摘要We use two parallel nano-slits in a silver film to form a surface plasmon Mach-Zehnder interferometer (MZI), based on the interference of two surface plasmon waves propagating along the two surfaces of the silver film. Coating the silver film with a photoinduced birefringence polymer film, we achieve optical modulation of the MZI output by changing the refractive index of the polymer film with a pump beam. An on/off ratio of 2.7 is obtained for a probe wavelength of 865nm.
Abstract:We use two parallel nano-slits in a silver film to form a surface plasmon Mach-Zehnder interferometer (MZI), based on the interference of two surface plasmon waves propagating along the two surfaces of the silver film. Coating the silver film with a photoinduced birefringence polymer film, we achieve optical modulation of the MZI output by changing the refractive index of the polymer film with a pump beam. An on/off ratio of 2.7 is obtained for a probe wavelength of 865nm.
[1] Barnes W L, Dereux A and Ebbesen T W 2003 Nature 424 824 [2] Ozbay E 2006 Science 311 189 [3] Maier S A and Atwater H A 2005 J. Appl. Phys. 98 011101 [4] Passian A, Lereu A L, Arakawa E T, Ritchie R H, Thundat Tand Ferrell T L 2004 Appl. Phys. Lett. 85 2703 [5] Nikolajsen T, Leosson K and Bozhevolnyi S I 2004 Appl. Phys. Lett. 85 5833 [6] Pacifici D, Lezec H J and Atwater H A 2007 NaturePhotonics 1 402 [7] Dickson W, Wurtz G A, Evans P R, Pollard R J and Zayats AV 2008 Nano Lett. 8 281 [8] Schouten H F, Kuzmin N, Dubois G, Visser T D, Gbur G,Alkemade P F A, Blok H, Hooft G W't, Lenstra D and Eliel E R 2005 Phys. Rev. Lett. 94 053901 [9] Li Z, Zhang J S, Yan H F and Gong Q H 2007 Chin.Phys. Lett. 24 3233 [10] Raether H 1988 Surface Plasmons on Smooth and RoughSurfaces and on Gratings (Berlin: Springer) [11] Johnson P B and Christy RW 1972 Phys. Rev. B 6 4370 [12] Oliveira Jr. O N, dos Santos Jr. D S, Balogh D T,Zucolotto V and Mendon\c{ca C R 2005 Adv. Colloid Interf.Sci. 116 179 [13] Rochon P, Gosselin J, Natansohn A and Xie S 1992 Appl. Phys. Lett. 60 4 [14] Yang Q, Wei Z, Zhang Y, Sun G and Li F 2001 Appl.Phys. B 72 855 [15] Hu X Y, Jiang P, Ding C Y and Gong Q H 2007 Appl.Phys. B 87 255 [16] Dalton L 2002 Adv. Polym. Sci. 158 1