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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

1.2K
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...
1.2K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

948
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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Related Experiment Video

Updated: Jan 1, 2026

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Prospects for continuous-wave molecular modulation in Raman-active microresonators.

Joshua T Karpel, David C Gold, Deniz D Yavuz

    Optics Express
    |December 28, 2019
    PubMed
    Summary

    We propose novel microresonator-based molecular modulators for efficient optical modulation. These devices achieve 1% modulation efficiency at 10 THz frequencies for any optical wavelength.

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    Area of Science:

    • Optics and Photonics
    • Molecular Spectroscopy
    • Materials Science

    Background:

    • Continuous-wave optical modulation is crucial for optical signal processing.
    • Raman-active microresonators offer enhanced light-matter interactions.
    • Existing molecular modulation techniques have limitations in frequency and efficiency.

    Purpose of the Study:

    • To extend existing molecular modulation techniques to Raman-active microresonators.
    • To introduce a new class of devices: microresonator-based molecular modulators.
    • To investigate the potential for high-frequency and high-efficiency optical modulation.

    Main Methods:

    • Utilizing intense pump and Stokes modes within a microresonator.
    • Preparing high coherence of the Raman transition between ro-vibrational states.
    • Performing numerical simulations to predict modulation efficiency.

    Main Results:

    • Demonstrated the feasibility of using Raman-active microresonators for molecular modulation.
    • Predicted modulation efficiencies on the order of 1%.
    • Achieved potential for modulation at 10 THz-scale frequencies across the optical spectrum.

    Conclusions:

    • Microresonator-based molecular modulators represent a significant advancement in optical modulation technology.
    • These devices offer a pathway to efficient, broadband optical modulation.
    • The proposed technique holds promise for applications in optical communications and signal processing.