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Proceedings Paper

Free-standing chiral plasmonics
Author(s): Eunice Sok Ping Leong; Jie Deng; Siji Wu; Eng Huat Khoo; Yan Jun Liu
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Paper Abstract

Chiral plasmonic nanostructures offer the ability to achieve strong optical circular dichroism (CD) activity over a broad spectral range, which has been challenging for chiral molecules. Chiral plasmonic nanostructures have been extensively studied based on top-down and bottom-up fabrication techniques. Particularly, in the top-down electron-beam lithography, 3D plasmonic nanostructure fabrication involves layer-by-layer patterning and complex alignment, which is time-consuming and causes many defects in the structures. Here, we present a free-standing 3D chiral plamonic nanostructures using the electron-beam lithography technique with much simplified fabrication processes. The 3D chiral plasmonic nanostructures consist of a free-standing ultrathin silicon nitride membrane with well-aligned L-shape metal nanostructures on one side and disk-shape ones on the other side. The free-standing membrane provides an ultra-smooth metal/dielectric interface and uniformly defines the gap between the upper and lower layers in an array of chiral nanostructures. Such free-standing chiral plasmonic nanostructures exhibit strong CD at optical frequencies, which can be engineered by simply changing the disk size on one side of the membrane. Experimental results are in good agreement with the finite-difference time-domain simulations. Such free-standing chiral plasmonics holds great potential for chirality analysis of biomolecules, drugs, and chemicals.

Paper Details

Date Published: 13 November 2014
PDF: 6 pages
Proc. SPIE 9278, Plasmonics, 927809 (13 November 2014); doi: 10.1117/12.2070978
Show Author Affiliations
Eunice Sok Ping Leong, A*STAR Institute of Materials Research and Engineering (Singapore)
Jie Deng, A*STAR Institute of Materials Research and Engineering (Singapore)
Siji Wu, A*STAR Institute of Materials Research and Engineering (Singapore)
Eng Huat Khoo, A*STAR Institute of High Performance Computing (Singapore)
Yan Jun Liu, A*STAR Institute of Materials Research and Engineering (Singapore)

Published in SPIE Proceedings Vol. 9278:
Xing Zhu; Satoshi Kawata; David J. Bergman; Peter Nordlander; Francisco Javier García de Abajo, Editor(s)

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