title: Critical coupling in dissipative surface-plasmon resonators with multiple ports.
abstract: 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.
authors.affiliation: Department of Physics, Hanyang University, Seoul 133-791, Republic of Korea.
authors.forename: Jaewoong
authors.initials: J
authors.lastname: Yoon
authors.forename: Kang Hee
authors.initials: KH
authors.lastname: Seol
authors.forename: Seok Ho
authors.initials: SH
authors.lastname: Song
authors.forename: Robert
authors.initials: R
authors.lastname: Magnusson
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014159:Transducers