Abstract
Metallic colloids can confine and focus light below the diffraction limit, leading to interesting properties and applications, such as metamaterials and sensors. However, accurate knowledge of the refractive indices of these colloids is critical to develop their unique optical properties. Anisotropic colloids, such those with Au nanorods (NRs) can be aligned with external electric fields, thus dynamically controlling the system’s optical properties. NRs have two extinction peaks corresponding to plasmon resonances along and across the long NRs axis. By applying a variable voltage across the laser propagation direction, Padilha et al. measured the dependence of the extinction on this applied voltage and on the light polarization [1]. The sample’s nonlinear refractive index n2 was measured for applied voltages up to 10 kV and for laser polarization perpendicular and parallel to the applied electric field, obtaining a variation of ~25% of the n2 value compared to when one does not apply any voltage.
© 2017 IEEE
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