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Proceedings Paper

Optical response of large-area aluminum-coated nano-bucket arrays on flexible PET substrates
Author(s): Donna Hohertz; Yindar Chuo; Badr Omrane; Clint Landrock; Karen L. Kavanagh
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Paper Abstract

The high-cost of fabrication of nanohole arrays for extraordinary optical transmission, surface-plasmon-resonance-based sensors, inhibits their widespread commercial adoption. Production typically involves the application of small-area patterning techniques, such as focused-ion-beam milling, and electron-beam lithography onto high-cost gold-coated substrates. Moving to lower-cost manufacturing is a critical step for applications such as the detection of environmental oil-leaks, or water quality assurance. In these applications, the sensitivity requirements are relatively low, and a bio-compatible inert surface, such as gold, is unnecessary. We report on the optical response of aluminum-coated nano-bucket arrays fabricated on flexible polyethylene terephthalate substrates. The arrays are fabricated using an economical roll-to-roll UV-casting process from large sheets of nickel templates generated from master quartz stamps. The nano-featured surface is subsequently coated with 50 nm of thermally-evaporated aluminum. The roll-to-roll production process has a 97% yield over a 600 m roll producing nano-buckets with 240 nm diameters, 300 nm deep, with a 70° taper. When exposed to a series of refractive index standards (glucose solutions), changes in the locations of the resonance transmission peaks result in optical sensitivities as high as 390 ± 20 nm/RIU. The peak transmission is approximately 5% of illumination, well within the sensitivity requirements of most common low-cost detectors.

Paper Details

Date Published: 25 September 2014
PDF: 12 pages
Proc. SPIE 9288, Photonics North 2014, 92880I (25 September 2014); doi: 10.1117/12.2073268
Show Author Affiliations
Donna Hohertz, Simon Fraser Univ. (Canada)
Yindar Chuo, Nanotech Security Corp. (Canada)
Badr Omrane, Nanotech Security Corp. (Canada)
Clint Landrock, Nanotech Security Corp. (Canada)
Karen L. Kavanagh, Simon Fraser Univ. (Canada)


Published in SPIE Proceedings Vol. 9288:
Photonics North 2014
Steve MacLean; David V. Plant, Editor(s)

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