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Mid-infrared optical sensing using sub-wavelength gratings.

Brian Hogan, Liam Lewis, Michael McAuliffe

    Optics Express
    |February 9, 2019
    PubMed
    Summary

    This study demonstrates a novel optical sensor using a sub-wavelength grating to detect ethanol in water by measuring its infrared absorption. The sensor also shows potential for detecting changes in refractive index.

    Area of Science:

    • Photonics
    • Chemical Sensing
    • Spectroscopy

    Background:

    • Optical sensors are crucial for analyzing compounds, with a focus on refractive index (RI) detection.
    • Integrated photonic devices are increasingly researched for sensor deployment.
    • Sub-wavelength gratings offer unique optical properties for sensing applications.

    Purpose of the Study:

    • To experimentally demonstrate ethanol detection in aqueous solutions using a sub-wavelength grating.
    • To investigate the sensor's mechanism based on infrared absorption.
    • To theoretically explore the grating's capability for refractive index sensing.

    Main Methods:

    • Experimental interrogation of a sub-wavelength grating sensor.
    • Measurement of ethanol absorption at 9.54 μm in aqueous solution.

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  • Theoretical analysis of the grating sensor's operating principle and RI sensing capabilities.

    • Main Results:

    • Successful experimental detection of ethanol in aqueous solution via its 9.54 μm absorption band.
    • Theoretical finding that increased interaction field enhances analyte absorption.
    • Theoretical demonstration of sub-wavelength gratings' ability to detect real part RI changes.

    Conclusions:

    • Sub-wavelength gratings can serve as effective optical sensors for specific compound detection through absorption.
    • The sensor design enhances analyte interaction, leading to increased absorption signals.
    • This technology holds promise for integrated photonic devices for both absorption and RI sensing.