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Schematic of NPTP processes. (a) A thin gold film is coated on a glass slide. (b) A 1D grating PDMS mold is placed on top of a gold thin film followed by laser pulse illumination. (c) Gold nanowires form after exposure. (d) Rotate the PDMS mold and repeat the above processes (b). (e) Isolated gold squares form. (f) Gold squares bead up and form nanospheres after flood laser exposure.
(a) PDMS mold with a periodicity of is positioned in contact with a 10 nm gold film on a glass substrate. (b) Electric field distribution simulated using the FDTD method. (c) Energy density distribution plotted on the gold surface.
Photothermal annealed periodic structures. (a) 380 nm wide gold nanowires; (b) gold squares; (c) 400 nm diameter gold nanospheres form orthogonal array after flood exposure; (d) hexagonal gold nanosphere array.
NPTP printing of arbitrary gold structures (a) PDMS phase-shifting mask used to print arbitrary patterns; [(b)–(e)] arbitrary gold patterns printed using NPTP; (f) “UCLA” pattern with smallest line width of .
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