Au nanoparticle based localized surface plasmon resonance substrates fabricated by dynamic shadowing growth

摘要

Au nanoparticle (NP) substrates, Au NP/TiO2/Au NP sandwich structures, and Ti coated Au NP substrates are fabricated by glancing angle deposition (GLAD) and oblique angle deposition (OAD) methods. Under the same deposition condition, the Au NP substrates produced by GLAD are more uniform and reproducible compared to those fabricated by OAD. The localized surface plasmon resonance (LSPR) wavelength of Au NP substrates can be easily tuned by changing the film thickness, the deposition angle, and the coating of the dielectric layer (TiO2) and metallic layer (Ti). In addition, the thickness and the deposition angle of the Ti coating on Au NP also affect the LSPR wavelength. Our results demonstrate that GLAD is a very versatile fabrication technique to produce reproducible and fine-tuned LSPR substrates.