Multiple surface lattice resonances in gold nano-hexagonal prism arrays

 Multiple surface lattice resonances in gold nano-hexagonal prism arrays


Exploring Multiple Surface Lattice Resonances in Gold Nano-Hexagonal Prism Arrays

In recent years, plasmonic nanostructures have gained significant attention for their ability to manipulate light at the nanoscale. One particularly intriguing phenomenon in this field is Surface Lattice Resonance (SLR)—a collective resonance mode arising from the interplay between localized surface plasmon resonances (LSPRs) and diffractive coupling in periodic nanostructure arrays. Among various geometries, gold nano-hexagonal prism arrays stand out due to their unique symmetry and optical response, which enable the observation of multiple SLR modes within a single structure.

Surface Lattice Resonances

SLRs are narrow spectral features that emerge in periodic nanoparticle arrays when the localized plasmon resonances couple with the Rayleigh anomalies of the periodic lattice. Unlike isolated plasmonic modes that suffer from significant radiative losses, SLRs exhibit reduced linewidths and enhanced quality factors, making them ideal for applications in sensing, nonlinear optics, and light-matter interaction control.

Gold Nano-Hexagonal Prisms

Gold is a preferred plasmonic material due to its excellent stability and strong optical response in the visible to near-infrared region. When gold nanostructures are fabricated into hexagonal prism shapes and arranged in a hexagonal lattice, they offer several advantages:

  1. Symmetry-induced coupling effects: The sixfold rotational symmetry of the array supports multiple diffraction orders, promoting rich coupling dynamics and multiple SLR modes.

  2. Tailorable mode profiles: By adjusting the aspect ratio, lattice spacing, and prism orientation, the position and number of SLRs can be precisely engineered.

  3. Multispectral response: This configuration supports multiple resonances across different wavelengths, useful for broadband sensors or multi-channel optical devices.

Experimental Observations and Applications

In practical implementations, arrays of gold nano-hexagonal prisms can be fabricated using electron beam lithography, nanoimprint lithography, or colloidal self-assembly methods. Optical characterization, typically via dark-field spectroscopy or Fourier-transform infrared spectroscopy (FTIR), reveals distinct SLR modes that shift with incident angle, refractive index of the surrounding medium, or lattice parameters.

Applications of multiple SLRs include:

  • Biosensing: Enhanced sensitivity due to narrow linewidths and strong near-field enhancement.

  • Photovoltaics: Improved light harvesting via guided mode coupling.

  • Nonlinear optics: Frequency mixing and harmonic generation with increased efficiency.

  • Quantum optics: Control of spontaneous emission rates in hybrid plasmon-exciton systems.

Research Significance

The study of multiple SLRs in gold nano-hexagonal prism arrays not only advances our fundamental understanding of light-matter interactions in complex geometries but also opens doors to new device architectures in plasmonic circuits, optical filters, and lab-on-a-chip sensors. The ability to support and manipulate multiple resonances in a single nanostructured platform adds versatility to plasmonic design strategies for integrated photonic applications.

Global Particle Physics Excellence Awards


#Sciencefather  
#SurfaceLatticeResonance
#Plasmonics
#Nanophotonics
#NanoOptics
#Metamaterials
#Nanostructures
#LocalizedSurfacePlasmons
#PhotonicCrystals
#GoldNanostructures
#HexagonalPrismArrays

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