Static and dynamic tuning of surface plasmon resonance by controlling interparticle distance in arrays of Au nanoparticles

Abstract Static and dynamic tuning of plasmonic resonance in arrays of Au nanoparticles fabricated using self-assembly method on stretchable substrates was investigated. Static tuning was realized by altering the self-assembly conditions, which allowed varying average separation between Au nanoparticles and tune their collective plasmon mode with a broad wavelength range. Dynamic tuning was achieved by applying uniaxial or biaxial strain to the Au nanoparticle arrays on a stretchable substrate. Plasmonic tunability and anisotropy were demonstrated by strain-controlled stretchable substrate. Spectral shifts of collective plasmon modes with strain were found to depend on incident polarization and interparticle distance. The obtained plasmonic nanostructures can be applied as mechanically tunable plasmonic optical filters and sensors.