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Nonreciprocal Localization of Photons
Hamidreza Ramezani1,2, Pankaj K Jha1, Yuan Wang1,3
1Nanoscale Science and Engineering Center (NSEC), 3112 Etcheverry Hall, University of California, Berkeley, California 94720, USA.
Physical Review Letters
|February 14, 2018
Summary
Researchers achieved nonreciprocal photon localization in a moving photonic lattice. This breakthrough enables directional control of light, impacting photonics, condensed matter, and acoustics for new device applications.
Area of Science:
- Photonics
- Condensed Matter Physics
- Acoustics
Background:
- Spatiotemporal modulation of atomic response creates moving photonic lattices.
- Dispersion in these lattices exhibits a spectral Doppler shift relative to the probe direction.
Purpose of the Study:
- To demonstrate nonreciprocal photon localization in a moving photonic lattice.
- To explore the directional dependence of light localization and frequency shifting.
Main Methods:
- Fabrication of a moving photonic lattice via spatiotemporal modulation of atomic response.
- Introduction of a static defect within the moving lattice.
- Analysis of light propagation and localization phenomena.
Main Results:
- Spatial localization of light within the band gap of the moving lattice was achieved.
- The localized light exhibits a frequency shift dependent on the incident field's direction relative to the lattice motion.
- Demonstrated nonreciprocal behavior in photon localization.
Conclusions:
- Nonreciprocal photon localization in moving photonic lattices is feasible.
- This phenomenon offers potential for novel devices like isolators, circulators, and unidirectional lasers.
- The findings have implications across photonics, condensed matter, and acoustics.
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