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

B. Han; B. W. Wessels; M. P. Ulmer

doi:10.1063/1.2189019

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

B. Han^*, B. W. Wessels, M. P. Ulmer

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

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.

Original language	English (US)
Article number	084312
Journal	Journal of Applied Physics
Volume	99
Issue number	8
DOIs	https://doi.org/10.1063/1.2189019
State	Published - 2006

Funding

The authors would like to thank Dr. Shekhawat at the Nanoscale Integrated Fabrication, Testing and Instrumentation Center for technical help with the NSOM measurements. This work is supported by NASA Grant No. NAG5-1147.

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.2189019

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

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.",

author = "B. Han and Wessels, {B. W.} and Ulmer, {M. P.}",

note = "Funding Information: The authors would like to thank Dr. Shekhawat at the Nanoscale Integrated Fabrication, Testing and Instrumentation Center for technical help with the NSOM measurements. This work is supported by NASA Grant No. NAG5-1147. ",

year = "2006",

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journal = "Journal of Applied Physics",

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AU - Han, B.

AU - Wessels, B. W.

AU - Ulmer, M. P.

N1 - Funding Information: The authors would like to thank Dr. Shekhawat at the Nanoscale Integrated Fabrication, Testing and Instrumentation Center for technical help with the NSOM measurements. This work is supported by NASA Grant No. NAG5-1147.

PY - 2006

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N2 - 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.

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

Abstract

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