Light control through a nonlinear lensing effect in a colloid of biosynthesized gold nanoparticles

A. Balbuena Ortega, E. C. Brambila, V. López Gayou, R. Delgado Macuil, A. Orduña Diaz, A. Zamilpa Alvarez, A. V. Arzola, K. Volke-Sepúlveda

Research output: Contribution to journalArticleResearchpeer-review

Abstract

© 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group. Biosynthesis of four samples of colloidal suspensions of gold nanoparticles is achieved using hydroalcoholic extract and three different separated compounds of the plant Bacopa procumbens. The nonlinear optical properties of each sample are characterized with the Z-scan technique. In all cases, the Z-scan curves indicate a negative or self-defocusing response, which is mainly attributed to thermal effects. Among the four samples, the hydroalcoholic extract was noted to have the highest nonlinear optical response and was selected to demonstrate the formation of self-collimated beams (SCBs). This kind of beams are obtained when a convergent CW laser, with only few tens of milliwatts of optical power, is introduced into the sample and induces a negative-lens effect that shifts the focal spot forward. As a result, the otherwise highly focused beam propagate with little divergence over lengths of up to 10 mm. Moreover, an SCB is capable of controlling and steering a weak probe beam of a different wavelength, since the probe experiences the lensing induced by the pump. Noteworthy, the response time of the material was found to be less than 0.07 s, which makes it a plausible candidate for photonic applications.
Original languageAmerican English
Pages (from-to)502-511
Number of pages450
JournalJournal of Modern Optics
DOIs
StatePublished - 12 Mar 2019

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colloids
gold
nanoparticles
biosynthesis
probes
defocusing
temperature effects
divergence
lenses
photonics
pumps
optical properties
shift
curves
wavelengths
lasers

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Balbuena Ortega, A. ; Brambila, E. C. ; López Gayou, V. ; Delgado Macuil, R. ; Orduña Diaz, A. ; Zamilpa Alvarez, A. ; Arzola, A. V. ; Volke-Sepúlveda, K. / Light control through a nonlinear lensing effect in a colloid of biosynthesized gold nanoparticles. In: Journal of Modern Optics. 2019 ; pp. 502-511.
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Light control through a nonlinear lensing effect in a colloid of biosynthesized gold nanoparticles. / Balbuena Ortega, A.; Brambila, E. C.; López Gayou, V.; Delgado Macuil, R.; Orduña Diaz, A.; Zamilpa Alvarez, A.; Arzola, A. V.; Volke-Sepúlveda, K.

In: Journal of Modern Optics, 12.03.2019, p. 502-511.

Research output: Contribution to journalArticleResearchpeer-review

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