Nonlinear exceptional nexus with ultra-enhanced signal-to-noise ratio
This study comes from Prof. Duanduan Wan and Prof. Meng Xiao group at the School of Physics of Wuhan University. This work provides a simple while intuitive example by demonstrating with both theory and circuit experiments an “exceptional nexus” (“EX”), a higher-order exceptional point (HOEP). This HOEP is realized within only two coupled resonators with the aid of nonlinear gain. Moreover, such a HOEP exhibits an ultra-enhanced signal-to-noise ratio.
The recent advances in non-Hermitian physics, such as sensitivity enhancement, skin effects, and mode braiding, are underlain by the exceptional points (EPs). Over the last few years, there has been an ongoing debate about whether EPs can improve the sensor’s performance or not.
Possible arguments include stringent parameter requirements, fundamental resolution limits, and noise amplification near the EPs. Facing these challenges, researchers intend to conclude that EPs, even higher-order EPs (HOEPs), enhance responsivity instead of signal-to-noise ratio. Here, this team from Wuhan University shows that such a nonlinearity enabled HOEP exhibits not only diverging responsivity but also diverging signal-to-noise ratio.
Exploring the nonlinear gain saturation in non-Hermitian systems, this team demonstrates with both theory and circuit experiments an exceptional nexus (EX), a HOEP, within only two coupled resonators (see the first image). Intriguingly, the above-mentioned difficulties encountered for other EPs in sensing can be naturally reconciliated due to the exquisite dimension correlation in this nonlinear system. Moreover, the signal-to-noise ratio is significantly improved in the proximity of HOEP (see the second image).
This result can have significant instant impacts on the fundamental understanding of the exceptional singularities of nonlinear non-Hermitian systems, and may open new avenues for applications such as ultrasensitive measurements.
See the article:
Nonlinearity enabled higher-order exceptional singularities with ultra-enhanced signal-to-noise ratio
https://doi.org/10.1093/nsr/nwac259
Journal: National Science Review
DOI: 10.1093/nsr/nwac259
All latest news from the category: Physics and Astronomy
This area deals with the fundamental laws and building blocks of nature and how they interact, the properties and the behavior of matter, and research into space and time and their structures.
innovations-report provides in-depth reports and articles on subjects such as astrophysics, laser technologies, nuclear, quantum, particle and solid-state physics, nanotechnologies, planetary research and findings (Mars, Venus) and developments related to the Hubble Telescope.
Newest articles
Unidirectional imaging technology breakthrough
UCLA researchers developed unidirectional imaging technology, a crucial capability for applications requiring asymmetric visual information processing and optical communication. Traditional imaging systems are bidirectional—if I can see you, you can…
Implantable microparticles can deliver two cancer therapies at once
The combination of phototherapy and chemotherapy could offer a more effective way to fight aggressive tumors. Patients with late-stage cancer often have to endure multiple rounds of different types of…
Researchers Aim To Get Leg Up on Bone Repair with 3D-Printed Femur
University of Texas at Dallas mechanical engineers have designed a 3D-printed femur that could help doctors prepare for surgeries to repair bones and develop treatments for bone tumors. The engineers,…