@article{Kumar:2016:10.1021/acsami.5b12157,
author = {Kumar, S and Johnson, TW and Wood, CK and Qu, T and Wittenberg, NJ and Otto, L and Shaver, J and Long, NJ and Victoria, RH and Edel, JB and Oh, SH},
doi = {10.1021/acsami.5b12157},
journal = {Acs Applied Materials & Interfaces},
pages = {9319--9326},
title = {Template-Stripped Multifunctional Wedge and Pyramid Arrays for Magnetic Nanofocusing and Optical Sensing},
url = {http://dx.doi.org/10.1021/acsami.5b12157},
volume = {8},
year = {2016}
}

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TY  - JOUR
AB  - We present large-scale reproducible fabrication of multifunctional ultrasharp metallic structures on planar substrates with capabilities including magnetic field nanofocusing and plasmonic sensing. Objects with sharp tips such as wedges and pyramids made with noble metals have been extensively used for enhancing local electric fields via the lightning-rod effect or plasmonic nanofocusing. However, analogous nanofocusing of magnetic fields using sharp tips made with magnetic materials has not been widely realized. Reproducible fabrication of sharp tips with magnetic as well as noble metal layers on planar substrates can enable straightforward application of their material and shape-derived functionalities. We use a template-stripping method to produce plasmonic-shell-coated nickel wedge and pyramid arrays at the wafer-scale with tip radius of curvature close to 10 nm. Further we explore the magnetic nanofocusing capabilities of these ultra-sharp substrates deriving analytical formulas and comparing the results with computer simulations. These structures exhibit nanoscale spatial control over the trapping of magnetic microbeads and nanoparticles in solution. Additionally, enhanced optical sensing of analytes by these plasmonic-shell-coated substrates is demonstrated using surface-enhanced Raman spectroscopy. These methods can guide the design and fabrication of novel devices with applications including nanoparticle manipulation, biosensing, and magnetoplasmonics.
AU  - Kumar,S
AU  - Johnson,TW
AU  - Wood,CK
AU  - Qu,T
AU  - Wittenberg,NJ
AU  - Otto,L
AU  - Shaver,J
AU  - Long,NJ
AU  - Victoria,RH
AU  - Edel,JB
AU  - Oh,SH
DO  - 10.1021/acsami.5b12157
EP  - 9326
PY  - 2016///
SN  - 1944-8252
SP  - 9319
TI  - Template-Stripped Multifunctional Wedge and Pyramid Arrays for Magnetic Nanofocusing and Optical Sensing
T2  - Acs Applied Materials & Interfaces
UR  - http://dx.doi.org/10.1021/acsami.5b12157
UR  - http://hdl.handle.net/10044/1/29217
VL  - 8
ER  - 

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