Low temperature grown photoconductive antennas for pulsed 1060 nm excitation: Influence of excess energy on the electron relaxation

Dietz, R. J. B.; Brahm, A.; Velauthapillai, A.; Wilms, A.; Lammers, C.; Globisch, Björn; Koch, Martin; Notni, Gunther; Tünnermann, Andreas; Göbel, Thorsten; Schell, Martin

doi:10.1007/s10762-014-0119-3

Cited by 13 publications

(6 citation statements)

References 48 publications

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“…One of the first solutions was to employ InGaAs/InAlAs photoconductive layers which allowed achievement of order-of-magnitude improvements versus planar antennas in terms of emission power, dark current and receiver sensitivity [31]. They were applied for continuous wave THz generation at 1.5 µm [32] optical pumping and in TDS using 1 µm wavelength excitation [33]. However, the structures were multi-layered, consisted of 100 periods InGaAs/InAlAs, and, thus, were technologically demanding and expensive for the task at hand.…”

Section: Fiber Femtosecond Laser-based Thz Sourcesmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

191

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In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced power consumption, and increased convenience, thus being geared toward the implementation of THz imaging systems in real operational conditions. The article will touch upon the advanced solid-state-based THz imaging systems, including room temperature THz sensors and arrays, as well as their on-chip integration with diffractive THz optical components. We will cover the current-state of compact room temperature THz emission sources, both optolectronic and electrically driven; particular emphasis is attributed to the beam-forming role in THz imaging, THz holography and spatial filtering, THz nano-imaging, and computational imaging. A number of advanced THz techniques, such as light-field THz imaging, homodyne spectroscopy, and phase sensitive spectrometry, THz modulated continuous wave imaging, room temperature THz frequency combs, and passive THz imaging, as well as the use of artificial intelligence in THz data processing and optics development, will be reviewed. This roadmap presents a structured snapshot of current advances in THz imaging as of 2021 and provides an opinion on contemporary scientific and technological challenges in this field, as well as extrapolations of possible further evolution in THz imaging.

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Section: Fiber Femtosecond Laser-based Thz Sourcesmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

191

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“…107 Additionally, erbium arsenide (ErAs) quantum dot incorporation into the InAlAs trapping layers has been studied and shown to provide up to 1 V∕cm amplitude THz pulses at 100-mW excitation wavelength. 104 The most recent work by Dietz et al 117,118 has shown optimal growth conditions for 1060-nm excitation along with a further study of optimized Be 2þ doping for 1.55-μm excitation detectors. Over 6-THz detection bandwidth and 90-dB dynamic range was reported for detectors fabricated on InGa(Al)As multilayers with Be 2þ doping concentrations of 4 × 10 18 cm −3 .…”

Section: Indium Gallium Arsenidementioning

confidence: 98%

Review of terahertz photoconductive antenna technology

2017

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Photoconductive antennas (PCAs) have been extensively utilized for the generation and detection of both pulsed broadband and single frequency continuous wave terahertz (THz) band radiation. These devices form the basis of many THz imaging and spectroscopy systems, which have demonstrated promising applications in various industries and research fields. The development of THz PCA technology through the last 30 years is reviewed. The key modalities of improving device performance are identified, and literature is reviewed to summarize the progress made in these areas. The goal of this review is to provide a collection of all relevant literature to bring researchers up to date on the current state and remaining challenges of THz PCA technology.

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“…The femtosecond fiber laser pumped IPCA can be a portable and cost-effective solution to a powerful THz transceiver system. Hence, the effect of wavelengths (λ) of 800 nm (Ti:Sapphire laser), 34,35 1060 nm (Ybdoped fiber laser), 36 and 1550 nm (Er-doped fiber lasers) 37 have been studied closely. To the best of our knowledge, this is the first time, the impact of laser pulse parameters on a dense interdigitated photoconductive antenna is reported.…”

Section: Introductionmentioning

confidence: 99%

6G and beyond: Investigation of broadband terahertz interdigitated photoconductive antenna by exploiting laser parameters

Boby

Prajapati

Rathinasamy

et al. 2021

Micro & Optical Tech Letters

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Photoconductive Antennas (PCA) are widely used for terahertz (THz) generation and detection. These PCAs build the basis for future 6G communication as they provide a high data rate and broad bandwidth. In this work, interdigitated photoconductive antenna (IPCA) has been designed and optimized for better performance in terms of THz radiation. The proposed IPCA is made of LT-GaAs substrate material deposited on SI-GaAs. Silver material has been assumed for the IPCA electrode structure. Moreover, the dependence of IPCA on the incident laser parameters such as its wavelength (λ = 800, 1060, and 1550 nm) and pulse duration (100-500 fs) has been investigated theoretically for different teeth widths (W e = 500, 100, 50, and 20 nm). The performance of the IPCA with various parameters such as average carrier density, conductance, total photocurrent, THz radiated power, and electric field strength, has been analyzed. The results show maximum THz electric field strength of 20.85 V/m for a photo-generated current of 1.887 A and enormous bandwidth beyond 14.9 THz with 20 nm teeth-width-based IPCA when illuminated with 100 fs 800 nm laser pulses. The proposed IPCA structure provides enhanced THz radiation compared to conventional PCA. This investigation helps the researchers to develop and integrate IPCA for future wireless communications as well as for a variety of applications, such as time-domain spectroscopy (THz-TDS), medical imaging, sensing, and security-related applications.

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Low temperature grown photoconductive antennas for pulsed 1060 nm excitation: Influence of excess energy on the electron relaxation

Cited by 13 publications

References 48 publications

Roadmap of Terahertz Imaging 2021

Roadmap of Terahertz Imaging 2021

Review of terahertz photoconductive antenna technology

6G and beyond: Investigation of broadband terahertz interdigitated photoconductive antenna by exploiting laser parameters

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