Asymmetric light diffraction of an atomic grating with PT symmetry
| Autor: | Yi-Mou Liu, Jin-Hui Wu, Feng Gao, Chu-Hui Fan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Diffraction Holographic grating business.industry Physics::Optics Acousto-optics Electromagnetically induced grating Grating 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics Ultrasonic grating Optics law 0103 physical sciences Blazed grating Physics::Atomic Physics 010306 general physics business Diffraction grating |
| Zdroj: | Optics letters. 42(21) |
| ISSN: | 1539-4794 |
| Popis: | Cold atoms trapped in one-dimensional optical lattices and driven to the four-level N configuration are exploited for achieving an electromagnetically induced grating with parity-time-symmetry. This nontrivial grating exhibits unidirectional diffraction patterns, e.g., with incident probe photons diffracted into either negative or positive angles, depending on the sign relation between spatially modulated absorption and dispersion coefficients. Such asymmetric light diffraction is a result of the out-of-phase interplay of amplitude and phase modulations of transmission function and can be easily tuned via optical depth, probe detuning, pump Rabi frequencies, etc. |
| Databáze: | OpenAIRE |
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