Surface Plasmon Coupling and Control Using Spherical Cap Structures
| Autor: | Wayne P. Hess, Yu Gong, Xin Zhang, Patrick Z. El-Khoury, Alan G. Joly |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Coupling
Materials science business.industry Surface plasmon Finite-difference time-domain method Physics::Optics Spherical cap 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Rotation 01 natural sciences 0104 chemical sciences Photoemission electron microscopy Optics General Materials Science Physical and Theoretical Chemistry 0210 nano-technology business Plasmon Localized surface plasmon |
| Zdroj: | The Journal of Physical Chemistry Letters. 8:2695-2699 |
| ISSN: | 1948-7185 |
| Popis: | Propagating surface plasmons (PSPs) launched from a protruded silver spherical cap structure are investigated using photoemission electron microscopy (PEEM) and finite difference time domain (FDTD) calculations. Our combined experimental and theoretical findings reveal that PSP coupling efficiency is comparable to conventional etched-in plasmonic coupling structures. Additionally, plasmon propagation direction can be varied by linear rotation of the driving laser polarization. A simple geometric model is proposed in which the plasmon direction selectivity is proportional to the projection of the linear laser polarization on the surface normal. A application for the spherical cap coupler as a gate device is proposed. Overall, our results indicate that protruded cap structures hold great promise as elements in emerging surface plasmon applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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