Related Experiment Video
Updated: May 17, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Temporally synthesized non-Hermitian imprinting on spin excitation in coherent media
Abstract:
Without requiring parity-time (PT) symmetric optical potential, we explore a memory-based temporal synthesis mechanism for non-Hermitian photon control using electromagnetically induced transparency (EIT). In an N-type EIT system, a dynamic double-lattice configuration can be scheduled to sequentially impose spatially shifted periodic cross-phase modulation and cross-amplitude modulation on the spin excitation via giant Kerr nonlinearity. Passive PT-symmetric imprinting can thus be temporally synthesized in coherent optical memory at low light levels, whereby the PT phase transition of the system is flexibly engineered in the time domain. Using the multiple exposure technique, the PT-symmetric moiré imprinting could be further synthesized to control several equal-intensity diffraction peaks. Our work holds promise for time-dependent non-Hermitian manipulation of the retrieved light.
Related Concept Videos
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
NMR Spectroscopy: Spin–Spin Coupling
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
Atomic Nuclei: Nuclear Relaxation Processes
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

