Nanoimprint fabrication of gold nanocones with approximately 10 nm tips for enhanced optical interactions.
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.
Kontio
Juha M
JM
Optoelectronics Research Centre, Tampere University of Technology, Department of Physics, Optics Laboratory, Tampere, Finland. juha.kontio@tut.fi
Husu
Hannu
H
Simonen
Janne
J
Huttunen
Mikko J
MJ
Tommila
Juha
J
Pessa
Markus
M
Kauranen
Martti
M