Dynamic modulation yields one-way beam splitting
Dynamic modulation yields one-way beam splitting
This paper demonstrates the realization of an extraordinary beam splitter, exhibiting one-way beam splitting amplification. Such a dynamic beam splitter operates based on nonreciprocal and synchronized photonic transitions in obliquely illuminated space-time-modulated (STM) slabs which impart the coherent temporal frequency and spatial frequency shifts. As a consequence of such unusual photonic transitions, a one-way beam splitting is exhibited by the STM slab. Beam splitting is a vital operation for various communication systems, including circuit quantum electrodynamics, and signal-multiplexing and demultiplexing. Despite that the beam splitting is conceptually a simple operation, the performance characteristics of beam splitters significantly influence the repeatability and accuracy of the entire system. As of today, there has been no approach exhibiting a nonreciprocal beam splitting accompanied with transmission gain and an arbitrary splitting angle. Here, we show that oblique illumination of a periodic and semicoherent dynamically-modulated slab results in coherent photonic transitions between the incident light beam and its counterpart space-time harmonic (STH). Such transitions introduce a unidirectional synchronization and momentum exchange between two STHs with same temporal frequencies but opposite spatial frequencies. Such a beam splitting technique offers high isolation, transmission gain, and zero beam tilting, and is expected to drastically decrease the resource and isolation requirements in communication systems. In addition to the analytical solution, we provide a closed-form solution for the electromagnetic fields in STM structures, and accordingly, investigate the properties of the wave isolation and amplification in subluminal, superluminal, and luminal ST modulations.
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Kishk, Ahmed A.
07e319d7-6a6d-4f10-9656-4cb11e63e25c
1 February 2019
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Kishk, Ahmed A.
07e319d7-6a6d-4f10-9656-4cb11e63e25c
Taravati, Sajjad and Kishk, Ahmed A.
(2019)
Dynamic modulation yields one-way beam splitting.
Physical Review B, 99 (7), [075101].
(doi:10.1103/PhysRevB.99.075101).
Abstract
This paper demonstrates the realization of an extraordinary beam splitter, exhibiting one-way beam splitting amplification. Such a dynamic beam splitter operates based on nonreciprocal and synchronized photonic transitions in obliquely illuminated space-time-modulated (STM) slabs which impart the coherent temporal frequency and spatial frequency shifts. As a consequence of such unusual photonic transitions, a one-way beam splitting is exhibited by the STM slab. Beam splitting is a vital operation for various communication systems, including circuit quantum electrodynamics, and signal-multiplexing and demultiplexing. Despite that the beam splitting is conceptually a simple operation, the performance characteristics of beam splitters significantly influence the repeatability and accuracy of the entire system. As of today, there has been no approach exhibiting a nonreciprocal beam splitting accompanied with transmission gain and an arbitrary splitting angle. Here, we show that oblique illumination of a periodic and semicoherent dynamically-modulated slab results in coherent photonic transitions between the incident light beam and its counterpart space-time harmonic (STH). Such transitions introduce a unidirectional synchronization and momentum exchange between two STHs with same temporal frequencies but opposite spatial frequencies. Such a beam splitting technique offers high isolation, transmission gain, and zero beam tilting, and is expected to drastically decrease the resource and isolation requirements in communication systems. In addition to the analytical solution, we provide a closed-form solution for the electromagnetic fields in STM structures, and accordingly, investigate the properties of the wave isolation and amplification in subluminal, superluminal, and luminal ST modulations.
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Published date: 1 February 2019
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© 2019 American Physical Society.
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Local EPrints ID: 482664
URI: http://eprints.soton.ac.uk/id/eprint/482664
ISSN: 2469-9950
PURE UUID: 87d6c7e2-f909-43ac-aecc-9068998426e1
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Date deposited: 11 Oct 2023 16:50
Last modified: 02 May 2024 02:05
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Author:
Sajjad Taravati
Author:
Ahmed A. Kishk
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