The ability to arrange plasmonic nanoparticles (NPs) into well-ordered assemblies is a powerful strategy to produce new near-field and far-field optical properties. Bottom-up assembly methods using molecular recognition such as DNA linkers are effective, but the yield and purity of the NP oligomers is low. Top-down tools such as electron-beam lithography can create assemblies with good control over NP shape and separation; however, throughput is limited, especially for NP assemblies made from more than one metal. This talk will describe a new approach, Reconstructable Mask Lithography, to situate plasmonic NPs within a subwavelength footprint that can also be scaled over in<sup>2</sup>-areas. We will discuss the versatility of this method to create Au-Pd NP dimers and NP trimers for hydrogen gas sensing. We carried out FDTD modeling to explain blue and red resonance wavelength shifts of the plasmonic hetero-oligomers after hydrogen adsorption.

Plasmonic hetero-oligomer nanoparticle arrays for hydrogen sensing

249th National Meeting (2015)

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