title: Multiple-wavelength focusing of surface plasmons with a nonperiodic nanoslit coupler.
abstract: A novel type of multiple-wavelength focusing plasmonic coupler based on a nonperiodic nanoslit array is designed and experimentally demonstrated. An array of nanoslits patterned on a thin metal film is used to couple free-space light into surface plasmon polaritons (SPPs) and simultaneously focus different-wavelength SPPs into arbitrary predefined locations in the two-dimensional plane. We design and fabricate a compact triplexer on a glass substrate with an integrated silicon photodetector. The photocurrent spectra demonstrate that the incident light is effectively coupled to SPPs and routed into three different focal spots depending on the wavelength. The proposed scheme provides a simple method of building wavelength-division multiplexing and spectral filtering elements, integrated with other plasmonic and optoelectronic devices.
authors.affiliation: Edward L. Ginzton Laboratory, Stanford University, Stanford California 94305-4088, United States. tanemura@ee.t.u-tokyo.ac.jp
authors.forename: Takuo
authors.initials: T
authors.lastname: Tanemura
authors.forename: Krishna C
authors.initials: KC
authors.lastname: Balram
authors.forename: Dany-Sebastien
authors.initials: DS
authors.lastname: Ly-Gagnon
authors.forename: Pierre
authors.initials: P
authors.lastname: Wahl
authors.forename: Justin S
authors.initials: JS
authors.lastname: White
authors.forename: Mark L
authors.initials: ML
authors.lastname: Brongersma
authors.forename: David A B
authors.initials: DA
authors.lastname: Miller
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D006046:Gold / Q000737:chemistry; D008027:Light; D008567:Membranes, Artificial; D036103:Nanotechnology / Q000295:instrumentation*; D010316:Particle Size; D012825:Silicon / Q000737:chemistry; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D013499:Surface Properties
chemical_list: D008567:Membranes, Artificial; D006046:Gold; D012825:Silicon