THz Photoconductive Antennas Made From Ion-Bombarded Semiconductors

Mangeney, J.

doi:10.1007/s10762-011-9848-8

Cited by 23 publications

(9 citation statements)

References 53 publications

(61 reference statements)

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“…Reports have been published on improving the emission characteristics of the terahertz radiation by choosing the semiconductor material [9,10] and by optimizing the photoconductive antenna design. [11][12][13][14] Most studies on photoconductive antennas reported in the literature have thus far used the DC bias coplanar stripline, with little consideration of its effects on the overall performance of the antenna.…”

Section: Introductionmentioning

confidence: 99%

Impact of varying the DC bias stripline connection angle on terahertz coplanar stripline dipole antenna characteristics

Nguyen

Kim²

2013

Journal of Electromagnetic Waves and Applications

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We investigated the dependence of the input impedance and radiation characteristics on the connection angle between the DC bias stripline and the center dipole of a terahertz coplanar stripline dipole antenna in a semi-infinite substrate. Three connection angles, namely 0°(typical horizontal connection), 45°(diagonal connection), and 90°(vertical connection), were examined and an overall performance comparison was provided. The antenna with a sufficiently long bias stripline exhibited a traveling-wave behavior with stable impedance variation, regardless of the connection angle between the DC bias stripline and the center dipole. The antenna with diagonal and vertical bias connections performed much better than the typical H-shaped electrode with a horizontal bias connection in terms of radiation characteristics exhibiting flat gain and low frequency cut-off of the radiation efficiency. In addition, the antenna with a diagonal bias connection exhibited a better radiation pattern and more efficient use of a given substrate area than that with a vertical bias connection. The result indicates that in terms of the overall aspect of the terahertz stripline dipole antenna designs on a high-dielectric-constant substrate, the antenna with a diagonal bias connection is the best configuration.

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Section: Introductionmentioning

confidence: 99%

Impact of varying the DC bias stripline connection angle on terahertz coplanar stripline dipole antenna characteristics

Nguyen

Kim²

2013

Journal of Electromagnetic Waves and Applications

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“…(ii) It is further necessary to reduce the effect of the lifetime roll-off η LT = 1 + (2πτ rec f ) 2 −1 [10], where f is the THz frequency. A particular problem for InGaAs is that most established traps, such as arsenic clusters by low temperature growth, ion-implanted material [14] or ErAs [12] is that the location of the trap states are close to the conduction band edge or even within the conduction band. Due to their fairly high density of states, the trap centers then increase the carrier concentration in the conduction band.…”

Section: Eras:ingaas Photoconductive Receivers Continuous-wave mentioning

confidence: 99%

ErAs Enhanced Active Photonic THz Components

Aller

Lü²,

Gossard

et al. 2018

2018 First International Workshop on Mobile Terahertz Systems (IWMTS)

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We present active, telecom-wavelength compatible THz components with enhanced performance by introducing ErAs precipitates. First, we review how an ErAs monolayer in between p-in diodes enables serial connection of these diodes, reducing the total capacitance and thus decoupling the existing trade-off between RC-and transit time roll-off. In the second part of the paper, latest results with ErAs:In(Al)GaAs photoconductive devices are shown. Continous-wave (CW) receivers show an almost flat frequency response up to 0.5 THz with a noise equivalent power (NEP) of 20±10 fW/Hz. Under pulsed operation, we achieved 40 dB dynamic range at 4.1 THz with a system only using ErAs:In(Al)GaAs photoconductors as source and receiver.

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“…Since many materials are transparent to THz radiation, these items of interest can be observed through visually opaque intervening layers, such as packaging and clothing. Though not strictly a spectroscopic technique, the ultrashort width of the THz radiation pulses allows for measurements (e.g., thickness, density, location of defects) on difficult to probe materials (e.g., foam) [32,33].…”

Section: Conductivitiesmentioning

confidence: 99%

Terahertz Spectroscopy for Gastrointestinal Cancer Diagnosis

Wahaia¹,

Kašalynas²,

Valušis³

et al. 2017

Terahertz Spectroscopy - A Cutting Edge Technology

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In this chapter, we present a number of sensitive measurement modalities for the study and analysis of human cancer-affected colon and gastric tissue using terahertz (THz) spectroscopy. Considerable advancements have been reached in characterization of bio-tissue with some accuracy, although too dawn, and still long and exhaustive work have to be done towards well-established and reliable applications. The advent of the THz-time-domain spectroscopy (THz-TDS) test modality at a sub-picosecond time resolution has arguably fostered an intensive work in this field's research line. The chapter addresses some basic theoretical aspects of this measurement modality with the presentation of general experimental laboratory setup diagrams for THz generation and detection, sample preparation aspects, samples optical parameters calculation procedures and data analysis.

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THz Photoconductive Antennas Made From Ion-Bombarded Semiconductors

Cited by 23 publications

References 53 publications

Impact of varying the DC bias stripline connection angle on terahertz coplanar stripline dipole antenna characteristics

Impact of varying the DC bias stripline connection angle on terahertz coplanar stripline dipole antenna characteristics

ErAs Enhanced Active Photonic THz Components

Terahertz Spectroscopy for Gastrointestinal Cancer Diagnosis

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