Exceptional-point-locked PT-symmetric system for ultrasensitive displacement sensing via amplitude readout

Ke Yin; Xianglin Hao; Kaihao Tang; Lu Tan; Tianyu Dong; Huacheng Zhu; Yang Yang

doi:10.1063/5.0296728

Exceptional-point-locked PT-symmetric system for ultrasensitive displacement sensing via amplitude readout

Ke Yin, Xianglin Hao, Kaihao Tang^*, Lu Tan, Tianyu Dong, Huacheng Zhu, Yang Yang

^*Corresponding author for this work

Department of Electrical Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Abstract

PT-symmetric exceptional points (EPs) are singular points where both eigenvalues and eigenvectors become degenerate, and whose bifurcation characteristics have been utilized to design high-sensitivity sensing systems. In this Letter, an amplitude-readout EP-locked displacement sensing system with sensitivity beyond conventional frequency-based methods is proposed. We observed that when a PT-symmetric coupled-resonator reader operates at the EP, the amplitude variation in the gain resonator shows significantly higher sensitivity to LC sensor displacement than the frequency shifts. The amplitude change exhibits a linear dependence on κ_s⁠, significantly simplifying system calibration and enabling more accurate displacement measurements compared to the nonlinear dependence. A printed circuit board-based circuit prototype is built to validate our findings. This work enriches the sensing methodologies based on PT-symmetric EPs, showing potential applications in implanted medical devices, industrial nondestructive testing, etc. © 2026 Author(s). Published under an exclusive license by AIP Publishing.

Original language	English
Article number	013303
Number of pages	5
Journal	Applied Physics Letters
Volume	128
Issue number	1
Online published	5 Jan 2026
DOIs	https://doi.org/10.1063/5.0296728
Publication status	Published - 5 Jan 2026

Funding

This work is supported by the National Natural Science Foundation of China (52407015 and 62571356), the Postdoctoral Fellowship Program of CPSF (GZB20240469), the Natural Science Foundation of Sichuan Province (2023NSFSC1426), the Sichuan University Interdisciplinary Innovation Fund, and the Key Research and Development Program of Shaanxi Province (2024GX-YBXM-236).

Publisher's Copyright Statement

COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article Ke Yin, Xianglin Hao, Kaihao Tang, Lu Tan, Tianyu Dong, Huacheng Zhu, Yang Yang; Exceptional-point-locked PT-symmetric system for ultrasensitive displacement sensing via amplitude readout. Appl. Phys. Lett. 5 January 2026; 128 (1): 013303 and may be found at https://doi.org/10.1063/5.0296728.

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title = "Exceptional-point-locked PT-symmetric system for ultrasensitive displacement sensing via amplitude readout",

abstract = "PT-symmetric exceptional points (EPs) are singular points where both eigenvalues and eigenvectors become degenerate, and whose bifurcation characteristics have been utilized to design high-sensitivity sensing systems. In this Letter, an amplitude-readout EP-locked displacement sensing system with sensitivity beyond conventional frequency-based methods is proposed. We observed that when a PT-symmetric coupled-resonator reader operates at the EP, the amplitude variation in the gain resonator shows significantly higher sensitivity to LC sensor displacement than the frequency shifts. The amplitude change exhibits a linear dependence on κs⁠, significantly simplifying system calibration and enabling more accurate displacement measurements compared to the nonlinear dependence. A printed circuit board-based circuit prototype is built to validate our findings. This work enriches the sensing methodologies based on PT-symmetric EPs, showing potential applications in implanted medical devices, industrial nondestructive testing, etc. {\textcopyright} 2026 Author(s). Published under an exclusive license by AIP Publishing.",

author = "Ke Yin and Xianglin Hao and Kaihao Tang and Lu Tan and Tianyu Dong and Huacheng Zhu and Yang Yang",

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T1 - Exceptional-point-locked PT-symmetric system for ultrasensitive displacement sensing via amplitude readout

AU - Yin, Ke

AU - Hao, Xianglin

AU - Tang, Kaihao

AU - Tan, Lu

AU - Dong, Tianyu

AU - Zhu, Huacheng

AU - Yang, Yang

PY - 2026/1/5

Y1 - 2026/1/5

N2 - PT-symmetric exceptional points (EPs) are singular points where both eigenvalues and eigenvectors become degenerate, and whose bifurcation characteristics have been utilized to design high-sensitivity sensing systems. In this Letter, an amplitude-readout EP-locked displacement sensing system with sensitivity beyond conventional frequency-based methods is proposed. We observed that when a PT-symmetric coupled-resonator reader operates at the EP, the amplitude variation in the gain resonator shows significantly higher sensitivity to LC sensor displacement than the frequency shifts. The amplitude change exhibits a linear dependence on κs⁠, significantly simplifying system calibration and enabling more accurate displacement measurements compared to the nonlinear dependence. A printed circuit board-based circuit prototype is built to validate our findings. This work enriches the sensing methodologies based on PT-symmetric EPs, showing potential applications in implanted medical devices, industrial nondestructive testing, etc. © 2026 Author(s). Published under an exclusive license by AIP Publishing.

AB - PT-symmetric exceptional points (EPs) are singular points where both eigenvalues and eigenvectors become degenerate, and whose bifurcation characteristics have been utilized to design high-sensitivity sensing systems. In this Letter, an amplitude-readout EP-locked displacement sensing system with sensitivity beyond conventional frequency-based methods is proposed. We observed that when a PT-symmetric coupled-resonator reader operates at the EP, the amplitude variation in the gain resonator shows significantly higher sensitivity to LC sensor displacement than the frequency shifts. The amplitude change exhibits a linear dependence on κs⁠, significantly simplifying system calibration and enabling more accurate displacement measurements compared to the nonlinear dependence. A printed circuit board-based circuit prototype is built to validate our findings. This work enriches the sensing methodologies based on PT-symmetric EPs, showing potential applications in implanted medical devices, industrial nondestructive testing, etc. © 2026 Author(s). Published under an exclusive license by AIP Publishing.

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001654127200008

U2 - 10.1063/5.0296728

DO - 10.1063/5.0296728

M3 - RGC 21 - Publication in refereed journal

SN - 0003-6951

VL - 128

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 1

M1 - 013303

ER -

Exceptional-point-locked PT-symmetric system for ultrasensitive displacement sensing via amplitude readout

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