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Issue 7, 2019
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The extraordinary optical transmission and sensing properties of Ag/Ti composite nanohole arrays

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Abstract

Ag/Ti composite nanohole arrays are fabricated by a simple combination of nanosphere lithography, reactive ion etching, and dual e-beam deposition techniques. Based on the X-ray diffraction, conductivity, and ellipsometry measurements, there exists a Ag composition threshold CAg = 80 at% above which Ag is percolated through the entire film. Significant extraordinary optical transmission (EOT) is observed in nanohole samples with composition larger than the threshold. The main EOT peak position, the (1,0) Ag/glass resonance peak, redshifts as the CAg value decreased, but its index sensitivity monotonically increased with CAg till a value of 300 RIU nm−1 for the CAg = 100 at% sample is achieved. However, the LSPR peak of the nanoholes can achieve a sensitivity of 390 nm RIU−1 when CAg decreases from 100 at% to 85 at%. This study demonstrates that besides the shape, size, and measurement configuration, the resonances and sensitivities of nanohole arrays can be effectively predicted and tuned by the composition of a plasmonic composite.

Graphical abstract: The extraordinary optical transmission and sensing properties of Ag/Ti composite nanohole arrays

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Article information


Submitted
18 Dec 2018
Accepted
21 Jan 2019
First published
21 Jan 2019

Phys. Chem. Chem. Phys., 2019,21, 3771-3780
Article type
Paper
Author version available

The extraordinary optical transmission and sensing properties of Ag/Ti composite nanohole arrays

S. Larson, D. Carlson, B. Ai and Y. Zhao, Phys. Chem. Chem. Phys., 2019, 21, 3771
DOI: 10.1039/C8CP07729K

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