Reconfigurable exceptional points for adaptive high-precision sensing
Abstract
Exceptional points (EPs) are promising for high-sensitivity sensing due to their unique square-root response to perturbations. Nevertheless, conventional EP sensors suffer from a rapid decay in sensitivity under large perturbations, restricting their practical application. This work proposes a reconfigurable EP sensing scheme based on the four-wave mixing (FWM) mechanism in a circuit. By dynamically tuning the external FWM injection, we recover the system anti-parity-time symmetry and the EP after various bifurcations. Experimental results demonstrate that the reconfigured EP exhibits enhanced sensitivity over a broad range of axial displacement perturbations between the sensor and the magnet target, extending up to 600 μm. The achieved sensitivity is up to over 3.5 times higher than that of the fixed-EP scenario, demonstrating distinct advantages for long-range measurement. This study represents a significant step toward next-generation adaptive high-precision sensors.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (9)
Yusen Yang
State Key Laboratory of Chemical Resource Engineering
Manshi Wang
Department of Optoelectronic Engineering, College of Physics and Optical Engineering, Jinan University 1 , Guangzhou 510632,
Lei Chen
Xiangyang Gong
Department of Optoelectronic Engineering, College of Physics and Optical Engineering, Jinan University 1 , Guangzhou 510632,
Haichuan Li
Department of Optoelectronic Engineering, College of Physics and Optical Engineering, Jinan University 1 , Guangzhou 510632,
Gui-Shi Liu
Department of Optoelectronic Engineering, College of Physics and Optical Engineering, Jinan University 1 , Guangzhou 510632,
Yaofei Chen
Department of Optoelectronic Engineering, College of Physics and Optical Engineering, Jinan University 1 , Guangzhou 510632,
Yunhan Luo
Zhe Chen
Gladstone Institutes, San Francisco, CA, USA.