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Rapid direct laser writing of desired plasmonic nanostructures

Quang Cong Tong, Mai Hoang Luong, Jacqueline Remmel, Minh Thanh Do, Dam Thuy Trang Nguyen, and Ngoc Diep Lai, Opt. Lett. 42, 2382-2385 (2017).

We demonstrate a direct way to realize arbitrary gold nanostructures via a local dewetting method. This technique was based on the optically induced local thermal effect at the focusing region of a direct laser writing (DLW) system employing a green continuous-wave laser. The local high temperature allowed the creation of gold nano-islands only at the focusing area of the optical system. By moving the focusing spot, this DLW method allowed us to “write” desired two-dimensional gold patterns with a feature size down to sub-lambda. A heat model was also proposed to theoretically explain the localized heating process of the absorbing gold layer. The preliminary results were demonstrated for data storage and color printer applications.

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