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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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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Related Experiment Video

Updated: Jun 3, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Thin-wall silica capillary-based multimode interferometer for high-sensitivity refractive index measurement.

Mariline M Costa, Ana I Freitas, Jörg Bierlich

    Optics Letters
    |June 1, 2026
    PubMed
    Summary
    This summary is machine-generated.

    A new silica capillary tube (SCT) sensor precisely monitors liquid refractive index (RI) with ultrahigh sensitivity. This low-cost device offers remarkable potential for real-time chemical processing applications.

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    Area of Science:

    • Photonics and optical sensing.
    • Materials science for fiber optics.

    Background:

    • Refractive index (RI) monitoring is crucial in chemical processing.
    • Existing sensors may lack the sensitivity or cost-effectiveness required for real-time applications.

    Purpose of the Study:

    • To propose a novel sensor for external liquid RI monitoring.
    • To achieve ultrahigh sensitivity using a controlled collapse of a silica capillary tube.

    Main Methods:

    • Fabrication of a sensor by splicing a thin-wall silica capillary tube (SCT) between two single-mode fibers.
    • Controlled collapse of the SCT hollow core to create a conical splice.
    • Excitation of multimodal interference in the SCT cladding.
    • Analysis of dominant frequencies for RI measurement.

    Main Results:

    • Achieved a maximum sensitivity of 4421 nm/RIU for RI in the range of 1.333-1.341.
    • Demonstrated an outstanding performance for an all-silica-based device in this RI range.
    • Developed a low-cost, one-step fabrication process.

    Conclusions:

    • The novel SCT sensor exhibits ultrahigh sensitivity for RI monitoring.
    • The sensor's performance indicates significant potential for real-time detection in chemical processing.
    • This all-silica device offers a promising, cost-effective solution for precise RI monitoring.