Using pulse transit delay in Z-scan to discriminate between excited-state absorption and other nonlinear processes in ZnO nanocones

Shortell, Matthew P., Jaatinen, Esa A., Chang, Jin, & Waclawik, Eric R. (2014) Using pulse transit delay in Z-scan to discriminate between excited-state absorption and other nonlinear processes in ZnO nanocones. Optics Express, 22(6), pp. 6222-6228.

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Abstract

We report a new approach that uses the single beam Z-scan technique, to discriminate between excited state absorption (ESA) and two and three photon nonlinear absorption. By measuring the apparent delay or advance of the pulse in reaching the detector, the nonlinear absorption can be unambiguously identified as either instantaneous or transient. The simple method does not require a large range of input fluences or sophisticated pulse-probe experimental apparatus. The technique is easily extended to any absorption process dependent on pulse width and to nonlinear refraction measurements. We demonstrate in particular, that the large nonlinear absorption in ZnO nanocones when exposed to nanosecond 532 nm pulses, is due mostly to ESA, not pure two-photon absorption.

Impact and interest:

2 citations in Scopus
2 citations in Web of Science®
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ID Code: 69516
Item Type: Journal Article
Refereed: Yes
Additional Information: Funding was provided by the Asian Office of Aerospace Research and Development (AOARD). Grant ID: AOARD-13-4016
Keywords: ZnO, Z-scan, multiphoton absorption, excited state absorption
DOI: 10.1364/OE.22.006222
ISSN: 1094-4087
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500) > Nonlinear Optics and Spectroscopy (020503)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Optical Society of America
Deposited On: 28 Mar 2014 00:33
Last Modified: 01 Apr 2014 04:40

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