We propose a design for patterned metal-coated surfaces allowing efficient broadband coupling of radiation to a fully localized surface cavity mode, resulting in a zero-focal-length concentrator. This finite structure exploits the interplay of a defect mode cavity with a coupling grating and is investigated through the modal expansion method and finite-difference time domain calculations.
© 2006 Optical Society of America
(040.4200) Detectors : Multiple quantum well
(130.3120) Integrated optics : Integrated optics devices
(230.5160) Optical devices : Photodetectors
(240.6680) Optics at surfaces : Surface plasmons
(260.3090) Physical optics : Infrared, far
Mathieu Carras and Alfredo De Rossi, "Field concentration by exciting surface defect modes," Opt. Lett. 31, 47-49 (2006)