Engineered plasmonic Thue-Morse nanostructures for LSPR detection of the pesticide Thiram

Nanophotonics

article

Massimo Rippa¹  Riccardo Castagna¹  Marianna Pannico¹  Pellegrino Musto²  Volodymyr Tkachenko¹  Jun Zhou¹  Lucia Petti¹ 

[1] Institute of Applied Sciences and Intelligent Systems “E. Caianiello” of CNR;Institute for Polymers;Physics Department, University of Naples “Federico II”;Institute of Photonics, Faculty of Science, Ningbo University

关键词: plasmonic;    nanostructures;    sensors;    LSPR;    Thiram;   

DOI  :  10.1515/nanoph-2016-0146

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

In this paper, the size- and shape-dependent spectral characteristics of plasmonic nanostructures based on the Thue-Morse (ThMo) sequence are investigated in theory and experiment. We designed, fabricated, and characterized nine different Au nanopillars (NPs) lattices to evaluate their use as nanosensors based on localized surface plasmon resonances (LSPR). The extinction spectra and the bulk refractive index sensitivity ( m ) are compared to three selected shapes of the NPs (square, circular, and triangular) with different minimum interparticle distance. The maximum m of 275 nm/RIU is obtained for a ThMo pattern with square NPs. Finally, a detection limit of 260 pM (62 pg/ml) of Thiram pesticide has been achieved using an LSPR nanosensor based on an optimized ThMo pattern with triangular NPs employing a phase-sensitive setup to increase the figure-of-merit (FOM) of the sensor.

【 授权许可】

CC BY