摘要Long-range surface plasmon polariton (LRSPP) modes guided by a thin metal film surrounded by semi-infinite dielectrics with different refractive indices are studied. Our calculation results show that the cutoff thickness of the metal film does not monotonically increase with refractive index difference △n between the substrate and superstrate. Just because of this abnormal behaviour of cutoff thickness, the existence of LRSPP illustrates complicated situations in asymmetric configurations. For a certain metal film thickness, LRSPP may exist in one, two or three refractive index difference △n regions.
Abstract：Long-range surface plasmon polariton (LRSPP) modes guided by a thin metal film surrounded by semi-infinite dielectrics with different refractive indices are studied. Our calculation results show that the cutoff thickness of the metal film does not monotonically increase with refractive index difference △n between the substrate and superstrate. Just because of this abnormal behaviour of cutoff thickness, the existence of LRSPP illustrates complicated situations in asymmetric configurations. For a certain metal film thickness, LRSPP may exist in one, two or three refractive index difference △n regions.
[1]Raether H 1988 Surface Plasmons (Berlin: Springer) [2] Zayats A V, Smolyaninov I I and Maradudin A A 2005 Phys. Rep. 408 131 [3] Sarid D 1981 Phys. Rev. Lett. 47 1927 [4] Burke J J, Stegeman G I and Tamir T 1986 Phys. Rev.B 33 5186 [5] Yang F, Sambles J R and Bradberry G W 1991 Phys.Rev. B 44 5855 [6] Stegeman G I, Wallis R F and Maradudin A A 1983 Opt.Lett. 8 386 [7] Nikolajsen T, Leosson K, Salakhutdinov I and Bozhevolnyi SI 2003 Appl. Phys. Lett. 82 668 [8] Nikolajsen T, Leosson K and Bozhevolnyi S I 2004 Appl. Phys. Lett. 85 5833 [9] Rao Y, Liu F, Huang Y D, Dai O, Zhang W and Peng J D 2007 Chin. Phys. Lett. 24 1626 [10] Tanaka K, Tanaka M and Sugiyama T 2005 Opt. Exp. 13 256 [11] Nikolajsen Y, Leosson K and Bozhevolnyi S I 2005 Opt. Commun. 244 455 [12] Park S and Song S H 2006 Electron. Lett. 42402 [13] Nenninger G G, Tobiska P, Homola J and Yee S S 2001 Sensors Actuators B 74 145 [14] Dostalek J, Ctyroky J, Homola J, Brynda E, Skalsky M,Nekvindova P, Spirkova J, Skvor J and Schrofel J 2001 SensorsActuators B 76 8 [15] Jiang Y, Cao Z Q and Dou X M 2001 Chin. Phys. Lett. 18 1288 [16] Berini P 2001 Phys. Rev. B 63 125417 [17] Zervas M N 1991 Opt. Lett. 16 720 [18] Palik E D 1985 Handbook of Optical Constants ofSolids (Orlando, FL: Academic) p 286
2007, Vol. 24 
