Terahertz technology

Siegel, Peter H.

doi:10.1109/22.989974

Cited by 2,664 publications

(1,106 citation statements)

References 126 publications

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“…Recent progress in sources and detectors is turning what was only recently called the 'terahertz gap' into one of the most rapidly growing technological fields [20][21][22] . At present, highperformance elements to control and manipulate terahertz electromagnetic waves, such as modulators and active filters, are in high demand to develop sophisticated communication and imaging systems.…”

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confidence: 99%

Broadband graphene terahertz modulators enabled by intraband transitions

et al. 2012

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Terahertz technology promises myriad applications including imaging, spectroscopy and communications. However, one major bottleneck at present for advancing this field is the lack of efficient devices to manipulate the terahertz electromagnetic waves. Here we demonstrate that exceptionally efficient broadband modulation of terahertz waves at room temperature can be realized using graphene with extremely low intrinsic signal attenuation. We experimentally achieved more than 2.5 times superior modulation than prior broadband intensity modulators, which is also the first demonstrated graphene-based device enabled solely by intraband transitions. The unique advantages of graphene in comparison to conventional semiconductors are the ease of integration and the extraordinary transport properties of holes, which are as good as those of electrons owing to the symmetric conical band structure of graphene. Given recent progress in graphene-based terahertz emitters and detectors, graphene may offer some interesting solutions for terahertz technologies.

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confidence: 99%

Broadband graphene terahertz modulators enabled by intraband transitions

et al. 2012

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“…Due to the recent progress in THz technology 1,2,3 , the THz studies continue to expand, involving more and more scientists in the development of new sources and detectors of THz radiation, as well as in research on applications of THz waves in different areas. The search for new methods of THz emission and detection and development of simple, compact and inexpensive THz sources and detectors remains a challenging problem.…”

Section: Introductionmentioning

confidence: 99%

“….. Such upconverters, which are commonly based on GaAs Schottky barrier diodes, successfully work as doublers and triplers (m = 2 and 3), but provide very poor conversion efficiency for higher order harmonics (m > 3) 3,4 . The search for alternative nonlinear materials, which could provide efficient frequency multiplication, especially with the upcoversion factor m > 3, is therefore highly desirable.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear electromagnetic response of graphene: frequency multiplication and the self-consistent-field effects

Mikhaǐlov

Ziegler²

2008

J. Phys.: Condens. Matter

391

390

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Graphene is a recently discovered carbon based material with unique physical properties. This is a monolayer of graphite, and the two-dimensional electrons and holes in it are described by the effective Dirac equation with a vanishing effective mass. As a consequence, electromagnetic response of graphene is predicted to be strongly non-linear. We develop a quasi-classical kinetic theory of the non-linear electromagnetic response of graphene, taking into account the self-consistent-field effects. Response of the system to both harmonic and pulse excitation is considered. The frequency multiplication effect, resulting from the non-linearity of the electromagnetic response, is studied under realistic experimental conditions. The frequency up-conversion efficiency is analysed as a function of the applied electric field and parameters of the samples. Possible applications of graphene in terahertz electronics are discussed.

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“…The terahertz frequency range represents a promising alternative as it fills the gap between the far infrared and millimeter wave bands. Several terahertz applications have been proposed for security, biology, medical and imaging systems [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Photomixer Driven Terahertz Dipole Antenna With High Input Resistance and Gain

Yin¹,

Kennedy²,

Sarma³

et al. 2015

PIER M

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Abstract-A terahertz (THz) antenna is proposed that offers high input resistance and gain in the presence of an electrically thick GaAs substrate. The antenna is centrally fed using two vertical probes connected to a photomixer on a thin low temperature grown gallium arsenide (LTG-GaAs) film which is supported by the GaAs substrate. An input impedance of ∼ 3.3 kΩ has been achieved using a dipole antenna that is printed on a thin dielectric slab, and isolated from the supporting substrate using a metal ground plane. A square aperture has been introduced to facilitate the illumination of the photomixer with two laser beams. Furthermore, a frequency selective surface (FSS) has been incorporated in the configuration, which results in a broadside gain of ∼ 19 dBi at a resonance frequency of 0.97 THz.

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Terahertz technology

Cited by 2,664 publications

References 126 publications

Broadband graphene terahertz modulators enabled by intraband transitions

Broadband graphene terahertz modulators enabled by intraband transitions

Nonlinear electromagnetic response of graphene: frequency multiplication and the self-consistent-field effects

A Photomixer Driven Terahertz Dipole Antenna With High Input Resistance and Gain

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