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Direct laser writing of three-dimensional submicron structures using a continuous-wave laser at 532 nm

Direct laser writing of three-dimensional submicron structures using a continuous-wave laser at 532 nm
Author:

M. Thiel, J. Fischer, G. von Freymann, and M. Wegener

Source: Appl. Phys. Lett. 97, 221102 (2010)
Date: 29.11.2010

Abstract:

Three-dimensional direct laser writing is commonly associated with tightly focused femtosecond laser pulses. Although few reports have used continuous-wave lasers instead, it is unclear whether state-of-the-art three-dimensional submicron structures for photonics can be fabricated along these lines. Here, we systematically investigate the underlying mechanisms using a 532 nm continuous-wave laser operating at power levels of only some 10 mW and three different commercially available photoresists. Body-centered cubic woodpile photonic crystals composed of 24 layers with rod spacings as small as 450 nm serve as a demanding benchmark example for illustrating “state-of-the-art.”