Article

Investigation of nanoscale composition fluctuations in InGaN using optical transmission spectroscopy and near-field scanning optical microscopy

Department of Materials Science and Engineering and Materials Research Center, Northwestern University, Evanston, Illinois 60208
Journal of Applied Physics (impact factor: 2.17). 05/2006; DOI:10.1063/1.2189019 pp.084312 - 084312-6
Source: IEEE Xplore

ABSTRACT Nanoscale composition fluctuations in InGaN alloy epitaxial layers have been investigated by optical transmission spectroscopy and near-field scanning optical microscopy. A spatial variation of the optical transmission at 488 nm is observed, which is attributed to an inhomogeneous indium distribution. Both the characteristic wavelength and the normalized root mean square magnitude of the compositional fluctuations increase with increasing In concentration. The fluctuations are well described in terms of a spinodal decomposition model.

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Keywords

characteristic wavelength
 
compositional fluctuations increase
 
fluctuations
 
inhomogeneous indium distribution
 
Nanoscale composition fluctuations
 
optical transmission
 
optical transmission spectroscopy
 
spatial variation
 
square magnitude