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Related Experiment Video

Updated: Jun 26, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Active photonic crystal terahertz laser.

A Benz1, Ch Deutsch, G Fasching

  • 1Photonics Institute and Center for Micro- and Nanostructures, Vienna University of Technology, Gusshausstrasse 29/387, A-1040 Vienna, Austria. alexander.benz@tuwien.ac.at

Optics Express
|January 23, 2009
PubMed
Summary

We developed novel active photonic crystal (PhC) semiconductor lasers using quantum cascade structures. These PhC lasers offer tunable, stable single-mode emission without relying on defects, achieving a 400 GHz frequency tuning range.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Physics
  • Laser Technology

Background:

  • Photonic crystals (PhCs) offer unique light manipulation properties.
  • Semiconductor lasers are crucial for various optical applications.
  • Quantum cascade lasers (QCLs) provide specific wavelength emission.

Purpose of the Study:

  • To design and realize active photonic crystal (PhC) semiconductor lasers.
  • To investigate the lasing properties of PhCs in semiconductor nanostructures.
  • To explore defect-free cavity designs for stable laser emission.

Main Methods:

  • Utilizing semiconductor nanostructure pillars for PhC fabrication.
  • Employing a terahertz quantum cascade laser (THz QCL) vertical layer sequence.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Last Updated: Jun 26, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
13:02

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Published on: February 25, 2017

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

  • Using finite-difference time-domain (FDTD) simulations for design validation.
  • Implementing a double-metal waveguide for vertical optical confinement.

    • Main Results:

    • Achieved stable single-mode emission across all driving conditions.
    • Demonstrated lasing in flat-band regions at high symmetry points, avoiding central defects.
    • Observed excellent agreement between experimental results and FDTD simulations.
    • Tuned the laser frequency by 400 GHz by varying the PhC period.

    Conclusions:

    • Active PhC semiconductor lasers can be realized using quantum cascade structures.
    • Defect-free PhC cavities enable stable, single-mode laser operation.
    • The PhC structure itself provides both optical gain and lateral confinement.
    • Tunable laser frequencies are achievable by modifying the PhC lattice parameters.