Enhanced sensitivity at higher-order exceptional points

AbstractHigher-order exceptional points have attracted increased attention in recent years due to their enhanced sensitivity and distinct topological features. Here, we show that non-local acoustic metagratings enabling precise and simultaneous control over their multiple orders of diffraction can serve as a robust platform for investigating higher-order exceptional points in free space. The proposed metagratings, not only could advance the fundamental research of arbitrary order exceptional points, but could also empower unconventional free-space wave manipulation for applications related to sensing and extremely asymmetrical wave control.

Download Full-text

Erratum: Enhanced sensitivity at higher-order exceptional points

Nature ◽

10.1038/nature24024 ◽

2017 ◽

Vol 551 (7682) ◽

pp. 658-658 ◽

Cited By ~ 2

Author(s):

Hossein Hodaei ◽

Absar U. Hassan ◽

Steffen Wittek ◽

Hipolito Garcia-Gracia ◽

Ramy El-Ganainy ◽

...

Keyword(s):

Higher Order ◽

Exceptional Points ◽

Enhanced Sensitivity

Download Full-text

On-chip high sensitivity rotation sensing based on higher-order exceptional points

Journal of the Optical Society of America B ◽

10.1364/josab.36.002618 ◽

2019 ◽

Vol 36 (9) ◽

pp. 2618

Author(s):

Shuo Jiang ◽

Xiaoyang Chang ◽

Wenxiu Li ◽

Peng Han ◽

Yang Zhou ◽

...

Keyword(s):

High Sensitivity ◽

Higher Order ◽

Exceptional Points ◽

Rotation Sensing ◽

On Chip

Download Full-text

HIGHER-ORDER SPECTRA IN NANOPARTICLE GAS SENSORS

Fluctuation and Noise Letters ◽

10.1142/s0219477504002221 ◽

2004 ◽

Vol 04 (04) ◽

pp. L597-L603 ◽

Cited By ~ 6

Author(s):

J. M. SMULKO ◽

J. EDERTH ◽

L. B. KISH ◽

P. HESZLER ◽

C. G. GRANQVIST

Keyword(s):

Gas Sensors ◽

Higher Order ◽

Gas Detection ◽

Enhanced Sensitivity ◽

Sensitivity And Selectivity ◽

Contour Plots ◽

Non Gaussian ◽

Higher Order Spectra ◽

Resistance Fluctuations

It has previously been shown that resistance fluctuations in resistive sensors provide enhanced sensitivity and selectivity for gas detection. We report measurements and analysis of non-Gaussian components in nanoparticle Pd z ( WO 3)1- z film gas sensors, with z being 0.01 or 0.12, in different ambients. These components can be characterized by higher-order spectra. Contour plots are given of bispectra, and plots of integrated bispectra and trispectra. The phase of the integrated higher-order spectra is analyzed as well.

Download Full-text

Fourth order exceptional points with spinning resonators

EPL (Europhysics Letters) ◽

10.1209/0295-5075/ac483c ◽

2022 ◽

Author(s):

Haoye Qin ◽

Yiheng Yin ◽

Ming Ding

Keyword(s):

Fourth Order ◽

Light Propagation ◽

High Efficiency ◽

Optical Resonators ◽

Second Order ◽

Exceptional Points ◽

Enhanced Sensitivity ◽

Order Case ◽

Symmetric Systems

Abstract Investigation of exceptional points mostly focuses on the second order case and employs the gain-involved parity-time (PT) symmetric systems. Here, we propose an approach to implementing fourth order exceptional points (FOEPs) using directly coupled optical resonators with rotation. On resonance, the system manifests FOEP through tuning the spinning velocity to targeted values. Eigenfrequency bifurcation and enhanced sensitivity for nanoparticle have been presented. Also, near FOEP, nonreciprocal light propagation exhibits great boost and dramatic change, which may be applied to high-efficiency isolators and circulators.

Download Full-text