Terahertz (THz) Frequency Sources and Antennas - A Brief Review

Mukherjee, Prajukta; Gupta, Bhaskar

doi:10.1007/s10762-008-9423-0

Cited by 85 publications

(25 citation statements)

References 40 publications

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“…The THz (=10 12 Hz) is the set of frequencies that lies between the microwave and infrared frequency band. The reason of so much interest in the THz technology is because of the nonionizing nature, high penetration with low attenuation, high‐resolution imaging capability of this signal . As far as antennas in THz range are concerned, a thorough literature survey reveals the use of copper, graphene, and carbon nanotubes (CNTs) as materials for the design .…”

Section: Introductionmentioning

confidence: 99%

Material selection for THz antennas

Dash

Patnaik

2018

Micro & Optical Tech Letters

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THz antennas are gaining interest in many applications. In this article, we compared the performance of THz antennas made up of copper, graphene, and carbon nanotube in a view to choose a suitable material for effective THz antennas. Material properties of these possible materials are analyzed to justify the electromagnetic performance of antennas made out of these materials. A typical dipole antenna with 1THz resonant frequency is used as the candidate antenna to make the comparisons. The graphene antenna shows better electromagnetic performance with their counterparts.

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Section: Introductionmentioning

confidence: 99%

Material selection for THz antennas

Dash

Patnaik

2018

Micro & Optical Tech Letters

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“…However, the development of ultrafast laser technology and progress of semiconductor materials, has increased the efficiency and accuracy of THz technology. THz technology has been widely applied in the field of environmental science, physics, aerospace, security, biomedical, pharmaceutical and materials science [3][4][5][6][7][8][9]. Due to its unique properties, THz wave drew the attentions of researchers.…”

Section: Introductionmentioning

confidence: 99%

Application of Terahertz Spectroscopy and Imaging Techniques in Food Adulteration

Li¹,

Shi²,

Wang³

et al. 2017

dteees

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Abstract. Terahertz (THz) waves lie between millimeter and far-infrared bands, the frequency of which ranges from 100 GHz to 10 THz. Some food materials show featured absorption for THz wave radiation, which can be utilized to characterize different food materials. Compared with other spectral analysis methods, THz spectroscopy has low photon energy and no ionizing radiation. The rapid development of ultrafast laser technology and semiconductor material has enable the further progress of THz techniques in food adulteration. In this review, the principles and applications of THz technology employed in the detection of food adulteration are discussed and the challenges of THz technology in the field of food adulteration are also summarized.

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“…However, terahertz radiation has tremendous potential for various applications such as radio astronomy, terahertz imaging, high-resolution spectroscopy, medicine, security ("body scanner") and defence. [1][2][3][4] During the last years, different methods have been investigated as sources of terahertz radiation. Continuous-wave terahertz sources can be realized by different methods, all with specific strengths and weaknesses (Fig.…”

Section: Introductionmentioning

confidence: 99%

GaN for THz sources

Marso

2011

Quantum Sensing and Nanophotonic Devices VIII

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In this work we investigate two different approaches to generate THz radiation by the use of the unique electrical and thermal properties of GaN. One method is heterodyne photomixing, a compact and inexpensive approach to generate continuous electromagnetic radiation in the terahertz range, with tuneable frequency. It uses two lasers with slightly different wavelengths that illuminate an ultrafast photoconductor. The interference of both laser beams generates a beat frequency of the illumination intensity in the terahertz range. One drawback of the conventionally used LT GaAs as ultrafast photoconductor material is the relatively low THz power in the nW to µW range. The aim of our work is to increase the output power by replacing the LT GaAs with GaN. This semiconductor is rather known as basic material for blue LEDs and lasers, but it has also remarkable electrical and thermal properties that allow higher laser power and bias voltage.A more conventional, electronic approach to generate THz radiation consists in the fabrication of an oscillator circuit based on ultrafast transistors, e.g. Hetero Field Effect Transistors based on InGaAs. These circuits can be designed up to about 100 GHz oscillation frequency. The THz region is achieved by frequency multipliers, e.g. realized by very smallsized Schottky diodes. However, each multiplier stage considerable reduces the output power. In this field we investigate GaN based transistor devices to profit from the much better power performance of this material, compared to classical semiconductors. Devices in this material system are usually used for high power applications at moderate frequencies, but the very high electron saturation velocity of GaN allows the application above 100 GHz as well.

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Terahertz (THz) Frequency Sources and Antennas - A Brief Review

Cited by 85 publications

References 40 publications

Material selection for THz antennas

Material selection for THz antennas

Application of Terahertz Spectroscopy and Imaging Techniques in Food Adulteration

GaN for THz sources

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