Open AccessCritical coupling in dissipative surface-plasmon resonators with multiple ports
Author(s) -
Jae Woong Yoon,
Kang Hee Seol,
Seok Ho Song,
Robert Magnusson
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.025702
Subject(s) - resonator , optics , surface plasmon , coupling (piping) , surface plasmon resonance , dissipative system , absorbance , surface plasmon polariton , grating , diffraction , localized surface plasmon , physics , resonance (particle physics) , port (circuit theory) , absorption (acoustics) , coupled mode theory , total internal reflection , materials science , diffraction grating , plasmon , refractive index , atomic physics , electronic engineering , quantum mechanics , nanoparticle , metallurgy , engineering
We theoretically investigate resonant absorption in a multiple-port surface-plasmon polaritons (SPP) resonator near the condition of critical coupling at which internal loss is comparable to radiation coupling. We show that total absorption is obtainable in a multiple-port system by properly configuring multiple coherent lightwaves at the condition of critical coupling. We further derive analytic expressions for the partial absorbance at each port, the total absorbance, and their sum rule, which provide a non-perturbing method to probe coupling characteristics of highly localized optical modes. Rigorous simulation results modeling a surface-plasmon resonance grating in the multiple-order diffraction regime show excellent agreements with the analytic expressions.