title: Frequency tunable near-infrared metamaterials based on VO2 phase transition.
abstract: Engineering metamaterials with tunable resonances from mid-infrared to near-infrared wavelengths could have far-reaching consequences for chip based optical devices, active filters, modulators, and sensors. Utilizing the metal-insulator phase transition in vanadium oxide (VO(2)), we demonstrate frequency-tunable metamaterials in the near-IR range, from 1.5 - 5 microns. Arrays of Ag split ring resonators (SRRs) are patterned with e-beam lithography onto planar VO(2) and etched via reactive ion etching to yield Ag/VO(2) hybrid SRRs. FTIR reflection data and FDTD simulation results show the resonant peak position red shifts upon heating above the phase transition temperature. We also show that, by including coupling elements in the design of these hybrid Ag/VO(2) bi-layer structures, we can achieve resonant peak position tuning of up to 110 nm.
authors.affiliation: California Institute of Technology, 1200 E. California Boulevard, Pasadena, California, USA. haa@caltech.edu
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Dicken
authors.forename: Koray
authors.initials: K
authors.lastname: Aydin
authors.forename: Imogen M
authors.initials: IM
authors.lastname: Pryce
authors.forename: Luke A
authors.initials: LA
authors.lastname: Sweatlock
authors.forename: Elizabeth M
authors.initials: EM
authors.lastname: Boyd
authors.forename: Sameer
authors.initials: S
authors.lastname: Walavalkar
authors.forename: James
authors.initials: J
authors.lastname: Ma
authors.forename: Harry A
authors.initials: HA
authors.lastname: Atwater
mesh_terms: D008027:Light; D008420:Manufactured Materials / Q000032:analysis*; D008567:Membranes, Artificial; D010087:Oxides / Q000737:chemistry*; D044367:Phase Transition; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D014639:Vanadium / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D010087:Oxides; D014639:Vanadium