Mr. Bharath Bangalore Rajeeva Profile

Bharath Bangalore Rajeeva

at Univ of Texas at Austin

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Proceedings Article | 28 August 2015 Presentation + Paper

Moiré nanosphere lithography: use colloidal moiré patterns as masks

Kai Chen, Bharath Rajeeva, Zilong Wu, Michael Rukavina, Thang Duy Dao, Satoshi Ishii, Masakazu Aono, Tadaaki Nagao, Yuebing Zheng

Proceedings Volume 9547, 95471L (2015) https://doi.org/10.1117/12.2187398

KEYWORDS: Crystals, Optical spheres, Nanostructures, Lithography, Photomasks, Nanolithography, Plasmonics, Gold, Molecular self-assembly, Nanoparticles

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Nanosphere lithography (NSL) uses self-assembled layers of monodisperse micro-/nano-spheres as masks to fabricate plasmonic metal nanoparticles. Different variants of NSL have been proposed with the combination with dry etching and/or angled-deposition. These techniques have employed to fabricate a wide variety of plasmonic nanoparticles or nanostructures. Here we report another promising extension - moiré nanosphere lithography (MNSL), which incorporates in-plane twisting between neighboring monolayers, to extend the patterning capability of conventional NSL. In conventional NSL, the masks, either a monolayer or bilayer, are formed by spontaneous self-assembly. Therefore, the resulted colloidal crystal configurations are limited. In this work we used sequential stacking of polystyrene nanosphere monolayers to form a bilayer crystal at the air/water interfaces. During this layer-by-layer stacking process, a crystal domain in the top layer gains the freedom to positon itself in a relative angle to that in the bottom layer allowing for the formation of moiré patterns. Subsequent O₂ plasma etching results in a variety of complex nanostructures that have not been reported before. Using etched moiré patterns as masks, we further fabricated the corresponding gold nanostructures and characterized their scattering optical properties. We believe this facile technique provides a new strategy to fabricate novel and complex plasmonic nanostructures or metasurfaces.

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