UHF Backward-Wave Parametric Amplifier

Okwit, S.; Grace, M.I.; Sard, E.

doi:10.1109/tmtt.1962.1125567

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…• At ultra-high frequencies, a serpentine transmission line msupports the propagation of the main incident wave [45], which lowers the phase velocity relative to the modulation velocity.…”

Section: B Luminal St Modulationmentioning

confidence: 99%

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: B Luminal St Modulationmentioning

confidence: 99%

Dynamic modulation yields one-way beam splitting

Taravati

Kishk

2019

Phys. Rev. B

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Nonlinear Interaction of Microwave Electric Fields and Sound in LiNbO3

Thompson

Quate

1971

Journal of Applied Physics

130

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The parametric interaction between two oppositely traveling sound waves and a nonspatially varying (k=O) rf electric field in lithium niobate is illustrated in this paper. A pump frequency near 3 GHz is used to parametrically amplify the sound wave at one-half the pump frequency. In addition with a pump field that is sufficiently strong parametric oscillations occur within the crystal and this process forms a method of generating sound waves throughout the crystal volume. Finally, we have found that this type of parametric mixing of two sound waves can be used to obtain convolution signals in real time by monitoring the electric polarization generated within the crystal at twice the signal frequency.

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Parametric coupling between modes of propagation in nonconservative systems

Auld

Comstock²

1967

Proc. IEEE

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UHF Backward-Wave Parametric Amplifier

Cited by 5 publications

References 3 publications

Dynamic modulation yields one-way beam splitting

Dynamic modulation yields one-way beam splitting

Nonlinear Interaction of Microwave Electric Fields and Sound in LiNbO3

Parametric coupling between modes of propagation in nonconservative systems

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