Abstract
The concept of a “trapped rainbow” has generated considerable interest for optical data storage and processing. It aims to trap different frequency components of the wave packet at different positions permanently. However, all the previously proposed structures cannot truly achieve this effect, due to the difficulties in suppressing the reflection caused by strong intermodal coupling and distinguishing different frequency components simultaneously. In this article, we found a physical mechanism to achieve a truly “trapped rainbow” storage of electromagnetic wave. We utilize nonreciprocal waveguides under a tapered magnetic field to achieve this and such a trapping effect is stable even under fabrication disorders. We also observe hot spots and relatively long duration time of the trapped wave around critical positions through frequency domain and time domain simulations. The physical mechanism we found has a variety of potential applications ranging from wave harvesting and storage to nonlinearity enhancement.
Highlights
The concept of a “trapped rainbow” has generated considerable interest for optical data storage and processing
We found a physical mechanism to achieve a truly “trapped rainbow” storage of electromagnetic wave
For the first time in the literature, we found a physical mechanism to achieve a truly “trapped rainbow” storage of electromagnetic wave by simultaneously overcoming these two difficulties, namely, suppressing the reflection of the incident wave and distinguishing different frequency components
Summary
Kexin Liu1,2 & Sailing He1,2 received: 18 May 2016 accepted: 29 June 2016 Published: 25 July 2016. The concept of a “trapped rainbow” has generated considerable interest for optical data storage and processing It aims to trap different frequency components of the wave packet at different positions permanently. The concept of a “trapped rainbow” has generated considerable interest for potential use in optical data storage and processing[7] It aims to trap different frequency components of the wave packet at different positions in space permanently[7]. For the first time in the literature, we found a physical mechanism to achieve a truly “trapped rainbow” storage of electromagnetic wave by simultaneously overcoming these two difficulties, namely, suppressing the reflection of the incident wave and distinguishing different frequency components. We investigate the influences of the loss and the applied magnetic field gradient on the trapping effect
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