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Engineering Antiviral Agents via Surface Plasmon Resonance
Published on: June 14, 2022
Surface Plasmon Resonances in Silver Nanostars
Faustino Reyes Gómez1,2, Rafael J G Rubira3, Sabrina A Camacho4
1Departamento de Física, Universidad del Valle, AA 25360 Cali, Colombia. faustino.reyes.gomez@gmail.com.
Abstract:
The recent development of silver nanostars (Ag-NSs) is promising for improved surface-enhanced sensing and spectroscopy, which may be further exploited if the mechanisms behind the excitation of localized surface plasmon resonances (LSPRs) are identified. Here, we show that LSPRs in Ag-NSs can be obtained with finite-difference time-domain (FDTD) calculations by considering the nanostars as combination of crossed nanorods (Ag-NRs). In particular, we demonstrate that an apparent tail at large wavelengths ( λ ≳ 700 nm) observed in the extinction spectra of Ag-NSs is due to a strong dipolar plasmon resonance, with no need to invoke heterogeneity (different number of arms) effects as is normally done in the literature. Our description also indicates a way to tune the strongest LSPR at desired wavelengths, which is useful for sensing applications.
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