Title :
Broadside Excitation of Long-Range Surface Plasmons via Grating Coupling
Author :
Chen, Chengkun ; Berini, Pierre
Author_Institution :
Sch. of Inf. Technol. & Eng., Univ. of Ottawa, Ottawa, ON, Canada
Abstract :
A metal grating for coupling a Gaussian beam incident from broadside to the long-range surface plasmon-polariton (LRSPP) propagating along a membrane-supported Au slab is proposed and modelled by the finite-difference time-domain method. A short grating design consisting of a small number of Au bumps yields a 19.5% coupling efficiency at ??0 = 1310 nm into the LRSPP propagating in a single direction when the grating is excited off-center near one of its edges. The grating coupler is easy to fabricate and it facilitates experimental alignments.
Keywords :
diffraction gratings; finite difference time-domain analysis; optical couplers; polaritons; surface plasmons; Gaussian beam; broadside excitation; finite difference time domain method; gold slab; grating coupler; long range surface plasmon polariton; metal grating; Coupler; grating; long-range; membrane; plasmon; polariton; surface;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2034130
