Nonlinear refractive index of electric field aligned gold nanorods suspended in index matching oil measured with a Hartmann-Shack wavefront aberrometer
| Autor: | Anderson S. L. Gomes, G.K.B. Costa, Melissa Maldonado, Leonardo de S. Menezes, Jake Fontana, Cid B. de Araújo, Isabel C. S. Carvalho, Leonardo F. Araujo |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Atomic and Molecular Physics and Optics Collimated light law.invention 010309 optics Nonlinear system Optics law Electric field 0103 physical sciences Femtosecond Nanorod 0210 nano-technology business Refractive index Plasmon |
| Zdroj: | Optics Express. 26:20298 |
| ISSN: | 1094-4087 |
| DOI: | 10.1364/oe.26.020298 |
| Popis: | The capability to dynamically control the nonlinear refractive index of plasmonic suspensions may enable innovative nonlinear sensing and signaling nanotechnologies. Here, we experimentally determine the effective nonlinear refractive index for gold nanorods suspended in an index matching oil aligned using electric fields, demonstrating an approach to modulate the nonlinear optical properties of the suspension. The nonlinear optical experiments were carried out using a Hartmann-Shack wavefront aberrometer in a collimated beam configuration with a high repetition rate femtosecond laser. The suspensions were probed at 800 nm, overlapping with the long-axis absorption peak of the nanorods. We find that the effective nonlinear refractive index of the gold nanorods suspension depends linearly on the orientational order parameter, S, which can be understood by a thermally induced nonlinear response. We also show the magnitude of the nonlinear response can be varied by ∼ 60%. |
| Databáze: | OpenAIRE |
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