A loop theory for the input-output problems in cavities
arXiv:2001.01242 · doi:10.1103/PhysRevA.101.043824
Abstract
The input-output formalism is the basis to study the response of an optical cavity to the external stimulations. The existing theories usually handle cavity systems with only one internal mode. However, there is growing interest in more complex systems, especially the hybrid cavity-matter systems, which contains at least two internal modes, one or more from the optical cavity and the matter, respectively. Here we propose a graphical loop theory to calculate and visualize the reflection and transmission spectrum of such multi-mode cavity, resembling the role of Feynman diagrams in the quantum field theory. This loop theory gives a unified picture to interpret the experimental observations on a hybrid magnet-light system, and is extremely easy to apply to arbitrary complicated problems without any calculations.
5 pages, 3 figures
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- Interpreting S-Parameter Spectra in Coupled Resonant Systems: The Role of Probing Configurations
- How to describe collective decay of uncoupled modes in the input-output formalism