Two-dimensional, periodic mushroomlike nanostructures for SERS applications

H. Matthew Chen; Lin Pang; Grace M. Huang; Lee Cambrea; Yeshaiahu Fainman

doi:10.1117/12.909591

2 February 2012 Two-dimensional, periodic mushroomlike nanostructures for SERS applications

H. Matthew Chen, Lin Pang, Grace M. Huang, Lee Cambrea, Yeshaiahu Fainman

Proceedings Volume 8231, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII; 82310T (2012) https://doi.org/10.1117/12.909591
Event: SPIE BiOS, 2012, San Francisco, California, United States

Abstract

Two-dimensional, large-area, periodic mushroomlike metallodielectric nanostructures have been simulated, fabricated, and characterized for biosensing applications. Simulations show high electrical field around the tips of the structure. The fabrication process consists of using holographic lithography to create 2-D periodic nanohole array. Subsequently, oblique metal deposition on the nanohole array results in mushroomlike nanostructure with a cavity underneath the void space. The precise geometry of the nanocavity is dependent on the deposition time (thickness). The periodicity of the array was designed to excite propagating surface plasmon resonance (SPR) modes, while the geometric shape of the nanostructure excites localized plasmons on its edges. The coupling between these two phenomena results in higher electric field and thus higher enhancement factor than conventional nanohole array over the whole substrate area ( > 4 cm²). By analyzing the Raman mode of the adsorbed benzenethiol on the surface, the surface enhanced Raman scattering (SERS) enhancement factor of greater than 10⁶ has been measured. Due to its moderately-high enhancement factor, large-area array, and low-cost fabrication method, this nanostructure can be used for future SERS biosensing applications.

Citation Download Citation

H. Matthew Chen, Lin Pang, Grace M. Huang, Lee Cambrea, and Yeshaiahu Fainman "Two-dimensional, periodic mushroomlike nanostructures for SERS applications", Proc. SPIE 8231, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII, 82310T (2 February 2012); https://doi.org/10.1117/12.909591

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