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Updated: Jun 6, 2025

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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
Published on: January 3, 2016
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Enhanced sensing and broadened absorption with higher-order scattering zeros.
Optics Express
|November 22, 2024
Summary
Non-Hermitian systems enhance measurement sensitivity. A novel optical configuration using coupled microcavities and a sensing protocol based on scattering zeros offers cubic root response and potential for optical absorbers.
Area of Science:
- Quantum optics
- Condensed matter physics
Background:
- Non-Hermitian systems are promising for sensitive measurements.
- Whispering-gallery-mode microcavities offer unique optical properties.
Purpose of the Study:
- To propose a multimode non-Hermitian optical configuration for enhanced sensitivity.
- To develop a sensing protocol utilizing higher-order scattering zeros.
- To explore the potential for high-performance optical absorbers.
Main Methods:
- Designing a three-coupled whispering-gallery-mode microcavity and waveguide system.
- Analyzing the transmission spectrum for scattering zeros and lineshapes.
- Developing a sensing protocol based on higher-order scattering zeros.
Main Results:
- The configuration exhibits higher-order scattering zeros in its transmission spectrum.
- The proposed sensing protocol shows enhanced sensitivity with a cubic root response.
- A sextic lineshape at purely real zeros indicates potential for optical absorbers.
Conclusions:
- Non-Hermitian optical configurations can achieve enhanced sensitivity without eigenbasis collapse.
- The proposed system holds promise for advanced optical sensing and absorption applications.
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