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Related Concept Videos

Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...

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Related Experiment Video

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

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Imaging with THz quantum cascade lasers using a Schottky diode mixer.

Stefano Barbieri, Jesse Alton, Colin Baker

    Optics Express
    |June 6, 2009
    PubMed
    Summary

    This study presents a novel 2.9 THz imaging system using a quantum cascade laser. The system achieves a 60 dB dynamic range with a 10 microsecond time constant for enhanced imaging capabilities.

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    Last Updated: Jun 22, 2026

    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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    Published on: April 4, 2017

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    Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

    Published on: March 22, 2019

    Area of Science:

    • Terahertz (THz) imaging
    • Quantum cascade laser applications
    • Photonics and optical systems

    Background:

    • Traditional imaging systems face limitations in resolution and dynamic range.
    • Terahertz (THz) radiation offers unique penetration and spectral properties for material analysis.
    • Quantum cascade lasers (QCLs) provide a compact and tunable source for THz applications.

    Purpose of the Study:

    • To develop and demonstrate a novel reflection-based imaging system operating at 2.9 THz.
    • To utilize the mode beating phenomenon in a multimode QCL for enhanced imaging.
    • To evaluate the dynamic range and time response of the proposed THz imaging technique.

    Main Methods:

    • Implementation of a reflection geometry imaging setup.
    • Utilizing a multimode 2.9 THz quantum cascade laser (QCL) as the radiation source.
    • Employing a room temperature point-contact Schottky diode for detecting mode beating and signal mixing.

    Main Results:

    • Successful demonstration of a THz imaging system in reflection mode.
    • Detection of beating between neighboring longitudinal modes of the QCL.
    • Potential for achieving a dynamic range of 60 dB.
    • Achieved a fast time constant of approximately 10 microseconds.

    Conclusions:

    • The developed THz imaging system offers a promising approach for high-performance imaging.
    • The use of QCL mode beating provides a sensitive detection mechanism.
    • The system's dynamic range and speed are suitable for various advanced imaging applications.