Constant-output-frequency, octave tuning range backward-wave parametric amplifier

Okwit, S.; Sard, E.

doi:10.1109/t-ed.1961.14874

Cited by 4 publications

(2 citation statements)

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“…Considering a glass as the background medium with permittivity> 1.5, achieving γ = 1.2 would be realistic. For instance, one may use coupled structures with two different lines (possessing different phase velocities) for the input wave and the modulation [30,42,44]. In such structures a modulation velocity greater than at least one of the characteristic velocities involved is required.…”

Section: Discussion On Practical Realization Of Superluminal St Modul...mentioning

confidence: 99%

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Dynamic modulation yields one-way beam splitting

Taravati

Kishk

2019

Phys. Rev. B

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This article 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 is exhibited by the STM slab. Beam splitting is a vital operation for various communication systems, including circuit quantum electrodynamics, and signal-multiplexing and demultiplexhg. Despite 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 semi-coherent 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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Section: Discussion On Practical Realization Of Superluminal St Modul...mentioning

confidence: 99%

“…• At low frequencies, one may use filter constants which are appropriately selected for two weakly coupled transmission lines [18,30,42,44], one for the pump and one for the main incident wave.…”

Section: B Luminal St Modulationmentioning

confidence: 99%