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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 6 — Mar. 24, 2014
  • pp: 6222–6228

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

Matthew P. Shortell, Esa A. Jaatinen, Jin Chang, and Eric R. Waclawik  »View Author Affiliations

Optics Express, Vol. 22, Issue 6, pp. 6222-6228 (2014)

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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.

© 2014 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(320.4240) Ultrafast optics : Nanosecond phenomena
(160.4236) Materials : Nanomaterials

ToC Category:
Nonlinear Optics

Original Manuscript: January 13, 2014
Revised Manuscript: February 21, 2014
Manuscript Accepted: February 24, 2014
Published: March 10, 2014

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

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