We show that nanoimprint lithography combined with electron-beam evaporation provides a cost-efficient, rapid, and reproducible method to fabricate conical nanostructures with very sharp tips on flat surfaces in high volumes. We demonstrate the method by preparing a wafer-scale array of gold nanocones with an average tip radius of 5 nm. Strong local fields at the tips enhance the second-harmonic generation by over 2 orders of magnitude compared with a nonsharp reference.
© 2009 Optical Society of America
Original Manuscript: March 20, 2009
Manuscript Accepted: May 8, 2009
Published: June 24, 2009
Juha M. Kontio, Hannu Husu, Janne Simonen, Mikko J. Huttunen, Juha Tommila, Markus Pessa, and Martti Kauranen, "Nanoimprint fabrication of gold nanocones with ~10 nm tips for enhanced optical interactions," Opt. Lett. 34, 1979-1981 (2009)