Photoconductive emitters for pulsed terahertz generation

Bacon, David R.; Madéo, Julien; Dani, Keshav M.

doi:10.1088/2040-8986/abf6ba

Cited by 38 publications

(24 citation statements)

References 232 publications

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“…If the photocurrent transient is sufficiently short, then its Fourier transform will contain a substantial bandwidth of components in the THz regime. [74] An effective PCA material will be highly resistive in the dark to reduce heating, have a large breakdown voltage to enable a large bias, a reasonable carrier mobility to enable high currents and a very short carrier lifetime. [74] .…”

Section: Thzmentioning

confidence: 99%

“…[74] An effective PCA material will be highly resistive in the dark to reduce heating, have a large breakdown voltage to enable a large bias, a reasonable carrier mobility to enable high currents and a very short carrier lifetime. [74] . The last point is critical as a shorter pulse will have components covering a larger THz spectral bandwidth.…”

Section: Thzmentioning

confidence: 99%

“…[83] GaAsBi based PCAs are now commercially available. [74] A representative THz power spectrum is shown in Figure 6. [78] Figure 6.…”

Section: Thzmentioning

confidence: 99%

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GaAsBi: From Molecular Beam Epitaxy Growth to Devices

Richards

Bailey

Liu

et al. 2022

Physica Status Solidi (b)

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GaAsBi has been researched as a candidate material for optoelectronic devices for around two decades. Bi-induced localized states induce a rapid rising of the valence band edge through a band anti-crossing interaction, which has a profound effect on the band gap and the spin orbit splitting. The band engineering possible, even with just a few percent bismuth, makes GaAsBi an attractive material for THz emitters, telecommunication lasers, and low noise photodetectors, among other devices. There has been substantial progress in some of these areas; however, progress towards many of the potential applications of GaAsBi has been hindered by device quality issues, brought about by the low substrate temperatures necessary for the growth of GaAsBi with sufficiently large Bi fractions. In this review, we present an overview of the applications for which GaAsBi has been advocated and the key results in these areas. We then explore the molecular beam epitaxy growth and post-growth processing of GaAsBi and the novel techniques that have been suggested to improve material quality. IntroductionReceived: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

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Section: Thzmentioning

confidence: 99%

Section: Thzmentioning

confidence: 99%

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GaAsBi: From Molecular Beam Epitaxy Growth to Devices

Richards

Bailey

Liu

et al. 2022

Physica Status Solidi (b)

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“…In these applications, it is important to use a highly efficient terahertz wave source to improve the performance of the measurement system. Various sources such as photoconductive antenna 5 , non-linear optical crystals 6 , quantum cascade lasers 7 have been developed to emit terahertz wave. Moreover, other sources based on laser plasma interaction 8 , terahertz spintronics 9 and terahertz superconductors 10 are also being investigated.…”

Section: Introductionmentioning

confidence: 99%

Optical thin film coated organic nonlinear crystal for efficient terahertz wave generation

Uchida

Kawauchi

Otake

et al. 2022

Sci Rep

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In the process of terahertz (THz) wave generation via optical rectification of infrared femtosecond pulses in a non-linear optical crystal, the power of terahertz wave is directly proportional to the square of the optical pump power. Therefore, high power terahertz wave can be generated using a high power femtosecond laser provided that the crystal has both high laser induced damage threshold and optical non-linear coefficient. However, a significant amount of pump power is lost in this process due to the Fresnel’s reflection at the air-crystal boundary. In this paper, we numerically and experimentally demonstrate that the coat of optical thin film called Cytop on the 4-N, N-dimethylamino-4’-N’-methyl-stilbazolium tosylate (DAST) crystal effectively reduces the reflection loss of pump power, thereby increasing the THz wave emission efficiency of the DAST crystal. We found that the average power of THz wave emitted by the thin film coated crystal is about 28% higher than the THz power emitted by the uncoated crystal when an equal amount of laser power is used. The thin film coated DAST crystals can be used not only in terahertz measurement systems but also in optical devices such as modulators and waveguides.

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“…6 Immunocompromised patients or patients with a compromised nutritional status are at higher risk of severe exacerbations of odontogenic infections. 9 Identifying and treating these odontogenic infections in an early stage is life-saving. [1][2][3][4] Case fatality rates regularly exceeded over 50% prior to development of antibiotics due to life-threatening complications.…”

Section: Introductionmentioning

confidence: 99%

Case Report: Severe Dental Abscess Complications in Rural Sierra Leone

Roemers¹,

Sesay²,

Sesay³

et al. 2022

The American Journal of Tropical Medicine and Hygiene

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Prevalence data on severe dental infections is scarce, particularly for low-income countries. Patients with dental abscess complications who presented from September 2020 until December 2020 in two hospitals in Tonkolili District, Sierra Leone, were included into this case series. We report on a total of 20 patients, median age 28 years, with severe complications of dental abscesses, with a mortality rate of 45%. This case series illustrates the severity of the dire consequences of the absence of access to basic dental and oral healthcare.

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Photoconductive emitters for pulsed terahertz generation

Cited by 38 publications

References 232 publications

GaAsBi: From Molecular Beam Epitaxy Growth to Devices

GaAsBi: From Molecular Beam Epitaxy Growth to Devices

Optical thin film coated organic nonlinear crystal for efficient terahertz wave generation

Case Report: Severe Dental Abscess Complications in Rural Sierra Leone

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