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A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have  equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
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Surface Plasmon Coupling and Control Using Spherical Cap Structures.

Yu Gong1, Alan G Joly1, Xin Zhang1

  • 1Physical Sciences Division, Pacific Northwest National Laboratory , P.O. Box 999, Richland, Washington 99352, United States.

The Journal of Physical Chemistry Letters
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Summary
This summary is machine-generated.

Researchers explored propagating surface plasmons (PSPs) using silver spherical caps. This novel structure shows efficient PSP coupling and controllable propagation direction, suggesting potential for advanced plasmonic devices.

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Area of Science:

  • Plasmonics and Nanophotonics
  • Surface Science
  • Optical Engineering

Background:

  • Surface plasmons are crucial for nanoscale light manipulation.
  • Conventional plasmonic structures face limitations in efficiency and tunability.
  • Novel geometries are needed to enhance plasmonic device performance.

Purpose of the Study:

  • To investigate propagating surface plasmons (PSPs) launched from protruded silver spherical caps.
  • To compare the efficiency of spherical cap structures with traditional plasmonic couplers.
  • To explore the control of plasmon propagation direction using laser polarization.

Main Methods:

  • Photoemission electron microscopy (PEEM) for experimental visualization of PSPs.
  • Finite difference time domain (FDTD) calculations for theoretical modeling.
  • Systematic variation of laser polarization to study directionality.

Main Results:

  • PSP coupling efficiency from spherical caps is comparable to etched structures.
  • Plasmon propagation direction is tunable via rotation of laser polarization.
  • A geometric model accurately predicts direction selectivity based on polarization and surface normal.

Conclusions:

  • Protruded silver spherical caps are effective PSP launchers.
  • Spherical cap structures offer controllable plasmon propagation for device applications.
  • These structures show significant promise for future nanoscale optical and electronic devices.