Improvement of focusing characteristics of a spiral plasmonic lens |
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Authors: | Shinpei Okuda Naoyuki Kimura Minoru Takeda Tsutomu Inoue Kento Aizawa |
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Institution: | 1. Department of Electronics, Kyoto Institute of Technology, Kyoto, 606-8585, Japan 2. Department of Mathematical and Physical Sciences, Kyoto Institute of Technology, Kyoto, 606-8585, Japan 3. Spectroscopy Engineering Division, JASCO Corporation, Hachioji, Tokyo, 192-8537, Japan
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Abstract: | We designed and fabricated a spiral plasmonic lens (PL) with multi-circular grooves to increase light intensity in a farfield 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 μm 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 (~200 nm) of incident light. |
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