Improvement of Focusing Characteristics of a Spiral Plasmonic Lens

被引：7
|
作者：
Okuda, Shinpei [1 ]
Kimura, Naoyuki [1 ]
Takeda, Minoru [2 ]
Inoue, Tsutomu [3 ]
Aizawa, Kento [3 ]
机构：
[1] Kyoto Inst Technol, Dept Elect, Kyoto 6068585, Japan
[2] Kyoto Inst Technol, Dept Math & Phys Sci, Kyoto 6068585, Japan
[3] JASCO Corp, Spect Engn Div, Hachioji, Tokyo 1928537, Japan
来源：
OPTICAL REVIEW | 2014年 / 21卷 / 05期
关键词：
surface plasmon; plasmonic lens; far-field focusing; FDTD simulation; SURFACE-PLASMONS; SUPERLENS;
D O I：
10.1007/s10043-014-0088-8
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We designed and fabricated a spiral plasmonic lens (PL) with multi-circular grooves to increase light intensity in a far-field region via the constructive interference of the light scattered by the multi-circular grooves. To compare the beam focusing characteristics of a spiral PL with multi-circular grooves with those of a conventional spiral PL, we simulated the electric field distribution of the PLs operating at a 405 nm wavelength. We confirmed that the light intensity increased about twofold at 0.75 mu m above the PL surface owing to the effect of the multi-circular grooves. Furthermore, the circular grooves negligibly affect the full width at half-maximum of the focal spot, keeping the subwavelength size (similar to 200 nm) of incident light. (C) 2014 The Japan Society of Applied Physics
引用
收藏
页码：560 / 562
页数：3
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