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A Multimodal Wide-Field Fourier-Transform Raman Microscope

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Published on: December 30, 2025

Raman enhancement on a broadband meta-surface.

Sencer Ayas¹, Hasan Güner, Burak Türker

¹UNAM Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Turkey. ayas@bilkent.edu.tr

|August 1, 2012

Summary

Researchers developed a novel plasmonic meta-surface using coupled diatomic plasmonic molecules. This design enables broadband, quasi-omnidirectional light manipulation and highly uniform surface-enhanced Raman scattering (SERS) enhancement.

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Area of Science:

Photonics and Metamaterials
Nanophotonics
Plasmonics

Background:

Plasmonic metamaterials enable light confinement to subwavelength scales, offering control over photonic properties.
While optical resonances in plasmonic molecules are studied, the advantages of strong coupling in dimers remain underexplored.

Purpose of the Study:

To investigate the benefits of strong coupling in diatomic plasmonic molecules for meta-surface applications.
To engineer a broadband and quasi-omnidirectional meta-surface with enhanced surface-enhanced Raman scattering (SERS) capabilities.

Main Methods:

Construction of a plasmonic meta-surface by coupling diatomic plasmonic molecules (heavy and light meta-atoms).
Analysis of the resulting band structure arising from coupled localized modes.
Calculation of field enhancement distribution to assess nanoscale uniformity.

Main Results:

The coupled diatomic plasmonic molecules form a rich band structure, leading to a broadband and quasi-omnidirectional meta-surface.
Achieved highly repeatable and spatially uniform SERS enhancement by designing the band structure for simultaneous excitation and scattering resonances.
Demonstrated nanoscale spatial uniformity of field enhancement within the meta-surface unit cell.

Conclusions:

Coupling of diatomic plasmonic molecules offers a pathway to engineer advanced meta-surfaces with tailored optical properties.
The designed meta-surface demonstrates significant potential for highly efficient and uniform SERS applications.
Wavelength conversion in Raman scattering can be interpreted as photonic transitions within the meta-material's engineered bands.