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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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Raman Spectroscopy: Overview01:20

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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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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Compact integrated optical system for a tip-enhanced Raman spectrometer.

Ming Tang, Fan Xianguang, Xin Wang

    Applied Optics
    |May 3, 2017
    PubMed
    Summary
    This summary is machine-generated.

    A new integrated optical system improves tip-enhanced Raman spectroscopy (TERS) instruments by increasing efficiency and reducing size and cost. This compact TERS system offers high performance for advanced chemical analysis.

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    Area of Science:

    • Optics and Spectroscopy
    • Nanotechnology
    • Chemical Analysis

    Background:

    • Traditional tip-enhanced Raman spectroscopy (TERS) instruments suffer from low optical efficiency, poor coordination, large size, and high costs.
    • These limitations hinder the widespread adoption and practical application of TERS technology.

    Purpose of the Study:

    • To develop a compact integrated optical system for TERS.
    • To overcome the limitations of traditional TERS instruments, focusing on improving optical efficiency, coordination, size, and cost.

    Main Methods:

    • Integration of excitation, collection, white light illumination, micro-imaging, and Raman spectrometer optics into a single system.
    • Simplification of optical pathways and improvement of the Raman spectrometer structure.
    • Coupling the integrated optical system with a homemade scanning tunneling microscope (STM) head and a cooperative control circuit.

    Main Results:

    • Achieved high optical efficiency and high resolving power.
    • Significantly reduced the overall size and complexity of the TERS instrument.
    • Demonstrated a compact and cost-effective integrated TERS system.

    Conclusions:

    • The developed compact integrated optical system effectively addresses the drawbacks of conventional TERS instruments.
    • The new system offers a promising solution for advanced chemical analysis with enhanced performance and portability.