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 ( 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.
Highlights
Metallic nanoparticles (NPs) of different sizes and shapes have found applications in many fields such as in optics, photovoltaics, biological imaging, cancer therapies, for the environment, among others [1,2,3,4,5,6]
We provided a theoretical interpretation for localized surface plasmon resonances (LSPRs) in the extinction spectra of
Ag nanospheres (Ag-NSPs), Ag-NPLs, and Ag-NSs produced by chemical reduction
Summary
Metallic nanoparticles (NPs) of different sizes and shapes have found applications in many fields such as in optics, photovoltaics, biological imaging, cancer therapies, for the environment, among others [1,2,3,4,5,6] This interest has been mostly due to the near-field enhancement on the particles surface through excitation of localized surface plasmon resonances (LSPRs), which has been exploited in ultrasensitive biosensing with surface-enhanced Raman spectroscopy (SERS) [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]. The work in this field has been focused on the control of morphology and empirical mechanisms to further enhance the electromagnetic field, while less attention has been given to a theoretical interpretation of some of the observed phenomena
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