Hybrid photonic/plasmonic ZnO/Au composites for sensing applications

J A Zapien,Liu Yu,Chaphang To,Chen Limiao,Jaroslav Kovac, I Bello,S T Lee

Advanced Semiconductor Devices & Microsystems（2010）

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摘要

We have studied the enhancement factors (EF) in Surface Enhanced Raman Scattering (SERS) substrates prepared with self assembled ZnO nanorod arrays and Au nanocrystals. The ZnO/Au composite nanoarrays present experimental EF values as high as ~07 for detection of Rhodamine 6G (R6G) using an excitation wavelength of 633 nm. We have study the EF via numerical simulations of a single ZnO/Au composite nanorod using a FDTD algorithm. Our results indicate that the coupling between the photonic wave guiding in the ZnO nanorod and the plasmonic resonance in the Au nanocrystals plays a significant role in the observed EF and need to be considered to fully understand and optimize the development of high efficiency, reproducible, and stable SERS substrates.

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关键词

ii-vi semiconductors,chemical sensors,finite difference time-domain analysis,gold,nanocomposites,nanorods,nanosensors,plasmonics,self-assembly,surface enhanced raman scattering,wide band gap semiconductors,zinc compounds,fdtd algorithm,r6g,rhodamine 6g detection,sers substrate,zno-au,enhancement factor,hybrid photonic-plasmonic composite nanoarray,nanocrystal,numerical simulation,photonic wave guiding,plasmonic resonance,self assembled zno nanorod array,sensing application,surface enhanced raman scattering substrate,nanocrystals,raman scattering,self assembly,zinc oxide,finite difference methods

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