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Updated: Jan 29, 2026

Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor IRIS
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Broadband interferometric subtraction of optical fields.

T Buberl, P Sulzer, A Leitenstorfer

    Optics Express
    |February 9, 2019
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel interferometer for highly sensitive gas detection. This technique achieves precise destructive interference, significantly improving the detection of molecular vibrations for advanced spectroscopy.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Physical Chemistry

    Background:

    • Mach-Zehnder interferometers are crucial for optical measurements.
    • Achieving high extinction ratios is vital for sensitive detection.
    • Broadband excitation can obscure weak molecular signals.

    Purpose of the Study:

    • To present a novel Mach-Zehnder-like interferometer.
    • To achieve simultaneous super-octave destructive interference.
    • To enhance the detection of coherent molecular vibrational emission.

    Main Methods:

    • Designed a Mach-Zehnder-like interferometer.
    • Utilized unbalanced Fresnel reflections for achromatic nulling.
    • Introduced a methane gas sample for testing.

    Main Results:

    • Achieved super-octave (950 - 2100 nm) destructive interference.
    • Obtained an intensity extinction ratio of 4 × 10-4.
    • Demonstrated isolation of coherent molecular vibrational emission.

    Conclusions:

    • The novel interferometer concept offers improved sensitivity for gas sensing.
    • This technique benefits applications requiring high detection sensitivity and dynamic range.
    • Potential applications include time-domain and frequency-domain spectroscopy.