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Issue 11, 2018
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Ultra-fast dynamics in the nonlinear optical response of silver nanoprism ordered arrays

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Abstract

In this work we present the study of the ultra-fast dynamics of the nonlinear optical response of a honeycomb array of silver triangular nanoprisms, performed using a femtosecond pulsed laser tuned with the dipolar surface plasmon resonance of the nanoarray. Nonlinear absorption and refraction, and their time-dependence, were explored using the z-scan and time-resolved excite–probe techniques. Nonlinear absorption is shown to change sign with the input irradiance and the behavior was explained on the basis of a three-level model. The response time was determined to be in the picosecond regime. A technique based on a variable frequency chopper was also used in order to discriminate the thermal and electronic contributions to the nonlinearity, which were found to have opposite signs. All these findings propel the investigated nanoprism arrays as good candidates for applications in advanced ultra-fast nonlinear nanophotonic devices.

Graphical abstract: Ultra-fast dynamics in the nonlinear optical response of silver nanoprism ordered arrays

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Publication details

The article was received on 30 Nov 2017, accepted on 05 Feb 2018 and first published on 06 Feb 2018


Article type: Paper
DOI: 10.1039/C7NR08948A
Citation: Nanoscale, 2018,10, 5182-5190
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    Ultra-fast dynamics in the nonlinear optical response of silver nanoprism ordered arrays

    H. Sánchez-Esquivel, K. Y. Raygoza-Sanchez, R. Rangel-Rojo, B. Kalinic, N. Michieli, T. Cesca and G. Mattei, Nanoscale, 2018, 10, 5182
    DOI: 10.1039/C7NR08948A

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