Modeling and Analysis of High-Temperature Superconductor Terahertz Photomixers

Saeedkia, Daryoosh; Mansour, R.R.; Safavi-Naeini, S.

doi:10.1109/tasc.2005.850555

Cited by 18 publications

(8 citation statements)

References 26 publications

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“…Terahertz (THz, 0.1 to 10 THz) technology is becoming competitive to existing technologies in various areas like biology, spectroscopy, security, and communication [1][2][3][4][5][6]. The most widely used method to generate THz radiation with a bandwidth of several octaves is photomixing [6][7][8][9]. For continuous-wave generation, it involves mixing of two laser beams that are separated by the desired THz frequency in a photoconductive material in order to generate charge carriers with the beat frequency [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The most widely used method to generate THz radiation with a bandwidth of several octaves is photomixing [6][7][8][9]. For continuous-wave generation, it involves mixing of two laser beams that are separated by the desired THz frequency in a photoconductive material in order to generate charge carriers with the beat frequency [6][7][8][9][10]. The generated charge carriers are collected at the electrodes by applying an external DC bias field or by a built-in internal field and subsequently fed into an antenna.…”

Section: Introductionmentioning

confidence: 99%

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Vivaldi End-Fire Antenna for THz Photomixers

Abdullah

Mukherjee

Kumar

et al. 2020

J Infrared Milli Terahz Waves

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We propose a broadband end-fire antenna for continuous-wave terahertz (THz) photomixing-based devices working in the frequency range of 0.5-1 THz. A compact Vivaldi antenna is presented that does not require any hyper-hemispherical silicon lens to collect and collimate THz radiation unlike the conventionally used broadside antennas. The antenna is tailored to radiate THz into or receive radiation from a dielectric waveguide placed in close vicinity of it. The antenna is fabricated on an indium phosphide (InP) substrate. A silicon (Si) superstrate is used to improve the directionality of the radiated beam. THz power coupled into Si waveguides is measured using two different techniques between 0.1 and 1.15 THz. Firstly, the waveguide is placed in the optical path of a 1550 nm based continuous-wave THz setup with a commercial broadside emitter, focusing optics, and a detector fabricated on the InP substrate with log-periodic broadside antenna. Secondly, the waveguide is placed in direct contact with the designed Vivaldi antenna-based THz receiver and using the commercial broadside emitter as a source. It is observed that the direct coupling technique using the Vivaldi end-fire antenna outperforms the optically coupled approach at frequencies higher than 668 GHz. Efficient THz photoconductive sources and receivers based on the designed compact Vivaldi end-fire antenna will be suitable for launching THz power into on-chip THz circuitry and for compact THz systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vivaldi End-Fire Antenna for THz Photomixers

Abdullah

Mukherjee

Kumar

et al. 2020

J Infrared Milli Terahz Waves

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“…Terahertz photomixing is a heterodyne scheme in which outputs of two singlemode lasers or output modes of a dual-mode laser with their frequency difference falling in the terahertz range mix in a nonlinear medium such as photoconductor or superconductor [9,10]. In fact, photomixers take advantage of both microwave and photonic or superconductive techniques to generate signals in the terahertz frequency range.…”

Section: Introductionmentioning

confidence: 99%

Semi-Analytical Calculation of Terahertz Signal Generated from Photocurrent Radiation in Traveling-Wave Photonic Mixers

Neshat

Saeedkia

Safavi‐Naeini

2008

Int J Infrared Milli Waves

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A semi-analytical method based on distributed source transmission line model is proposed to analyze a traveling-wave terahertz photomixer integrated with a coplanar stripline waveguide. Multilayer spectral domain method along with complex image technique have been applied to calculate the distributed voltage source element in the transmission line representation. To find the coupled terahertz signal along the coplanar stripline, the transmission line equations are solved. The results obtained from the proposed method are verified by the full wave analysis.

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“…Solving the coupled differential equations (2) and (3) with the absorbed optical power given by (1) results in the reduced electron temperature as [7] Te(r, t) = Tdc + Tcos(Qtt-K .r-q5e) Gph = Cph/Te is the phonon mismatch coefficient and Ge-ph= Ce/Te-ph is the electron-phonon coupling coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…The density of the quasiparticles and the Cooper pairs are assumed to be controlled by the electron temperature. The total photocurrent inside the HTS film can be written as [7] J(r, t) = Jd, + Re{jej" }…”

Section: Introductionmentioning

confidence: 99%