In this paper, we demonstrate that the glancing angle deposition (GLAD) technique is a competitive and efficient method to fabricating a nanostructured surface that enhances the sensitivity of surface plasmon resonance (SPR) sensors, because of its simplicity and unique characteristics of material selection. The theoretical investigations were conducted by employing a rigorous coupled-wave analysis for design metrics, i.e., shift in resonance angle, SPR curve angular width, and minimum reflectance at resonance. An optimized geometry was achieved with enhanced characteristics of the SPR sensor. The SPR features of hybrid GLAD nanostructures deposited onto metallic thin films were investigated. An optical setup that used the Kretschmann-Reather configuration was utilized to monitor changes in the refractive index of water solution using the optical power interrogation method. The experimental results demonstrate that the SPR sensor fabricated with hybrid GLAD nanostructures of 30 nm height and ~ 12 nm inter-structural gap size achieved the sensitivity ~ 4× higher that of a than conventional SPR sensor.
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glancing angle deposition
surface plasmon resonance
localized surface plasmon resonance
rapid thermal annealing
surface-enhanced Raman spectroscopy
curve angular width
minimum reflectance at resonance
rigorous coupled wavelength analysis
scanning electron microscopy
atomic force microscopy
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This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIP) (No. 2015R1A5A1037668) and Australian Endeavour Award (2017–2018) funded by the Australian Ministry of Education.
The authors declare that they have no competing interests.
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Badshah, M.A., Michel, D., Alam, N.E. et al. Enhancing the Sensitivity of a Surface Plasmon Resonance Sensor with Glancing Angle Deposited Nanostructures. Plasmonics (2020). https://doi.org/10.1007/s11468-020-01245-0
- Glancing angle deposition
- Surface plasmon resonance
- Localized surface plasmon resonance
- Refractive index