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FDTD Simulations for Rhodium and Platinum Nanoparticles for UV Plasmonics.

Andrey Yurevich Zyubin1, Igor Igorevich Kon1, Darya Alexeevna Poltorabatko1

  • 1REC «Fundamental and Applied Photonics. Nanophotonics», Immanuel Kant Baltic Federal University, A. Nevskogo 14, 236016 Kaliningrad, Russia.

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Summary

This study uses FDTD modeling to explore UV plasmonics in rhodium and platinum nanoparticles, comparing their performance to gold and silver for optical sensor applications.

Keywords:
FDTDSERSnanoparticlesoptical sensorsimulationssurfacesultraviolet

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Surface-Enhanced Raman Spectroscopy (SERS) typically relies on gold (Au) and silver (Ag) for plasmonic applications.
  • Exploring alternative transition metals like rhodium (Rh) and platinum (Pt) is crucial for expanding plasmonic functionalities, especially in the UV range.

Purpose of the Study:

  • To theoretically investigate the electromagnetic field distortion and optical properties of Rh and Pt nanoparticles and surfaces using finite-difference time-domain (FDTD) modeling.
  • To compare the UV plasmonic performance of Rh and Pt with traditional SERS metals (Au and Ag).
  • To evaluate the potential of Rh and Pt for developing UV and deep-UV plasmonic optical sensors.

Main Methods:

  • Utilized FDTD mathematical modeling to simulate electromagnetic field distortion near Rh and Pt surfaces on glass substrates.
  • Performed theoretical calculations for UV SERS-active nanoparticles (NPs), including hemispheres and planar surfaces with varying interparticle gaps.
  • Compared simulation results with optical properties of Au and Ag nanostructures (stars, spheres, hexagons).

Main Results:

  • Demonstrated the viability of FDTD modeling for evaluating field amplification and light scattering parameters in UV plasmonic systems.
  • Showcased the potential of Rh and Pt NPs and surfaces for UV plasmonic applications, with performance comparisons to Au and Ag.
  • Identified differences between UV-plasmonic NPs and those operating in the visible spectrum.

Conclusions:

  • The FDTD approach provides a basis for controlled synthesis of tunable colloidal and planar metal-based optical sensors.
  • Rhodium and platinum show promise for biocompatible optical sensors in the UV and deep-UV ranges.
  • This theoretical framework aids in optimizing parameters for advanced plasmonic devices.