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[Prof. Heedeuk Shin] Optical Energy-Difference Conservation in a Synth…

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Journal Physical Review Letters 127, 083601 (2021)
Professor in chargeProf. Heedeuk Shin
Release date2021-08-17

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Caption: Schematic diagram for fiber-based anti-parity-time symmetric system

Optical power changes along the fiber (red and blue line) and Riemann surface with the spontaneous PT-symmetry breaking transition around exceptional point.



Optical Energy-Difference Conservation in a Synthetic Anti-PT-Symmetric System

Anti-parity-time (APT) symmetry is associated with various effects beyond the fundamental limitations implied in the standard Hermitian-Hamiltonian dynamics. Here, we create an optical APT-symmetric system in a synthetic frequency domain using a conventional fiber without intrinsic gain or loss and experimentally reveal photonic APT-symmetric effects, including energy-difference conservation and synchronized power oscillation, which have not yet been confirmed experimentally in the optical domain. The optical fiber-based APT-symmetric system has a long interaction length because of its negligible loss, and the APT-symmetric Hamiltonian is precisely tunable with optical pumping density and phase mismatch. On this basis, we observe the phase transition at exceptional points, energy-difference conservation, and synchronized power oscillation. Our results provide a robust theoretical and experimental framework connecting the emerging non-Hermitian physics with technologically important nonlinear fiber-optic interactions. 


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