Wei, Liu; Neshev, Dragomir; Miroshnichenko, Andrey; Shadrivov, Ilya; Kivshar, Yuri
We introduce the concept of polychromatic plasmonics and suggest a broadband plasmonic lens for nanofocusing of surface plasmon polaritons. The lens employs a parabolically modulated metal-dielectric-metal structure. This plasmonic lens has a bandwidth of more than an optical octave, thus opening new opportunities for broadband plasmonic applications.
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