Novel Waveguides for Terahertz Quantum Cascade Lasers PDF Download
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Author: Adam Klimont
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Languages : en
Pages :
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Author: Adam Klimont
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Languages : en
Pages :
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Author: Owen Peter Marshall
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Languages : en
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Author: Partia Naghibi Mahmoudabadi
Publisher:
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Category :
Languages : en
Pages : 93
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The terahertz region of electromagnetic wave spectrum spanning from 300 GHz to 10 THz (the transition from electronics to photonics) has recently attracted considerable attention based on its numerous applications in different fields. Quantum cascade lasers (QCLs) have been developed in the past ten years as important sources of terahertz radiation. However, there still remain challenges to overcome such as room-temperature operation, efficient out-coupled power and directive radiative beam pattern. Achieving these goals will make THz QCLs very special sources of light to be utilized in broad range of applications in astronomy, biology, medical imaging, etc. This research tackles the aforementioned challenges in two sections. First, it targets the room-temperature issue by focusing on active region engineering and utilizing GaN/AlGaN quantum wells instead of the conventional GaAs/AlGaAs heterostructure QCLs. Second, it introduces a novel approach in waveguide engineering by harnessing the transmission line theory in order to improve the out-coupled power and radiation beam pattern.
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Languages : en
Pages : 11
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Languages : en
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Author: Dan Botez
Publisher: Cambridge University Press
ISBN: 1108570607
Category : Technology & Engineering
Languages : en
Pages : 552
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Learn how the rapidly expanding area of mid-infrared and terahertz photonics has been revolutionized in this comprehensive overview. State-of-the-art practical applications are supported by real-life examples and expert guidance. Also featuring fundamental theory enabling you to improve performance of both existing and future devices.
Author: Tobias Fobbe
Publisher:
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Category :
Languages : en
Pages : 0
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Author: Stephen Michael Kohen
Publisher:
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Category :
Languages : en
Pages : 108
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Finite-element numerical modeling and analysis of electromagnetic waveguides and resonators used in terahertz (THz) quantum cascade lasers (QCLs) is presented. Simulations and analysis of two types were performed: two-dimensional waveguides, and two- and three-dimensional resonators. Both metal-metal and semi-insulating (SI) surface-plasmon geometries were investigated. Waveguide simulations extend previous one-dimensional analyses to two dimensions; resonator simulations in two and three dimensions are presented for the first time. The waveguide simulations quantitatively show when two-dimensional effects become non-negligible in their effect titatively show when two-dimensional effects become non-negligible in their effect on the figure-of-merit relative to previous one-dimensional analyses. The resonator simulations quantitatively show the hybrid optical/microwave nature of THz facet reflectivities, demonstrating that both the effective index method and the impedance mismatch method are poor methods in calculating mirror reflectivities for metal-metal waveguides in the THz region. The effective index method is shown to still be valid for SI surface-plasmon waveguides. In addition, simulated radiation patterns are presented for both waveguiding structures.
Author: Alan Wei Min Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 115
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(cont.) The challenges posed by the long THz wavelengths in QCL waveguide design leads to a tradeoff between high temperature operation (
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Languages : en
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