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In this paper,we investigate the gap plasmon excitation by swift electron beams in nanowire pairs, in particular, with different cross-section shapes (including circular, wedge and irregular shape). For all these nanowire pairs, our results show that fast electron beams can efficiently excite low-order monopole-monopole gap plasmons, which possess long propagation distance and well spatial localization. Furthermore, in contrast to high-order plasmons, the excited gap plasmons do not depend highly on cross-section shape of nanowire pairs through comparing the merit parameters in these three kinds of waveguides. Besides, the excited gap mode will be more confined in nanowire pairs with wedge cross-section. Our study will be helpful for the experiments of gap plasmon generation using electron microscope.
[1] Hecht B, Bielefeldt H, Novotny L, Inouye Y, Pohl D W 1996 Phys. Rev. Lett. 77 1889
[2] Kneipp K, Wang Y, Kneipp H, Perelman L T, Itzkan I, Dasari R R, Feld M S 1997 Phys. Rev. Lett. 78 1667
[3] Maier S A, Kik P G, Atwater H A, Meltzer S, Harel E, Koel B E, Requicha A A G 2003 Nat. Mater. 2 229
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[5] Moreno E, Rodrigo S G, Bozhevolnyi S I, Martín-Moreno L, García-Vidal F J 2008 Phy. Rev. Lett. 100 023901
[6] Bozhevolnyi S I, Volkov V S, Devaux E, Laluet J Y, Ebbesen T W 2006 Nature 440 508
[7] Zheng X H, Wang Y Q, Zhang Y 2009 Acta Phys. Sin. 58 8571 (in Chinese) [郑显华、王瑛琪、张 岩 2009 58 8571]
[8] Fernndez-Domínguez A I, Moreno E, Martín-Moreno L, García-Vidal F J 2009 Opt. Lett. 34 2063
[9] Manjavacas A, García de Abajo F J 2008 Nano Lett. 9 1285
[10] Chen H, Wang L 2009 Acta Phys. Sin. 58 4605 (in Chinese) [陈 华、汪 力 2009 58 4605]
[11] Guo Y N, Xue W R, Zhang W M 2009 Acta Phys. Sin. 58 4168 (in Chinese) [郭亚楠、薛文瑞、张文梅 2009 58 4168]
[12] Xue W R, Guo Y N, Zhang W M 2010 Chin. Phys. B 19 017302
[13] Oulton R F, Sorger V J, Genov D A, Pile D F P, Zhang X 2008 Nat. Photon. 2 496
[14] Chen J J, Li Z, Gong Q H 2009 Chin. Phys. B 18 3535
[15] Bashevoy M V, Jonsson F, Krasavin A V, Zheludev N I, Chen Y, Stockman M I 2006 Nano Lett. 6 1113
[16] Cai W, Sainidou R, Xu J J, Polman A, García de Abajo F J 2009 Nano Lett. 3 1176
[17] Kuttge M, Cai W, García de Abajo F J, Polman A 2009 Phys. Rev. B 80 033409
[18] Gómez-Medina R, Yamamoto N, Nakano M, García de Abajo F J 2008 New J. Phys. 10 105009
[19] Vesseur E J R, de Waele R, Kuttge M, Polman A 2007 Nano Lett. 7 2843
[20] García de Abajo F J, Howie A 2002 Phys. Rev. B 65 115418
[21] García de Abajo F J, Howie A 1998 Phys. Rev. Lett. 80 5180
[22] García de Abajo F J, Kociak M 2008 Phys. Rev. Lett. 100 106804
[23] Johnson P B, Christy R W 1972 Phys. Rev. B 6 4370
[24] Cai W, Wang L, Zhang X Z, Xu J J, García de Abajo F J 2010 Phys. Rev. B 82 125454
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[1] Hecht B, Bielefeldt H, Novotny L, Inouye Y, Pohl D W 1996 Phys. Rev. Lett. 77 1889
[2] Kneipp K, Wang Y, Kneipp H, Perelman L T, Itzkan I, Dasari R R, Feld M S 1997 Phys. Rev. Lett. 78 1667
[3] Maier S A, Kik P G, Atwater H A, Meltzer S, Harel E, Koel B E, Requicha A A G 2003 Nat. Mater. 2 229
[4] Quinten M, Leitner A, Krenn J R, Aussenegg F R 1998 Opt. Lett. 23 1331
[5] Moreno E, Rodrigo S G, Bozhevolnyi S I, Martín-Moreno L, García-Vidal F J 2008 Phy. Rev. Lett. 100 023901
[6] Bozhevolnyi S I, Volkov V S, Devaux E, Laluet J Y, Ebbesen T W 2006 Nature 440 508
[7] Zheng X H, Wang Y Q, Zhang Y 2009 Acta Phys. Sin. 58 8571 (in Chinese) [郑显华、王瑛琪、张 岩 2009 58 8571]
[8] Fernndez-Domínguez A I, Moreno E, Martín-Moreno L, García-Vidal F J 2009 Opt. Lett. 34 2063
[9] Manjavacas A, García de Abajo F J 2008 Nano Lett. 9 1285
[10] Chen H, Wang L 2009 Acta Phys. Sin. 58 4605 (in Chinese) [陈 华、汪 力 2009 58 4605]
[11] Guo Y N, Xue W R, Zhang W M 2009 Acta Phys. Sin. 58 4168 (in Chinese) [郭亚楠、薛文瑞、张文梅 2009 58 4168]
[12] Xue W R, Guo Y N, Zhang W M 2010 Chin. Phys. B 19 017302
[13] Oulton R F, Sorger V J, Genov D A, Pile D F P, Zhang X 2008 Nat. Photon. 2 496
[14] Chen J J, Li Z, Gong Q H 2009 Chin. Phys. B 18 3535
[15] Bashevoy M V, Jonsson F, Krasavin A V, Zheludev N I, Chen Y, Stockman M I 2006 Nano Lett. 6 1113
[16] Cai W, Sainidou R, Xu J J, Polman A, García de Abajo F J 2009 Nano Lett. 3 1176
[17] Kuttge M, Cai W, García de Abajo F J, Polman A 2009 Phys. Rev. B 80 033409
[18] Gómez-Medina R, Yamamoto N, Nakano M, García de Abajo F J 2008 New J. Phys. 10 105009
[19] Vesseur E J R, de Waele R, Kuttge M, Polman A 2007 Nano Lett. 7 2843
[20] García de Abajo F J, Howie A 2002 Phys. Rev. B 65 115418
[21] García de Abajo F J, Howie A 1998 Phys. Rev. Lett. 80 5180
[22] García de Abajo F J, Kociak M 2008 Phys. Rev. Lett. 100 106804
[23] Johnson P B, Christy R W 1972 Phys. Rev. B 6 4370
[24] Cai W, Wang L, Zhang X Z, Xu J J, García de Abajo F J 2010 Phys. Rev. B 82 125454
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