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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 36, Iss. 12 — Jun. 15, 2011
  • pp: 2203–2205

High quality factor nitride-based optical cavities: microdisks with embedded GaN/Al(Ga)N quantum dots

M. Mexis, S. Sergent, T. Guillet, C. Brimont, T. Bretagnon, B. Gil, F. Semond, M. Leroux, D. Néel, S. David, X. Chécoury, and P. Boucaud  »View Author Affiliations


Optics Letters, Vol. 36, Issue 12, pp. 2203-2205 (2011)
http://dx.doi.org/10.1364/OL.36.002203


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Abstract

We compare the quality factor values of the whispering gallery modes of microdisks (μ-disks) incorporating GaN quantum dots (QDs) grown on AlN and AlGaN barriers by performing room temperature photoluminescence (PL) spectroscopy. The PL measurements show a large number of high Q factor resonant modes on the whole spectrum, which allows us to identify the different radial mode families and to compare them with simulations. We report a considerable improvement of the Q factor, which reflects the etching quality and the relatively low cavity loss by inserting QDs into the cavity. GaN/AlN QDs-based μ-disks show very high Q values ( Q > 7000 ) whereas the Q factor is only up to 2000 in μ-disks embedding QDs grown on the AlGaN barrier layer. We attribute this difference to the lower absorption below bandgap for AlN barrier layers at the energies of our experimental investigation.

© 2011 Optical Society of America

OCIS Codes
(230.3990) Optical devices : Micro-optical devices
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(230.7020) Optical devices : Traveling-wave devices
(250.5230) Optoelectronics : Photoluminescence
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(350.4238) Other areas of optics : Nanophotonics and photonic crystals

ToC Category:
Optical Devices

History
Original Manuscript: January 20, 2011
Revised Manuscript: May 6, 2011
Manuscript Accepted: May 6, 2011
Published: June 7, 2011

Citation
M. Mexis, S. Sergent, T. Guillet, C. Brimont, T. Bretagnon, B. Gil, F. Semond, M. Leroux, D. Néel, S. David, X. Chécoury, and P. Boucaud, "High quality factor nitride-based optical cavities: microdisks with embedded GaN/Al(Ga)N quantum dots," Opt. Lett. 36, 2203-2205 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-12-2203

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