirect coupling is revealed. These indirectly coupled microwave modes can be controlled using an external magnetic field or by tuning the cavity height. This work has potential for use in controllable optical devices and information processing technologies.