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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Far-field Raman color superlensing based on disordered plasmonics.

Sergey S Kharintsev

    Optics Letters
    |July 7, 2020
    PubMed
    Summary

    This study demonstrates a novel Raman superlensing effect using a titanium oxynitride metalens. This allows for enhanced stimulated Raman scattering (SRS) with subwavelength resolution, paving the way for advanced nanoscale imaging.

    Area of Science:

    • Nanophotonics
    • Plasmonics
    • Nonlinear Optics

    Background:

    • Plasmon multiple scattering in metal-dielectric media enhances cubic susceptibility.
    • This enhancement enables stimulated Raman scattering (SRS) in confined media under low-power continuous-wave pumping.

    Purpose of the Study:

    • To demonstrate a far-field Raman superlensing effect.
    • To utilize a disordered nonlinear metalens for enhanced SRS.
    • To achieve subwavelength resolution in Raman imaging.

    Main Methods:

    • Fabrication of a percolated 50 nm titanium oxynitride thin film as a metalens.
    • Operating the metalens at epsilon-near-zero (ENZ) wavelengths in the visible and near-infrared regions.
    • Experimental demonstration of Raman superlensing using multiwalled carbon nanotubes.

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    Main Results:

    • Achieved a subwavelength resolution of λ/6NA.
    • Demonstrated the Raman superlensing effect at different SRS overtones.
    • Utilized the metalens for enhanced nonlinear optical phenomena.

    Conclusions:

    • The titanium oxynitride metalens enables efficient Raman superlensing.
    • Subwavelength resolution in SRS is achievable with disordered ENZ materials.
    • This technique offers potential for advanced nanoscale spectroscopy and imaging.