Spectral properties of plasmonic resonator antennas.
A theoretical study of the optical properties of metallic nano-strip antennas is presented. Such strips exhibit retardation-based resonances resulting from the constructive interference of counter propagating short-range surface plasmon-polaritons (SR-SPPs) that reflect from the antenna terminations. A Fabry-P erot model was formulated that successfully predicts both the peak position and spectral shape of their optical resonances. This model requires knowledge of the SR-SPP reflection amplitude and phase pickup upon reflection from the structure terminations. These quantities were first estimated using an intuitive Fresnel reflection model and then calculated exactly using full-field simulations based on the finite-difference frequency-domain (FDFD) method. With only three dimensionless scaling parameters, the Fabry-P erot model provides simple design rules for engineering resonant properties of such plasmonic resonator antennas.
Barnard
Edward S
ES
Geballe Laboratory for Advanced Materials, Stanford University 476 Lomita Mall, Stanford, CA 94305, USA.
White
Justin S
JS
Chandran
Anu
A
Brongersma
Mark L
ML
D003198:Computer Simulation; D008027:Light; D008670:Metals / Q000737:chemistry*; D008962:Models, Theoretical; D049329:Nanostructures / Q000737:chemistry*; D012542:Scattering, Radiation; D013057:Spectrum Analysis / Q000379:methods*; D020349:Surface Plasmon Resonance / Q000379:methods*
D008670:Metals