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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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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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.
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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Coherent THz Hyper-Raman: Spectroscopy and Application in THz Detection.

Arianna Ceraso1, Sen Mou2, Andrea Rubano3,4

  • 1Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci, 32, I-20133 Milano, Italy.

Materials (Basel, Switzerland)
|November 28, 2019
PubMed
Summary

Scientists discovered a new nonlinear optical effect called THz hyper-Raman (THYR) scattering. This technique uses terahertz (THz) and optical pulses to reveal low-energy excitations in materials like quartz.

Keywords:
GaSeTHz pulse detectionTHz-TDS spectroscopycrystalline quartznonlinear THz opticsphononspolaritons

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Area of Science:

  • Nonlinear optics
  • Terahertz (THz) spectroscopy
  • Condensed matter physics

Background:

  • Standard optical techniques struggle to probe certain low-energy excitations in materials.
  • Terahertz (THz) spectroscopy offers unique insights but requires advanced detection methods.

Purpose of the Study:

  • To introduce and demonstrate a novel nonlinear optical effect, THz hyper-Raman (THYR) scattering.
  • To showcase the capabilities of THYR for material characterization and THz pulse detection.

Main Methods:

  • Utilizing femtosecond optical pulses and intense, sub-picosecond terahertz (THz) pulses.
  • Generating THz-optical four- and five-wave mixing in crystalline materials.
  • Analyzing the time- and wavelength-resolved spectrum of the generated signal.

Main Results:

  • Observed THYR scattering with distinct Stokes and anti-Stokes sidebands near the optical second harmonic frequency.
  • Applied THYR to α-quartz, revealing spectroscopic information on polaritons and phonons.
  • Demonstrated THYR's advantage in detecting ultra-broadband THz pulses in gallium selenide.

Conclusions:

  • The THz hyper-Raman (THYR) technique provides valuable spectroscopic data on low-energy excitations.
  • THYR offers a powerful new tool for studying materials and characterizing THz pulses.