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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

847
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...
847

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Related Experiment Video

Updated: Dec 13, 2025

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Raman mediated ultrafast all-optical NOR gate.

Tanmoy Datta, Mrinal Sen

    Applied Optics
    |August 5, 2020
    PubMed
    Summary

    Researchers developed a new all-optical NOR logic device using silicon nanocrystals in a slotted photonic crystal waveguide. This miniaturized device operates at high speeds up to 125 Gbps, leveraging stimulated Raman scattering (SRS).

    Area of Science:

    • Photonics
    • Nanotechnology
    • Optical Computing

    Background:

    • All-optical logic devices are crucial for high-speed information processing.
    • Existing devices often face challenges with size, power consumption, and operational speed.
    • Silicon nanocrystals offer unique optical properties for advanced photonic applications.

    Purpose of the Study:

    • To propose and demonstrate a novel device architecture for all-optical cascadable logic NOR functionality.
    • To achieve significant miniaturization in device footprint and operating power.
    • To enable high-speed optical signal processing.

    Main Methods:

    • Implementation of a device architecture based on stimulated Raman scattering (SRS).
    • Utilizing silicon nanocrystal embedded slotted photonic crystal waveguides (SPCWs).

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  • Demonstration of NOR logic functionality and high-speed operation.

    • Main Results:

    • Achieved ultrahigh SRS gain from silicon nanocrystals.
    • Demonstrated strong spatio-temporal confinement within the SPCW.
    • Successfully operated the device at a high pulse rate of 125 Gbps.
    • Substantial miniaturization in operating power and device footprint.

    Conclusions:

    • The proposed device architecture successfully implements all-optical cascadable NOR logic.
    • The use of silicon nanocrystals and SPCWs leads to miniaturized, low-power, and high-speed optical devices.
    • This technology holds promise for future high-performance optical computing and communication systems.