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We numerically demonstrate a kind of tapered hollow silver waveguide for optically guiding and focusing of light through finite-difference time-domain (FDTD) simulations. The results of numerical simulation reveal that the tapered hollow silver waveguide can efficiently guide and focus a laser light to a tiny, highly localized beam spot of 1 μm diameter. The physical mechanism of the cone-focused laser light is explored. The influence of incident angle and waveguide geometry on the focusing properties is also discussed. The results obtained here might have important reference value for applications in tapered optics, and designing the optimum cone shape for fast ignition and generating high energy charged particles.
[1] Kodama R, Norreys P A, Mima K, Dangor A E, Evans R G, Fujita H, Kitagawa Y, Krushelnick K, Miyakoshi T, Miyanaga N, Norimatsu T, Rose S J, Shigemori T, Sunahara A, Tampo M, Tanaka K A, Toyama Y, Yamanaka T, Zepf M 2001 Nature 412 798
[2] Narita S, Matsuura Y, Miyagi M 2007 Opt.Lett. 32 930
[3] Cao L H, Yu W, Yu M Y, Xu H, He X T, Gu Y Q, Liu Z J, Li J H, Zhang C Y 2008 Phys.Rev.E 78 036405
[4] Zeng X H, Fan D Y 2009 Opt. Express 17 34
[5] Taflove A, Hagness S C 2005 3rd ed. Computational Electrodynamics: The Finite-Difference Time-Domain Method (Boston: Artech House)
[6] Sai W M 2005 Opt. Express 13 4818
[7] Ebbesen T W, Lezec H J, Ghaemi H F, Thio T, Wolff P A 1998 Nature 391 667
[8] Raether H 1988 Surface Plasmons on Smooth and Rough Surfaces and Gratings (Berlin: Springer)
[9] Zeng X H, Fan D Y 2009 Appl. Opt. (submitted)
[10] Nakamura H, Chrisman B, Tanimoto T, Borghesi M, Kondo K, Nakatsutsumi M, Norimatsu T, Tampo M, Tanaka K A, Yabuuchi T, Sentoku Y, Kodama R 2009 Phys.Rev.Lett. 102 045009
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[1] Kodama R, Norreys P A, Mima K, Dangor A E, Evans R G, Fujita H, Kitagawa Y, Krushelnick K, Miyakoshi T, Miyanaga N, Norimatsu T, Rose S J, Shigemori T, Sunahara A, Tampo M, Tanaka K A, Toyama Y, Yamanaka T, Zepf M 2001 Nature 412 798
[2] Narita S, Matsuura Y, Miyagi M 2007 Opt.Lett. 32 930
[3] Cao L H, Yu W, Yu M Y, Xu H, He X T, Gu Y Q, Liu Z J, Li J H, Zhang C Y 2008 Phys.Rev.E 78 036405
[4] Zeng X H, Fan D Y 2009 Opt. Express 17 34
[5] Taflove A, Hagness S C 2005 3rd ed. Computational Electrodynamics: The Finite-Difference Time-Domain Method (Boston: Artech House)
[6] Sai W M 2005 Opt. Express 13 4818
[7] Ebbesen T W, Lezec H J, Ghaemi H F, Thio T, Wolff P A 1998 Nature 391 667
[8] Raether H 1988 Surface Plasmons on Smooth and Rough Surfaces and Gratings (Berlin: Springer)
[9] Zeng X H, Fan D Y 2009 Appl. Opt. (submitted)
[10] Nakamura H, Chrisman B, Tanimoto T, Borghesi M, Kondo K, Nakatsutsumi M, Norimatsu T, Tampo M, Tanaka K A, Yabuuchi T, Sentoku Y, Kodama R 2009 Phys.Rev.Lett. 102 045009
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