Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Video

Updated: Jun 22, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Surface emitting terahertz quantum cascade laser with a double-metal waveguide.

Jonathan A Fan, Mikhail A Belkin, Federico Capasso

    Optics Express
    |June 17, 2009
    PubMed
    Summary

    We demonstrate efficient surface emission from terahertz quantum cascade lasers using second-order gratings. These novel lasers achieve twice the slope efficiency of traditional edge-emitting devices, offering high-quality single-mode output.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Accurate and scalable deep Maxwell solvers.

    Proceedings of the National Academy of Sciences of the United States of America·2026
    Same author

    Multimode Single-Ring Photonic Molecule.

    Physical review letters·2026
    Same author

    Freeform Mode-Engineered Metasurfaces.

    Nano letters·2026
    Same author

    Free-space optical communications at 4 Gbit/s data rate with a terahertz laser.

    Communications physics·2026
    Same author

    Ultrabroadband Spacetime Nanoscopy of Terahertz Polaritons in a van der Waals Cavity.

    Small (Weinheim an der Bergstrasse, Germany)·2026
    Same author

    3D nanolithography with metalens arrays and spatially adaptive illumination.

    Nature·2025

    Area of Science:

    • Optoelectronics
    • Semiconductor devices
    • Quantum cascade lasers

    Background:

    • Terahertz quantum cascade lasers (TQCLs) are crucial for various applications.
    • Traditional TQCLs often rely on edge-emitting designs, limiting beam quality and integration.
    • Surface emission offers advantages for beam shaping and on-chip integration.

    Purpose of the Study:

    • To implement and investigate surface emission in TQCLs using second-order gratings.
    • To enhance laser performance, specifically slope efficiency and beam characteristics.
    • To compare surface-emitting designs with conventional edge-emitting TQCLs.

    Main Methods:

    • Fabrication of TQCLs with double-metal waveguides incorporating second-order gratings.
    • Design of absorbing edge structures to create anti-reflecting boundary conditions for distributed feedback.

    More Related Videos

    Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
    10:54

    Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

    Published on: July 8, 2013

    Gradient Echo Quantum Memory in Warm Atomic Vapor
    10:00

    Gradient Echo Quantum Memory in Warm Atomic Vapor

    Published on: November 11, 2013

    Related Experiment Videos

    Last Updated: Jun 22, 2026

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
    09:38

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

    Published on: December 18, 2015

    Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
    10:54

    Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

    Published on: July 8, 2013

    Gradient Echo Quantum Memory in Warm Atomic Vapor
    10:00

    Gradient Echo Quantum Memory in Warm Atomic Vapor

    Published on: November 11, 2013

  • Optimization of grating duty cycle to maximize slope efficiency.
  • Characterization of output power, slope efficiency, beam divergence, and spectral behavior.

    • Main Results:

    • Surface emission output powers comparable to edge-emitting devices were achieved.
    • The slope efficiency of surface-emitting lasers was found to be twice that of double-metal edge-emitting structures.
    • Surface-emitting lasers exhibited single-mode behavior.
    • A narrow beam divergence of approximately six degrees was measured for the surface emission.

    Conclusions:

    • Second-order gratings effectively enable efficient surface emission in TQCLs.
    • The developed surface-emitting TQCLs offer superior slope efficiency compared to edge-emitting counterparts.
    • These devices present a promising approach for high-performance, integrated terahertz sources.