High-sensitivity bio-sensor based on the real-splitting indirectly coupled Anti-Parity time symmetric WGMs

TL;DR

This paper introduces a high-sensitivity bio-sensor utilizing Anti-Parity Time symmetric WGMs, achieving enhanced frequency splitting at exceptional points for precise nanoparticle detection.

Contribution

It presents a novel Anti-Parity Time symmetric WGM sensor that exhibits giant frequency splitting enhancement at exceptional points, improving nanoparticle detection sensitivity.

Findings

Giant enhancement in frequency splitting at EP compared to single WGM sensors

Real eigenfrequency splitting allows direct detection

Improved sensitivity for nanoparticle size measurement

Abstract

Detecting the size of single nanoparticle with high precision is crucial to understanding the characteristic of the nanoparticle. In this paper, we research the single particle detection based on the Anti-parity time symmetric (APT) indirectly coupled WGMs. The results show that the Anti-parity time symmetric WGM nanoparticle sensor exhibits giant enhancement in frequency splitting compared with single WGM sensor, when the system operating at exceptional point (EP). With respect to the parity-time symmetric nanoparticle sensor, our research exhibits a real eigenfrequency splitting, which can be directly detected.