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

Nanoscale
Héctor Sánchez-EsquivelGiovanni Mattei

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.

References

Oct 3, 2005·Optics Express·Andrea GnoliMarcofabio Righini
Jul 15, 2017·Scientific Reports·Héctor Sánchez-EsquivelGiovanni Mattei

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Citations

Jun 20, 2019·Advanced Materials·Mengxin RenJingjun Xu
Aug 10, 2019·Scientific Reports·K Y Raygoza-SánchezR Rangel-Rojo

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Methods Mentioned

BETA
surface plasmon resonance
quartz microbalance
AFM

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