title: Nanofocusing of light using three-dimensional plasmonic mode conversion.
abstract: Efficient nanofocusing of light into a gap plasmon waveguide using three-dimensional mode conversion in a strip plasmonic directional coupler is proposed. Unlike conventional nanofocusing using tapering structures, a plasmonic directional coupler converts E(z)-type odd mode energy into E(y)-type gap plasmon mode by controlling phase mismatch and gap spacing. The simulation result shows the maximum electric field intensity increases up to 58.1 times the input intensity, and 17.3% of the light is focused on the nano gap region.
authors: Shinmo
authors: S
authors: An
authors: Hyun-Shik
authors: HS
authors: Lee
authors: Yong-Beom
authors: YB
authors: Jeong
authors: Young Chul
authors: YC
authors: Jun
authors: Seung Gol
authors: SG
authors: Lee
authors: Se-Guen
authors: SG
authors: Park
authors: El-Hang
authors: el-H
authors: Lee
authors: O
authors: O
authors: Beom-Hoan