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Quantifying Optical Absorption of Single Plasmonic Nanoparticles and Nanoparticle Dimers Using Microstring

Varadarajan Padmanabhan Rangacharya1,2, Kaiyu Wu1,2, Peter Emil Larsen1,2

  • 1Department of Health Technology, DTU Health Tech, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.

ACS Sensors
|June 13, 2020
PubMed
Summary

We developed a novel micromechanical silicon nitride string resonator method to precisely measure optical absorption in individual plasmonic nanoparticles. This technique offers high sensitivity for thermoplasmonics applications.

Keywords:
absorption cross sectionsmicromechanical string resonatorsnanoparticlesplasmonic heatingthermoplasmonics

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Area of Science:

  • Nanotechnology
  • Plasmonics
  • Mechanical Resonators

Background:

  • Thermoplasmonics applications require sensitive methods to measure optical absorption of individual nanoparticles.
  • Existing techniques are often invasive, lack sensitivity, or cannot probe structures with nanogaps.

Purpose of the Study:

  • To introduce micromechanical silicon nitride (SiN) string resonators for quantifying optical absorption cross sections of individual plasmonic nanostructures.
  • To demonstrate a reliable method for analyzing absorption data and discuss influencing factors.

Main Methods:

  • Utilized SiN string resonators to probe optical absorption of various individual plasmonic nanostructures (monomers, dimers, nanospheres, nanostars, shell-isolated nanoparticles, nanocubes).
  • Developed a data treatment method to determine absorption cross sections based on responsivity across the resonator string.
  • Achieved a sensitivity of approximately 89 Hz/K.

Main Results:

  • Successfully quantified optical absorption cross sections of individual plasmonic structures, even when plasmon resonance was distant from the laser excitation wavelength.
  • Experimental results showed good agreement with simulations.
  • Investigated the influence of polarization, surface morphology, and nanogap size on optical absorption.

Conclusions:

  • The developed SiN string resonator method provides a sensitive and reliable tool for probing optical absorption of individual plasmonic nanostructures.
  • This technique overcomes limitations of existing methods, enabling detailed analysis of absorption profiles.
  • Facilitates future advancements and optimization in thermoplasmonics.