Self-assembled plasmonic nanohole arrays

Si Hoon Lee, Kyle C. Bantz, Nathan C. Lindquist, Sang Hyun Oh, Christy L. Haynes

Research output: Contribution to journalArticlepeer-review

154 Scopus citations


We present a simple and massively parallel nanofabrication technique to produce self-assembled periodic nanohole arrays over a millimeter-sized area of metallic film, with a tunable hole shape, diameter, and periodicity. Using this method, 30 × 30 μm 2 defect-free areas of 300 nm diameter or smaller holes were obtained in silver; this area threshold is critical because it is larger than the visible wavelength propagation length of surface plasmon waves (∼27 μm) in the silver film. Measured optical transmission spectra show highly homogeneous characteristics across the millimeter-size patterned area, and they are in good agreement with FDTD simulations. The simulations also reveal intense electric fields concentrated near the air/silver interface, which was used for surface-enhanced Raman spectroscopy (SERS). Enhancement factors (EFs) measured with different hole shape and excitation wavelengths on the self-assembled nanohole arrays were 10 4-10 6.With an additionalAg electroless plating step, theEFwas further increased up to 3×10 6.The periodic nanohole arrays produced using this tunable self-assembly method show great promise as inexpensive SERS substrates as well as surface plasmon resonance biosensing platforms.

Original languageEnglish (US)
Pages (from-to)13685-13693
Number of pages9
Issue number23
StatePublished - Dec 1 2009


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