Work

Interpreting S-parameter spectra in coupled resonant systems: the role of probing configurations

Year: 2025

Type: article

Abstract: The S-parameter S 21 is widely used to characterize the resonant properties of various systems. However, we demonstrate that the reliability of S 21 as a true indicator of system resonances depends heavily on the specific probing setup employed. While point-probe or weak probes preserve the integrity of the S 21 spectrum and accurately reflect system resonances, multi-point and strong probes can introduce significant discrepancies. These discrepancies can manifest as misleading features such as repulsive level anti-crossing or attractive level crossing, even in fundamentally uncoupled systems. This highlights the critical importance of selecting appropriate probing techniques to ensure a precise evaluation of system resonances.

Source: Optics Express

DOI: 10.1364/oe.551120

Authors: Jiongjie Wang, Jiang Xiao

Institution: Shanghai Research Center for Quantum Sciences

Language: English

Topic: Quantum chaos and dynamical systems

Subfield: Statistical and Nonlinear Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: National Natural Science Foundation of China, Science and Technology Commission of Shanghai Municipality, National Key Research and Development Program of China