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Quantification of Interface-Dependent Plasmon Quality Factors Using Single-Beam Nonlinear Optical Interferometry.

Tian Zhao1, Megan A Steves1, Brian S Chapman2

  • 1Department of Chemistry , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States.

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This summary is machine-generated.

A novel interferometric nonlinear optical microscope quantifies plasmon mode quality factors in gold nanoparticles. Encapsulating nanoparticles with silica shells significantly enhances their plasmon quality factors, offering insights into environmental influences.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Nonlinear Optics

Background:

  • Quantifying plasmon mode quality factors is crucial for understanding nanoparticle optical properties.
  • Traditional methods may lack the sensitivity or resolution for single-nanoparticle analysis.
  • Environmental factors significantly influence plasmonic behavior.

Purpose of the Study:

  • To develop and validate a novel method for quantifying plasmon mode quality factors.
  • To investigate the effect of silica shell encapsulation on the plasmon quality factors of gold nanorods.
  • To demonstrate the capability of the method for analyzing environmental influences on plasmon responses.

Main Methods:

  • Utilized a collinear single-beam interferometric nonlinear optical (INLO) microscope.
  • Employed phase-stabilized femtosecond laser pulses with tunable temporal delays (attosecond to picosecond).
  • Performed resonant electronic Fourier spectroscopy on single gold nanoparticles.

Main Results:

  • Successfully quantified plasmon mode quality factors and homogeneous linewidths.
  • Demonstrated a 46% increase in quality factor for gold nanorods coated with 20 nm silica shells compared to CTAB-passivated ones.
  • Achieved single-nanoparticle sensitivity with high interpulse phase stability (33 mrad).

Conclusions:

  • The INLO microscopy method provides a straightforward and effective approach for plasmon mode quality factor quantification.
  • Silica shell encapsulation significantly enhances the plasmon quality factor of gold nanorods.
  • The technique is versatile for studying plasmon responses to environmental changes and nanoparticle dynamics.