Electrically Tunable Surface Plasmon Source for THz Applications

Khoury, Jed; Haji-saeed, Bahareh; Buchwald, Walter R.; Woods, Charles L.; Wentzell, Sandy; Krejca, Brian D.; Kierstead, John

doi:10.1109/jstqe.2010.2049255

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…As an incident radiating THz electromagnetic field is exciting the amplifier; the application of special coupling mechanism such as diffraction based gratings is required to compensate the phase mismatch between the SWCs and the incident wave. As the amplifier input signal is provided by another circuit such as a plasmonic waveguide, the wave impedance of the waveguide should match the amplifier wave impedance (13). Similar impedance matching is also required in the output of the amplifier to avoid any unwanted instabilities and transferring the maximum portion of the amplified signal to the terminating circuit.…”

Section: Discussion Of the Swcs Propagation In An Un-gated 2deg mentioning

confidence: 99%

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Terahertz plasmon amplification using two-dimensional electron-gas layers

Khorrami

El-Ghazaly

et al. 2012

Journal of Applied Physics

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In this study, we present an analytical model to investigate the possibility of guiding and amplifying terahertz (THz) plasmons in a two dimensional electron gas (2DEG) layer of a hetero-structure by applying a bias electric field. This analytical model solves Maxwell equations and semi-classical electronic transport equations inside the biased hetero-structure simultaneously. It is shown that the two dimensional plasmon’s properties alter vastly as the electrons are accelerated by the bias field. Four asymmetric plasmonic modes can propagate inside the un-gated 2DEG layer of the biased hetero-structure. One of these modes in the un-gated 2DEG layer is a growing mode which can be useful in the implementation of THz amplifiers. Since the modes characteristics can be controlled via biasing, design of new plasmonic devices such as modulators and switches is possible by this approach. Similar analysis has been performed in a gated 2DEG layer that shows clear changes in the two dimensional plasmon properties due to the biasing. Unlike the un-gated 2DEG layer, our efforts to find a growing mode in the gated 2DEG layer have failed. These multi-physics models lead to a better understanding of THz plasmonic sources and detectors as well as proposals on new plasmonic devices. Besides, they provide a physical insight into the electron-wave interactions inside the biased hetero-structure.

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Section: Discussion Of the Swcs Propagation In An Un-gated 2deg mentioning

confidence: 99%

“…[7][8][9][10][11][12], and graphene. 13 Lately, novel plasmonic detectors inside 2DEG layers of hetero-structures have been implemented 9,10 that are comparable with the other state of the art THz detectors. Furthermore, different experiments 11,12 have indicated potentials of THz wave radiation from the 2DEG layers.…”

Section: Introductionmentioning

confidence: 99%

Terahertz plasmon amplification using two-dimensional electron-gas layers

Khorrami

El-Ghazaly

et al. 2012

Journal of Applied Physics

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“…optical rectification of a short pulse laser or a surface plasma wave, photoconduction, Cherenkov radiation, etc. [1][2][3][4][5][6][7][8][9]. Presently, there is an increased interest in employing metallic nanostructures and carbon nanotubes to generate THz radiations as these structures offer the advantage of compactness with reasonable efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnetic field on terahertz generation via laser interaction with a carbon nanotube array

Jain¹,

Parashar²,

Kurchania

2013

Int Nano Lett

215

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An amplitude-modulated laser, in the presence of a static magnetic field, interacts with an array of carbon nanotubes embedded on a metallic surface. The laser exerts a ponderomotive force on the free electrons of carbon nanotubes at twice the modulation frequency that falls in the terahertz (THz) range. Each nanotube acts as an oscillatory electric dipole, producing THz radiations. The presence of magnetic field shifts the resonance condition and provides tunability. The THz radiation power increases with magnetic field strength.

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