Skip to main content
eScholarship
Open Access Publications from the University of California

Adiabatic and nonadiabatic nanofocusing of plasmons by tapered gap plasmon waveguides

  • Author(s): Pile, DFP
  • Gramotnev, D K
  • et al.
Abstract

Adiabatic and nonadiabatic nanofocusing of plasmons in tapered gap plasmon waveguides is analyzed using the finite-difference time-domain algorithm. Optimal adaptors between two different subwavelength waveguides and conditions for maximal local field enhancement are determined, investigated, and explained on the basis of dissipative and reflective losses in the taper. Nanofocusing of plasmons into a gap of similar to 1 nm width with more than 20 times increase in the plasmon energy density is demonstrated in a silver-vacuum taper of similar to 1 mu m long. Comparison with the approximate theory based on the geometrical optics approximation is conducted.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View