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Dielectric waveguide with deep subwavelength mode confinement based on coupled semiconductor nanowires is proposed.Through the coupling between two adjacent nanowires with high refractive indexes, light can be efficiently confined in the nano-gap between the nanowires with a low refractive index. Numerical simulations indicate that the effective mode area of such a waveguide can be as small as Λ20/200, which is one order of magnitude smaller than that of a single nanowire, and such a mode confinement is comparable to that of hybrid plasmonic waveguide. It is also shown that from the view of real applications, possible existing low refractive index oxidization layers of nanowires, low refractive index substrate and small deviation of nanowire dimensions do not have significant influence on the property of the waveguide. As the propagation length is theoretically infinite for dielectric waveguides, such a coupled nanowire waveguide with deep subwavelength mode confinement may have important applications in future integrated photonic circuits.
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[15] Maier S A, Kik P G, Atwater H A, Meltzer S, Harel E, Koel B E, Requicha A A G 2003 Nature Materials 2 229
[16] Oulton R F, Sorger V J, Genov D A, Pile D F P, Zhang X 2008 Nature Photonics 2 496
[17] Oulton R F, Bartal G, Pile D F P, Zhang X 2008 New Journal of Physics 10 105018
[18] Morales A M, Lieber C M 1998 Science 279 208
[19] Rao C N R, Deepak F L, Gundiah G, Govindaraj A 2003 Progress in Solid State Chemistry 31 5
[20] Yan R X, Gargas D, Yang P D 2009 Nature Photonics 3 569
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[1] Hu X Y, Jiang P, Ding C Y, Yang H, Gong Q H 2008 Nature Photonics 2 185
[2] Zia R, Schuller J A, Chandran A, Brongersma M L 2006 Materials Today 9 20
[3] Barnes W L, Dereux A, Ebbesen T W 2003 Nature 424 824
[4] Ozbay E 2006 Science 311 189
[5] Chen J J, Li Z, Gong Q H 2009 Chin. Phys. B 18 3535
[6] Gramotnev D K, Bozhevolnyi S I 2010 Nature Photonics 4 83
[7] Schuller J A, Barnard E S, Cai W S, Jun Y C, White J S, Brongersma M L 2010 Nature Material 9 193
[8] Bozhevolnyi S I, Volkov V S, Devaux E, Laluet J Y, Ebbesen T W, 2006 Nature 440 508
[9] Steinberger B, Hohenau A, Ditlbacher H, Stepanov A L, Drezet A, Aussenegg F R, Leitner A, Krenn J R 2006 Appl. Phys. Lett. 88 094104
[10] Grandidier J, Francs G C, Massenot S, Bouhelier A, Markey L, Weeber J C, Finot C, Dereux A 2009 Nano Letters 9 2935
[11] Chen J J, Li Z, Zhang J S, Gong Q H 2008 Acta Phys. Sin. 57 5839 (in Chinese) [陈建军、 李 智、 张家森、 龚旗煌 2008 物理学报 57 5839]
[12] Yue S, Li Z, Chen J J, Gong Q H 2010 Chin. Phys. Lett. 27 027303
[13] Berini P 2000 Phys. Rev. B 61 10484
[14] Berini P, Charbonneau R, Lahoud N 2007 Nano Letters 7 1376
[15] Maier S A, Kik P G, Atwater H A, Meltzer S, Harel E, Koel B E, Requicha A A G 2003 Nature Materials 2 229
[16] Oulton R F, Sorger V J, Genov D A, Pile D F P, Zhang X 2008 Nature Photonics 2 496
[17] Oulton R F, Bartal G, Pile D F P, Zhang X 2008 New Journal of Physics 10 105018
[18] Morales A M, Lieber C M 1998 Science 279 208
[19] Rao C N R, Deepak F L, Gundiah G, Govindaraj A 2003 Progress in Solid State Chemistry 31 5
[20] Yan R X, Gargas D, Yang P D 2009 Nature Photonics 3 569
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