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Related Experiment Video

Updated: Jun 27, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

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Quantum cascade lasers with integrated plasmonic antenna-array collimators.

Nanfang Yu1, Romain Blanchard, Jonathan Fan

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.

Optics Express
|November 26, 2008
PubMed
Summary
This summary is machine-generated.

We developed a metallic aperture-grating structure for quantum cascade lasers, significantly reducing beam divergence angles. This innovation maintains high output power, offering improved laser performance.

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Last Updated: Jun 27, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Published on: January 3, 2016

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

Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers
  • Plasmonics

Background:

  • Quantum cascade lasers (QCLs) are crucial semiconductor devices.
  • High beam divergence in QCLs limits their application range.
  • Controlling beam quality is essential for advanced laser systems.

Purpose of the Study:

  • To design and experimentally validate a metallic aperture-grating structure for QCLs.
  • To significantly reduce beam divergence in both perpendicular and parallel directions.
  • To investigate the trade-off between beam divergence and optical power.

Main Methods:

  • Simulations and experimental fabrication of two-dimensional metallic aperture-grating structures on QCL facets.
  • Characterization of beam divergence angles (theta perpendicular and theta parallel).
  • Measurement of room-temperature output power and analysis of plasmonic effects.

Main Results:

  • Achieved beam divergence angles as low as theta perpendicular = 2.7 degrees and theta parallel = 3.7 degrees.
  • Demonstrated a reduction in divergence by factors of approximately 30 and 10, respectively.
  • Maintained high room-temperature performance with output power up to 55% of original lasers.

Conclusions:

  • The metallic aperture-grating structure effectively collimates the laser beam.
  • Plasmonic collimation is demonstrated across different QCL waveguide designs.
  • The study provides insights into surface plasmon distribution and device optimization.