Metallic nanocups provide a unique method for redirecting scattered light by creating magnetic plasmon responses at optical frequencies. Despite considerable development of nanocup fabrication processes, simultaneously achieving accurate control over the placement, orientation, and geometry of nanocups has remained a significant challenge. Here we present a technique for fabricating large, periodically ordered arrays of uniformly oriented three-dimensional gold nanocups for manipulating light at subwavelength scales. Nanoimprint lithography, soft lithography, and shadow evaporation were used to fabricate nanocups onto the tips of polydimethylsiloxane nanopillars with precise control over the shapes and optical properties of asymmetric nanocups.
Bibliographical noteFunding Information:
This work was supported by Sandia National Laboratories, California. The authors thank Charles Steinhaus, Dave Heredia, François Leonard, Ryan Sochol, Adrienne Higa, and Heather Chiamori for valuable input and proofreading of the manuscript.