Nonlinear optical properties of semiconducting nanocrystals in fused silica

Dowd, A; Samoc, M; Luther-Davies, B; Elliman, RG

Nonlinear optical properties of semiconducting nanocrystals in fused silica

Dowd, A

Samoc, M Luther-Davies, B Elliman, RG

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Publication Type:: Journal Article
Citation:: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 1999, 148 (1-4), pp. 964 - 968
Issue Date:: 1999-01-01

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Field	Value	Language
dc.contributor.author	Dowd, A https://orcid.org/0000-0002-0500-3599	en_US
dc.contributor.author	Samoc, M	en_US
dc.contributor.author	Luther-Davies, B	en_US
dc.contributor.author	Elliman, RG	en_US
dc.date.issued	1999-01-01	en_US
dc.identifier.citation	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 1999, 148 (1-4), pp. 964 - 968	en_US
dc.identifier.issn	0168-583X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/14566
dc.description.abstract	Degenerate four-wave mixing (DFWM) is used to examine the nonlinear optical response of Ge nanocrystals in a silica matrix. The nanocrystals are formed by implanting 1.0 MeV Ge ions into silica to a dose of 3.0×1017 Ge cm-2 and annealing at 1100°C. The particle size is well described by a log normal distribution with a mean particle diameter of 3.0 nm and a dimensionless geometric standard deviation of 0.25. The nonlinear optical response, measured at 800 nm with pulse lengths in the range 100-1000 fs, is found to exhibit two patterns of behaviour. For short (180 fs) pulses the DFWM signal is shown to exhibit a third-order dependence on pulse energy (Kerr nonlinearity) and to have a relaxation time of ∼≤ 1 ps, independent of energy. However, for long pulse lengths (600 fs) the signal exhibits a higher order (∼4th order) dependence on pulse energy and has a relaxation time (∼10 ps) which increases with increasing pulse energy. Extreme pulse energies are shown to cause irreversible changes in the sample. © 1999 Elsevier Science B.V. All rights reserved.	en_US
dc.relation.ispartof	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms	en_US
dc.relation.isbasedon	10.1016/S0168-583X(98)00886-6	en_US
dc.subject.classification	Applied Physics	en_US
dc.title	Nonlinear optical properties of semiconducting nanocrystals in fused silica	en_US
dc.type	Journal Article
utslib.citation.volume	1-4	en_US
utslib.citation.volume	148	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics	en_US
utslib.for	0402 Geochemistry	en_US
utslib.for	0915 Interdisciplinary Engineering	en_US
dc.location.activity	ISI:000078575700180	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access
pubs.issue	1-4	en_US
pubs.publication-status	Published	en_US
pubs.volume	148	en_US

Abstract:

Degenerate four-wave mixing (DFWM) is used to examine the nonlinear optical response of Ge nanocrystals in a silica matrix. The nanocrystals are formed by implanting 1.0 MeV Ge ions into silica to a dose of 3.0×1017 Ge cm-2 and annealing at 1100°C. The particle size is well described by a log normal distribution with a mean particle diameter of 3.0 nm and a dimensionless geometric standard deviation of 0.25. The nonlinear optical response, measured at 800 nm with pulse lengths in the range 100-1000 fs, is found to exhibit two patterns of behaviour. For short (180 fs) pulses the DFWM signal is shown to exhibit a third-order dependence on pulse energy (Kerr nonlinearity) and to have a relaxation time of ∼≤ 1 ps, independent of energy. However, for long pulse lengths (600 fs) the signal exhibits a higher order (∼4th order) dependence on pulse energy and has a relaxation time (∼10 ps) which increases with increasing pulse energy. Extreme pulse energies are shown to cause irreversible changes in the sample. © 1999 Elsevier Science B.V. All rights reserved.

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