Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Quantum effects: Light scattering and propagation

Q 39.6: Vortrag

Mittwoch, 20. März 2013, 15:15–15:30, F 342

An optical diode made from a "moving" photonic crystal — •Jörg Evers^1,2, Da-Wei Wang^2,4, Hai-Tao Zhou², Miao-Jun Guo², Jun-Xiang Zhang², and Shi-Yao Zhu^2,3,4 — ¹Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — ²Beijing Computational Science Research Centre, Beijing 100084, China — ³State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China — ⁴Centre of Optics Sciences and Department of Physics, The Chinese University of Hong Kong, Hong Kong, China

Optical diodes controlling the flow of light are of principal significance for optical information processing. They transmit light from an input to an output, but not in reverse direction. This breaking of time reversal symmetry is conventionally achieved via Faraday or non-linear effects. Here we propose an all-optical optical diode which requires neither magnetic fields nor strong input fields. It is based on a "moving" photonic crystal generated in a three-level electromagnetically-induced-transparency medium in which the refractive-index of a weak probe is modulated by the moving periodic intensity of a strong standing coupling field with two detuned counter-propagating components. Due to the Doppler effect, the frequency range of the crystal’s band gap for the probe co-propagating with the moving crystal is shifted from that for the counter-propagating probe. This mechanism is experimentally demonstrated in a room temperature Cs vapour cell.