Metal nanostructures are critical to various academic and industrial fields interested in studying and exploiting their plasmonic characteristics. Here we discuss the preparation of gold nanocups (250 nm diameter) and their plasmonic properties. An initial gold structure is synthesized by deposition of a two-dimensional colloidal crystal (2DCC) followed by gold sputtering. The gold structure is then de-coupled from the 2DCC by etching in hydrofluoric acid, revealing a uniform array of gold nanopots that can be encapsulated in a flexible polymer resin or transferred onto a variety of substrates. The optical properties of gold nanopots are also discussed.
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