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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 35, Iss. 6 — Mar. 15, 2010
  • pp: 859–861

Polarized single-lobed surface emission in mid-infrared, photonic-crystal, quantum-cascade lasers

Gangyi Xu, Yannick Chassagneux, Raffaele Colombelli, G. Beaudoin, and I. Sagnes  »View Author Affiliations


Optics Letters, Vol. 35, Issue 6, pp. 859-861 (2010)
http://dx.doi.org/10.1364/OL.35.000859


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Abstract

We report single-mode, surface-emitting, mid-IR, photonic-crystal (PhC), quantum-cascade lasers with linearly polarized and highly directional single-lobed emission. A metallic square-lattice photonic crystal with elliptical air holes and π phase shift was used as the resonator. The 2D feedback coupling—necessary for the operation of the photonic-crystal resonator—is induced by the mismatch between the modes supported by metalized and nonmetalized regions and yields single-mode output with a side-mode suppression ratio > 30 dB . The elliptical air holes modify the relative intensities of the TM field components ( H x and H y ) in the PhC plane, thus yielding linearly polarized emission. The π phase shift allows the system to produce a single-lobed pattern in the far field with a narrow divergence angle ( 2.4 ° × 1.8 ° ) . The emission is perfectly orthogonal to the device surface, and the maximum operating temperature—still limited by the metallic ohmic losses—is 240 K .

© 2010 Optical Society of America

OCIS Codes
(050.5080) Diffraction and gratings : Phase shift
(140.3300) Lasers and laser optics : Laser beam shaping
(230.5440) Optical devices : Polarization-selective devices
(050.5298) Diffraction and gratings : Photonic crystals
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade
(140.7270) Lasers and laser optics : Vertical emitting lasers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: December 3, 2009
Manuscript Accepted: January 27, 2010
Published: March 15, 2010

Citation
Gangyi Xu, Yannick Chassagneux, Raffaele Colombelli, G. Beaudoin, and I. Sagnes, "Polarized single-lobed surface emission in mid-infrared, photonic-crystal, quantum-cascade lasers," Opt. Lett. 35, 859-861 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-6-859

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