Single mode terahertz quantum cascade amplifier

Ren, Yuan; Wallis, R.; Shah, YD; Jessop, D. S.; Degl’Innocenti, Riccardo; Klimont, Adam; Kamboj, Varun S.; Beere, Harvey E.; Ritchie, D. A.

doi:10.1063/1.4897438

Cited by 19 publications

(10 citation statements)

References 11 publications

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“…All the characteristics of the structure and the coordinate system are depicted in the figure. In our design, the material for the guiding layer is selected as silica (SiO 2 ) due to its excellent transparency and relatively low reflectivity at THz frequencies27. On the other hand, the semiconductor material is chosen as indium antimonide (InSb) because it has a narrow energy gap and a large electron density, which has been demonstrated to support low-loss tightly-confined THz SPP modes28.…”

Section: Resultsmentioning

confidence: 99%

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Subwavelength InSb-based Slot wavguides for THz transport: concept and practical implementations

Zhou

Pištora

et al. 2016

Sci Rep

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Seeking better surface plasmon polariton (SPP) waveguides is of critical importance to construct the frequency-agile terahertz (THz) front-end circuits. We propose and investigate here a new class of semiconductor-based slot plasmonic waveguides for subwavelength THz transport. Optimizations of the key geometrical parameters demonstrate its better guiding properties for simultaneous realization of long propagation lengths (up to several millimeters) and ultra-tight mode confinement (~λ2/530) in the THz spectral range. The feasibility of the waveguide for compact THz components is also studied to lay the foundations for its practical implementations. Importantly, the waveguide is compatible with the current complementary metal-oxide-semiconductor (CMOS) fabrication technique. We believe the proposed waveguide configuration could offer a potential for developing a CMOS plasmonic platform and can be designed into various components for future integrated THz circuits (ITCs).

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Section: Resultsmentioning

confidence: 99%

“…In this paper, SiO 2 is assumed to be temperature-independent and lossless with a refractive index of 2.1 at THz frequencies of interest27. The structure is assumed to be illuminated by a TM-polarized light source.…”

Section: Resultsmentioning

confidence: 99%

Subwavelength InSb-based Slot wavguides for THz transport: concept and practical implementations

Zhou

Pištora

et al. 2016

Sci Rep

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“…In this work [5], we present a novel approach to SM imaging using a 2.9 THz single plasmon QCL, converted into a quantum cascade amplifier (QCA) [6]. We achieve this via the use of an anti-reflection coated (18.5 μm parylene C) high resistivity hyper-hemispherical silicon lens mounted on the laser facet, which fully suppresses lasing action, and creates an optical amplifier.…”

Section: Resultsmentioning

confidence: 99%

Self-mixing imaging using a terahertz quantum cascade amplifier

Wallis

Ren

Jessop

et al. 2015

2015 40th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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We demonstrate a terahertz imaging system utilizing self-mixing in a 2.9 THz quantum cascade amplifier, through the use of an anti-reflection coated silicon lens to completely suppress lasing action. The fully exploited optical gain of the quantum cascade amplifier allows induced voltage perturbations to be spatially mapped with a signal to noise ratio of up to 55 dB and an acquisition rate of up to 20,000 pixels per second.

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“…The achievement of an external and efficient active control of QCL emission, would hence have a great impact in all the aforementioned applications and would help to enlarge the application horizon for this source. The proposed approach combines amplitude/frequency modulators used as fastreconfigurable mirrors in an external cavity configuration with quantum cascade amplifiers (QCA) 11 . The difficulties in realizing THz tunable devices derives from the fact that this frequency range lies between the photonic and electronic range.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial/graphene amplitude and frequency modulators for the active control of terahertz quantum cascade lasers

Degl’Innocenti¹,

Kindness²,

Almond³

et al. 2018

Terahertz Emitters, Receivers, and Applications IX

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Hybrid metamaterial/graphene amplitude and frequency modulators have been implemented as external optoelectronic mirrors in external cavity configurations with terahertz quantum cascade lasers (QCLs). These devices' tunability is accomplished via the interplay between metamaterial resonant units, normally engineered in mm-size arrays, and graphene. The integration of these devices in external cavity QCLs offers unique emission features and realizes an unprecedented studied regime. The implementation of an external amplitude modulation allows the full switching of laser emission in single mode operation by electrostatically gating graphene. The introduction of more dispersive tunable architectures in frequency modulators yields additionally an all-electronic spectral laser bistability.

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Single mode terahertz quantum cascade amplifier

Abstract: A nonlinear analysis of the terahertz serpentine waveguide traveling-wave amplifier Phys. Plasmas 22, 043115 (2015) Room temperature single-mode terahertz sources based on intracavity difference-frequency generation in quantum cascade lasers

Cited by 19 publications

References 11 publications

Subwavelength InSb-based Slot wavguides for THz transport: concept and practical implementations

Subwavelength InSb-based Slot wavguides for THz transport: concept and practical implementations

Self-mixing imaging using a terahertz quantum cascade amplifier

Metamaterial/graphene amplitude and frequency modulators for the active control of terahertz quantum cascade lasers

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