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Optimal geometry for plasmonic sensing with non-interacting Au nanodisk arrays
Niccolò Michieli1, Ionut Gabriel Balasa1, Boris Kalinic1
1Department of Physics and Astronomy, NanoStructures Group, University of Padova Via Marzolo 8 I-35131 Padova Italy tiziana.cesca@unipd.it.
Nanoscale Advances
|September 22, 2022
Summary
Optimized gold nanodisk arrays show high sensitivity for label-free optical biosensing. Simulations and experiments confirm their potential for cost-effective, high-performance nanosensor applications.
Area of Science:
- Plasmonics
- Nanotechnology
- Biosensing
Background:
- Plasmonic nanoarchitectures are effective for label-free optical biosensing.
- Gold nanodisk arrays offer tunable spectral properties for sensing applications.
Purpose of the Study:
- To systematically investigate and optimize the sensing properties of non-interacting gold nanodisk arrays.
- To maximize sensitivity to analytes and changes in the surrounding medium.
Main Methods:
- Finite element method electrodynamic simulations.
- Cost-effective nanofabrication techniques (sparse colloidal lithography, hollow mask lithography).
- Systematic variation of nanodisk geometrical parameters (diameter, height).
Main Results:
- Tunable plasmonic resonance from visible to near-IR (500-1300 nm).
- Achieved high sensitivities: local sensitivity (S0) of 11.9 RIU⁻¹ and bulk sensitivity (Sbulk) of 662 nm RIU⁻¹.
- Excellent agreement between simulated and experimental results.
Conclusions:
- Optimized gold nanodisk arrays provide state-of-the-art sensing performance.
- Simulation-based optimization is directly applicable to cost-effectively fabricated nanosensors.
- The stability of the optimized parameters ensures reliable sensor performance.
