Travelling photons mediated interactions between a magnon mode and a cavity photon mode

Abstract

We systematically study the indirect interaction between a magnon mode and a cavity photon mode mediated by travelling photons of a waveguide. From a general Hamiltonian, we derive the effective coupling strength between two separated modes, and obtain the theoretical expression of system's transmission. Accordingly, we design an experimental set-up consisting of a shield cavity photon mode, microstrip line and a magnon system to test our theoretical predictions. From measured transmission spectra, indirect interaction, as well as mode hybridization, between two modes can be observed. All experimental observations support our theoretical predictions. In this work, we clarify the mechanism of travelling photon mediated interactions between two separate modes. Even without spatial mode overlap, two separated modes can still couple with each other through their correlated dissipations into a mutual travelling photon bus. This conclusion may help us understand the recently discovered dissipative coupling effect in cavity magnonics systems. Additionally, the physics and technique developed in this work may benefit us in designing new hybrid systems based on the waveguide magnonics.

6 papges and 4 figures

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• Single-photon nonreciprocal excitation transfer with non-Markovian retarded effects
• Coherent Microwave Emission of a Gain-Driven Polariton
• Nonreciprocal Multi-mode and Indirect Couplings in Cavity Magnonics
• Controllable optical response and tunable sensing based on self interference in waveguide QED systems
• Enhancing the sensitivity of nonlinearity sensors through homodyne detection in dissipatively coupled systems
• Single-mode magnon-polariton lasing and amplification controlled by dissipative coupling
• Mode attraction in Floquet systems with memory: application to magnonics
• Continuously controllable dissipative and coherent couplings by the interaction between anti-resonance and multiple magnons
• Unveiling photon-photon coupling induced transparency and absorption
• Microwave interference from a spin ensemble and its mirror image in waveguide magnonics
• Realizing on-demand all-to-all selective interactions between distant spin ensembles