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Non-Hermiticity-Governed Active Photonic Resonances
Jose D H Rivero1,2, Mingsen Pan3, Konstantinos G Makris4,5
1Department of Physics and Astronomy, College of Staten Island, CUNY, Staten Island, New York 10314, USA.
Physical Review Letters
|May 7, 2021
Summary
Researchers discovered novel active photonic resonances in non-Hermitian systems. These resonances, distinct from passive ones, offer continuous tunability with optical gain, paving the way for advanced tunable lasers.
Area of Science:
- Photonics
- Quantum Mechanics
- Optics
Background:
- Photonic resonances are crucial for light generation, propagation, and light-matter interactions in optical devices.
- Non-Hermiticity has been shown to modify passive resonances in open systems, influencing optical properties.
Purpose of the Study:
- To report a new class of resonances in non-Hermitian photonic systems.
- To identify resonances that do not originate from passive resonances.
- To explore their tunability and potential applications in laser technology.
Main Methods:
- Analysis of a unique quantization condition in the non-Hermitian extension of the Wentzel-Kramers-Brillouin (WKB) method.
- Investigation of non-Hermitian systems with spatially correlated complex dielectric functions.
- Exploration of connections to supersymmetry quantum mechanics via Wick rotation.
Main Results:
- Identification of a new type of resonance, termed active photonic resonances, in non-Hermitian systems.
- These active photonic resonances are distinct from passive resonances and arise from specific system properties.
- Continuous frequency shifting of active photonic resonances with increasing optical gain was observed.
Conclusions:
- Active photonic resonances represent a novel phenomenon in non-Hermitian photonics.
- The observed tunability suggests potential for developing on-chip lasers with a broad wavelength range (>100 nm).
- This finding opens new avenues for designing advanced photonic devices and tunable light sources.
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