Active resonance tuning of stretchable plasmonic structures

摘要

Active resonance tuning is highly desired for the applications of plasmonic structures, such as optical switchesand surface enhanced Raman substrates. In this paper, we demonstrate the active tunable plasmonic structures,which composed of monolayer arrays of metallic semishells with dielectric cores on stretchable elasticsubstrates. These composite structures support Bragg-type surface plasmon resonances whose frequencies aresensitive to the arrangement of the metallic semishells. Under uniaxial stretching, the lattice symmetry of theseplasmonic structures can be reconfigured from hexagonal to monoclinic lattice, leading to not only large but alsopolarization-dependent shifts of the resonance frequency. The experimental results are supported by the numericalsimulations. Our structures fabricated using simple and inexpensive self-assembly and lift-transfer techniquescan open up applications of the stretch-tunable plasmonic structures in sensing, switching, and filtering.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.