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(Color online) (a) Schematic of Au nanoparticle self-assembly and transfer. (b) SEM image of nanoparticle mat. Inset: optical image of nanoparticle mat in a teflon beaker. (c) Measured optical reflectivity of Au nanoparticle mat, with calculated spectra of a 20 nm continuous Au film and scattering spectrum of a single 20 nm Au sphere (scaled), both embedded in a medium of refractive index n = 1.4.
(Color online) Reflection spectra of Au nanoparticle mats under increasing strain. (a) Uniaxial stretch parallel to optical polarization and (b) biaxial uniform stretch with unpolarized light. The discrepancy in intensity if due to the curved film on the lens surface.
(Color online) (a) Resonant shifts of Au nanoparticle mats vs strain, for 1D stretch (▾, polarization parallel to stretch axis), 1D stretch (▴, polarization perpendicular to stretch axis), 2D stretch (▪, unpolarized light), 1D stretch (▿ extension and △ contraction, unpolarized light) with power-law fits (dotted lines). (b) Hexagonal array with equal interparticle separations can be aligned at different angles relative to the stretch axis. With increasing strain the distances d 1, d 2, and d 3 will change depending on their angle to the stretch axis. (c) Change in interparticle separation in a dimer depending on angle θ to the stretch axis. (d) 1D parallel polarized data fitted with simulations of resonant scattering peaks for 1D Au nanoparticle chain shown in inset. N = 19, a = 10 nm, polarization along chain axis, embedded in medium with n PDMS = 1.4.
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