Nanofocusing of light using three-dimensional plasmonic mode conversion

作者：An Shinmo; Lee Hyun Shik; Jeong Yong Beom; Jun Young Chul; Lee Seung Gol; Park Se Guen; Lee El Hang; Beom Hoan O^*

来源：Optics Express, 2013, 21(23): 27816-27825.

DOI：10.1364/OE.21.027816

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.

• 出版日期2013-11-18