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Designing plasmonic exceptional points by transformation optics.

Xinghong Zhu, Hongfei Wang, Dangyuan Lei

|June 22, 2021

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This study reveals a new way to create sensitive optical properties using exceptional points (EPs) in non-Hermitian systems. These transformed systems offer an alternative route for designing advanced plasmonic devices.

Area of Science:

Non-Hermitian physics
Plasmonics
Transformation optics

Background:

Exceptional points (EPs) enable sensitive optical properties in non-Hermitian systems.
EPs are conventionally achieved in parity-time (PT) symmetric or anti-PT symmetric media.
Applications include highly sensitive nano-sensing in plasmonics.

Purpose of the Study:

To theoretically demonstrate generating non-Hermitian systems with EPs.
To explore an alternative method for designing non-Hermitian plasmonic systems.
To investigate systems that exhibit EPs without conventional PT-symmetry.

Main Methods:

Utilizing the transformation optics framework.
Transforming a seed system with conventional PT-symmetry.

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Spatial operations to modify symmetry properties.

Main Results:

Generated a series of non-Hermitian systems from a PT-symmetric seed.
Transformed systems lack conventional PT-symmetry but possess EPs.
Observed phase transitions in the transformed systems.

Conclusions:

Spatial transformations offer a novel route to EPs in non-Hermitian systems.
This method provides an alternative to conventional PT-symmetry for EP generation.
Enables design of non-Hermitian plasmonic systems with tunable sensitive spectra and eigenmodes.