Three-dimensional plasmonic fields of gold nanostar arrays: Beyond the near-field

Zhu, S; Blakey, I; Cheng, H; Ostrikov, KK

Three-dimensional plasmonic fields of gold nanostar arrays: Beyond the near-field

Zhu, S Blakey, I Cheng, H Ostrikov, KK

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Publication Type:: Journal Article
Citation:: Current Nanoscience, 2016, 12 (5), pp. 592 - 597
Issue Date:: 2016-10-01

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Field	Value	Language
dc.contributor.author	Zhu, S	en_US
dc.contributor.author	Blakey, I	en_US
dc.contributor.author	Cheng, H	en_US
dc.contributor.author	Ostrikov, KK	en_US
dc.date.issued	2016-10-01	en_US
dc.identifier.citation	Current Nanoscience, 2016, 12 (5), pp. 592 - 597	en_US
dc.identifier.issn	1573-4137	en_US
dc.identifier.uri	http://hdl.handle.net/10453/100407
dc.description.abstract	© 2016 Bentham Science Publishers. Background: The performance of plasmonic nanostructures is based on optical properties and the intensity of the electric field. The nature of the nearfields around coinage metal nanoparticles has been well-studied. However, how to project the enhanced electric field to several hundred nanometers distance might be more convenient for the real applications. Methods: In this paper, we examine whether an array of gold nano-stars may be used as enhancement of the electric field to the several hundred nanometers distance. Electron beam lithography was used to fabricate gold nano-star arrays. Near-field optical properties of these arrays were then obtained using near-field scanning optical microscopy (NSOM). The near-field optical properties were also explored with finite-difference time-domain (FDTD) simulations. Results: In the model, a scanning electron microscope image of actual nano-stars was used to build the FDTD targets of 40 nm thickness. The incident wavelength was 532 nm in both simulation and experiment. In the simulations the near-field optical intensity distribution was studied with monitors positioned at various distances (0, 1 and 2 m above the top surface of a nano-star). The FDTD results were found to be consistent with the experimental NSOM results. Conclusion: We found that the field enhancement is not only localized to the individual nanostars but also projected several hundred nanometers into the space. Such an array could be potential used to probe the intracellular environment of an adjacent cell or near-field imaging.	en_US
dc.relation.ispartof	Current Nanoscience	en_US
dc.relation.isbasedon	10.2174/1573413712666160407130521	en_US
dc.subject.classification	Nanoscience & Nanotechnology	en_US
dc.title	Three-dimensional plasmonic fields of gold nanostar arrays: Beyond the near-field	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	12	en_US
utslib.for	1007 Nanotechnology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access
pubs.issue	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	12	en_US

Abstract:

© 2016 Bentham Science Publishers. Background: The performance of plasmonic nanostructures is based on optical properties and the intensity of the electric field. The nature of the nearfields around coinage metal nanoparticles has been well-studied. However, how to project the enhanced electric field to several hundred nanometers distance might be more convenient for the real applications. Methods: In this paper, we examine whether an array of gold nano-stars may be used as enhancement of the electric field to the several hundred nanometers distance. Electron beam lithography was used to fabricate gold nano-star arrays. Near-field optical properties of these arrays were then obtained using near-field scanning optical microscopy (NSOM). The near-field optical properties were also explored with finite-difference time-domain (FDTD) simulations. Results: In the model, a scanning electron microscope image of actual nano-stars was used to build the FDTD targets of 40 nm thickness. The incident wavelength was 532 nm in both simulation and experiment. In the simulations the near-field optical intensity distribution was studied with monitors positioned at various distances (0, 1 and 2 m above the top surface of a nano-star). The FDTD results were found to be consistent with the experimental NSOM results. Conclusion: We found that the field enhancement is not only localized to the individual nanostars but also projected several hundred nanometers into the space. Such an array could be potential used to probe the intracellular environment of an adjacent cell or near-field imaging.

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http://hdl.handle.net/10453/100407