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Optical biochemical sensor based on half-circled microdisk laser diode.

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    |October 19, 2017
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel half-circled micro disk laser (HC-MDL) for biochemical sensing, overcoming limitations of conventional designs. The HC-MDL demonstrates high sensitivity for detecting gases like DMMP and ethanol at ppb levels.

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    Area of Science:

    • Integrated photonics
    • Optical sensors
    • Biochemical sensing

    Background:

    • Conventional microdisk sensors face challenges with optical coupling and reproducibility.
    • A novel half-circled micro disk laser (HC-MDL) is proposed to address these limitations.
    • The HC-MDL offers improved manufacturability and directional optical output.

    Purpose of the Study:

    • To propose and experimentally demonstrate a half-circled cavity based microdisk laser diode for integrated photonic biochemical sensing.
    • To evaluate the performance of the HC-MDL in terms of Q-factor and side mode suppression ratio.
    • To assess the gas sensing capabilities of the HC-MDL for specific volatile organic compounds.

    Main Methods:

    • Fabrication of a half-circled micro disk laser.
    • Measurement of the Q-factor using the self-heterodyne method.
    • Gas sensing experiments using dimethyl methylphosphonate (DMMP) and ethanol.

    Main Results:

    • The fabricated HC-MDL achieved a Q-factor of 7.72 × 10^6 and a side mode suppression ratio of 23 dB.
    • A wavelength shift of 14.21 pm was observed for 100 ppb DMMP.
    • A wavelength shift of 14.70 pm was observed for 1 ppm ethanol, indicating high sensitivity detection.

    Conclusions:

    • The HC-MDL sensor demonstrates the potential for highly sensitive gas detection at ppb levels.
    • The HC-MDL is a promising platform for various optical biochemical sensor applications.
    • The design overcomes limitations of traditional microdisk sensors, enhancing usability.