Abstract
As an important plasmon one-dimensional material, orientation- and polarization-dependent properties of single Ag nanowires/glass substrate system are investigated by a powerful platform consisting of evanescent wave excitation, near-/far-field detection and a micromanipulator. In the case of the nanowire perpendicular or parallel to the incident plane and p- ors-polarized evanescent excitation respectively, optical properties of the nanowire is measured both in far-field and near-field. For the perpendicular situation, scattering light from the nanowire shows strong dependence on the polarization of incident light, and period patterns along the nanowire are observed both in the near- and far-field. The chain of dipole model is used to explain the origin of this pattern. The discrepancy of the period patterns observed in the near- and far-field is due to the different resolution of the near- and far-field detection. For the parallel case, light intensity from the output end also depends on the incident polarization. Both experimental and calculation results show that the polarization dependence effect results from the surface plasmon excitation. These results on the orientation- and polarization-dependent properties of the Ag nanowires detected by the combination of near- and far-field methods would be helpful to understand interactions of one-dimensional plasmonic nanostructures with light.
Highlights
An evanescent wave generated by the fiber taper or internal total reflection is an effective way for excitation without the strong background
The fiber taper configuration has the advantage of a high integrated level and miniaturized size, the internal total reflection are used in our present experimental setup for easy combination with a SNOM to image with a high resolution and with a micromanipulator to control the position and orientation of the single nanowire
As the nanowire is excited by the evanescent wave, the scattered light is collected by the objective lens with a maximum angle of 60°.The scattering and absorption of evanescent waves by small spherical particles has been studied in the framework of generalized Mie theory[40,41,42]
Summary
The fiber taper configuration has the advantage of a high integrated level and miniaturized size, the internal total reflection are used in our present experimental setup for easy combination with a SNOM to image with a high resolution and with a micromanipulator to control the position and orientation of the single nanowire Such the experimental setup combined with evanescent wave excitation, near-/far-field detection and a micromanipulator is a more appropriate choice for the investigation of the single nanowire. The work demonstrates that the experimental setup with multi-functionality of the micro manipulating for orientation controlling, the Dove prism-based evanescent wave excitation and far-/near-field detection, is an effective means to investigate properties of the single nanowire. The obtained results would be helpful to a deeper understanding of nanowire properties for applications in nanoscale optical devices
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