This work demonstrates anti-parity-time symmetric phase transitions and exceptional point singularities in a single-mode optical fiber using off-the-shelf components. Two propagating signals are amplified and coupled through stimulated Brillouin scattering, offering precise control over non-Hermitian parameters. Experimental results show singular response to small-scale variations and topological features around the exceptional point, enabling enhanced response to Brillouin frequency shift changes.
Publisher
Nature Communications
Published On
Jan 20, 2021
Authors
Arik Bergman, Robert Duggan, Kavita Sharma, Moshe Tur, Avi Zadok, Andrea Alù
Tags
anti-parity-time symmetry
phase transitions
exceptional point singularities
optical fiber
stimulated Brillouin scattering
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