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Related Experiment Video

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Engineering Antiviral Agents via Surface Plasmon Resonance

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Published on: June 14, 2022

Surface Plasmon Resonances in Silver Nanostars.

Faustino Reyes Gómez^1,2, Rafael J G Rubira³, Sabrina A Camacho⁴

¹Departamento de Física, Universidad del Valle, AA 25360 Cali, Colombia. faustino.reyes.gomez@gmail.com.

Sensors (Basel, Switzerland)

|November 11, 2018

Summary

Silver nanostars (Ag-NSs) show promise for sensing. Finite-difference time-domain (FDTD) calculations reveal localized surface plasmon resonance (LSPR) mechanisms in Ag-NSs, enabling wavelength tuning for enhanced applications.

Keywords:

Ag nanostars metallic nanoparticles plasmonic biosensing

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Area of Science:

Nanotechnology
Plasmonics
Spectroscopy

Background:

Silver nanostars (Ag-NSs) offer potential for advanced surface-enhanced sensing and spectroscopy.
Understanding the excitation mechanisms of localized surface plasmon resonances (LSPRs) is crucial for optimizing Ag-NS applications.

Purpose of the Study:

To elucidate the mechanisms behind LSPR excitation in Ag-NSs.
To provide a method for tuning LSPR wavelengths in Ag-NSs for sensing applications.

Main Methods:

Utilized finite-difference time-domain (FDTD) calculations.
Modeled Ag-NSs as a combination of crossed nanorods (Ag-NRs).

Main Results:

Successfully reproduced LSPR in Ag-NSs using the crossed nanorod model.
Attributed the spectral tail (λ ≳ 700 nm) to strong dipolar plasmon resonance, not heterogeneity.
Demonstrated a method to tune the strongest LSPR to specific wavelengths.

Conclusions:

The crossed nanorod model accurately describes LSPR in Ag-NSs.
Dipolar resonance, not structural heterogeneity, explains the long-wavelength spectral features.
The findings facilitate the design of Ag-NSs for targeted sensing applications.