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Digital holography based submicron thermometry.

Amin Moradi, Ehsan A Akhlaghi, Faegheh Hajizedeh

    Optics Express
    |December 14, 2016
    PubMed
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    We developed a phase-shifting digital holography method to measure temperature changes around irradiated microparticles. This technique accurately determines surface temperature with 1°C accuracy, confirming theoretical predictions.

    Area of Science:

    • Optical Metrology
    • Thermal Analysis
    • Nanophotonics

    Background:

    • Accurate temperature measurement of microparticles is crucial for understanding laser-matter interactions.
    • Existing methods often lack the precision or spatial resolution required for sub-micron analysis.
    • Investigating thermal profiles around irradiated nanoparticles is key to applications in targeted therapies and nanoscale engineering.

    Purpose of the Study:

    • To introduce and validate a novel phase-shifting digital holography (PSDH) method for precise temperature profiling.
    • To demonstrate the capability of PSDH in analyzing the thermal behavior of irradiated (sub-)micron spherical beads.
    • To achieve high-accuracy temperature determination with a focus on surface temperature.

    Main Methods:

    • Implementation of a Mach-Zehnder interferometer within an open-setup microscope.

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  • Utilizing phase-shifting digital holography for quantitative phase contrast imaging.
  • Application of the method to irradiated gold nanoparticles (400 nm diameter) and silver-coated silica beads in silicone oil.

    • Main Results:

    • The PSDH method successfully determined the temperature profile around irradiated spherical beads.
    • Achieved high accuracy in surface temperature determination, with an error margin of 1 °C.
    • Experimental data demonstrated excellent agreement with theoretical predictions of the temperature distribution.

    Conclusions:

    • Phase-shifting digital holography provides a robust and accurate technique for microparticle thermal analysis.
    • The developed method offers a significant advancement in non-contact, high-resolution temperature metrology.
    • Validated experimental results confirm the theoretical models of heat distribution around laser-irradiated nanoparticles.