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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 24 — Nov. 24, 2008
  • pp: 19447–19461

Quantum cascade lasers with integrated plasmonic antenna-array collimators

Nanfang Yu, Romain Blanchard, Jonathan Fan, Qi Jie Wang, Christian Pflügl, Laurent Diehl, Tadataka Edamura, Masamichi Yamanishi, Hirofumi Kan, and Federico Capasso  »View Author Affiliations

Optics Express, Vol. 16, Issue 24, pp. 19447-19461 (2008)

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We demonstrated in simulations and experiments that by defining a properly designed two-dimensional metallic aperture-grating structure on the facet of quantum cascade lasers, a small beam divergence angle can be achieved in directions both perpendicular and parallel to the laser waveguide layers (denoted as θ⊥ and θ‖, respectively). Beam divergence angles as small as θ⊥=2.7o and θ‖=3.7o have been demonstrated. This is a reduction by a factor of ~30 and ~10, respectively, compared to those of the original lasers emitting at a wavelength of 8.06 µm. The devices preserve good room temperature performance with output power as high as ~55% of that of the original unpatterned lasers. We studied in detail the trade-off between beam divergence and power throughput for the fabricated devices. We demonstrated plasmonic collimation for buried heterostructure lasers and ridge lasers; devices with different waveguide structures but with the same plasmonic collimator design showed similar performance. We also studied a device patterned with a “spider’s web” pattern, which gives us insight into the distribution of surface plasmons on the laser facet.

© 2008 Optical Society of America

OCIS Codes
(120.1680) Instrumentation, measurement, and metrology : Collimation
(240.6680) Optics at surfaces : Surface plasmons
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

Original Manuscript: August 13, 2008
Revised Manuscript: September 19, 2008
Manuscript Accepted: September 21, 2008
Published: November 10, 2008

Nanfang Yu, Romain Blanchard, Jonathan Fan, Qi Jie Wang, Christian Pflügl, Laurent Diehl, Tadataka Edamura, Masamichi Yamanishi, Hirofumi Kan, and Federico Capasso, "Quantum cascade lasers with integrated plasmonic antenna-array collimators," Opt. Express 16, 19447-19461 (2008)

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