Physics – Optics
Scientific paper
2000-10-03
Physics
Optics
4 Pages including 3 Figures
Scientific paper
The finite-difference time-domain method was employed to simulate light propagation in tapered near-field fiber probes with small metal aperture. By conducting large-volume simulations, including tapered metal-cladding waveguide and connected optical fiber waveguide, we illustrated the coupling between these guiding modes as well as the electric field distribution in the vicinity of the aperture. The high collection efficiency of a double-tapered probe was reproduced and was ascribed to the shortening of the cutoff region and the efficient coupling to the guiding mode of the optical fiber. The dependence of the efficiency on the tapered structure parameters was also examined.
Kambe Hirotomo
Nakamura Hiroaki
Saiki Toshiharu
Sato Tetsuya
Sawada Keiji
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