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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 16 — Aug. 11, 2014
  • pp: 19555–19566

Extraction of absorption coefficients from as-grown GaN nanowires on opaque substrates using all-optical method

R Jayaprakash, D Ajagunna, S Germanis, M Androulidaki, K Tsagaraki, A Georgakilas, and N T Pelekanos  »View Author Affiliations


Optics Express, Vol. 22, Issue 16, pp. 19555-19566 (2014)
http://dx.doi.org/10.1364/OE.22.019555


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Abstract

We demonstrate a new all-optical method to measure absorption coefficients in any family of as-grown nanowires, provided they are grown on a substrate having considerable difference in permittivity with the nanowire-air matrix. In the case of high crystal quality, strain-free GaN nanowires, grown on Si (111) substrates, the extracted absorption coefficients do not exhibit any enhancement compared to bulk GaN values, unlike relevant claims in the literature. This could be attributed to the relatively small diameters, short heights, and high densities of our nanowire arrays.

© 2014 Optical Society of America

OCIS Codes
(080.2720) Geometric optics : Mathematical methods (general)
(100.2960) Image processing : Image analysis
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(130.5990) Integrated optics : Semiconductors
(160.4760) Materials : Optical properties
(300.6470) Spectroscopy : Spectroscopy, semiconductors
(260.2065) Physical optics : Effective medium theory

ToC Category:
Materials

History
Original Manuscript: April 17, 2014
Revised Manuscript: July 3, 2014
Manuscript Accepted: July 4, 2014
Published: August 5, 2014

Citation
R Jayaprakash, D Ajagunna, S Germanis, M Androulidaki, K Tsagaraki, A Georgakilas, and N T Pelekanos, "Extraction of absorption coefficients from as-grown GaN nanowires on opaque substrates using all-optical method," Opt. Express 22, 19555-19566 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-16-19555


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