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Tunable plasmonic response from alkanethiolate-stabilized gold nanoparticle superlattices: evidence of near-field
Chi-Fan Chen1, Shien-Der Tzeng, Hung-Ying Chen
1Institute of Nanoengineering and Microsystems and Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan, Republic of China.
Abstract:
We report on the self-assembly of large-area, highly ordered 2D superlattices of alkanethiolate-stabilized gold nanoparticles ( approximately 10.5 nm in core diameter) onto quartz substrates with varying lattice constants, which can be controlled by the alkyl chain lengths, ranging from C12 (1-dodecanethiolate), C14 (1-tetradecanethiolate), C16 (1-hexadecanethiolate), to C18 (1-octadecanethiolate). These 2D nanoparticle superlattices exhibit strong collective surface plasmon resonance that is tunable via the near-field coupling of adjacent nanoparticles. The approach presented here provides a unique and viable means of building artificial "plasmonic crystals" with precisely designed optical properties, which can be useful for the emerging fields of plasmonics, such as subwavelength integrated optics.
