2D interface photonic crystals for surface plasmon polaritons
Sergey I. Bozhevolnyi
Institute of Physics
Aalborg University
Pontoppidanstræde 103, 9220 Aalborg Øst
Denmark
ABSTRACT:
The interest to photonic crystals (PCs) has dramatically risen since the possibility of efficient waveguiding around a sharp corner of line defect in a PC has been pointed out. This property of PC-waveguides opens the perspective of designing photonic circuits with an unprecedented level of integration. The idea is to confine the radiation in one dimension (e.g., by using a planar waveguide) and to control its propagation by 2D periodic modulation of refractive index. However, such a configuration is only quasi-2D, and there exists a formidable problem of keeping the radiation in the waveguide plane, especially that propagating along PC-waveguides. Recently, we have suggested the usage of special interface waves, viz., surface plasmon polaritons (SPPs), for the same purpose [1]. SPP's are surface electromagnetic waves propagating along a metal-dielectric interface and having the amplitudes exponentially decaying in the neighbor media. One can achieve periodic modulation of the SPP propagation constant by varying the refractive index of dielectric and/or metal or by changing the interface profile. Here the results of experimental investigations concerning SPP waveguiding along line defects in periodically corrugated surfaces of gold films [2,3] are presented and illustrated with theoretical simulations.
REFERENCES:
-
S.I. Bozhevolnyi, J. Erland, K. Leosson, P.M.W. Skovgaard, and J.M. Hvam,
Phys. Rev. Lett. 86, 3008 (2001).
-
S.I. Bozhevolnyi, V.S. Volkov, K. Leosson, and J. Erland,
Opt. Lett. 26, 734 (2001).
-
S.I. Bozhevolnyi, V.S. Volkov, K. Leosson, and A. Boltasseva,
Appl. Phys. Lett. 79, 1076 (2001).