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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Optical force decoration of 3D microstructures with plasmonic particles.

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    Optical forces aggregate gold nanorods on substrates, creating hotspots for protein identification via surface-enhanced Raman scattering (SERS). Slower aggregation on curved surfaces enables sensitive biosensing in liquids.

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    Area of Science:

    • Nanotechnology
    • Biophotonics
    • Spectroscopy

    Background:

    • Surface-enhanced Raman scattering (SERS) is a powerful technique for sensitive molecular detection.
    • Controlling the assembly of plasmonic nanoparticles is crucial for optimizing SERS performance.
    • Protein identification in liquid environments presents significant analytical challenges.

    Purpose of the Study:

    • To utilize optical forces for controlled aggregation of gold nanorods on various substrates.
    • To investigate the influence of substrate curvature on nanoparticle aggregation dynamics.
    • To develop a rapid method for creating hybrid micro/nanosensors for biological detection.

    Main Methods:

    • Employing optical forces to manipulate and aggregate gold nanorods.
    • Utilizing substrates with varying curvatures.
    • Monitoring the increase in SERS signal to quantify protein detection.
    • Developing a geometrical model to explain aggregation dynamics.

    Main Results:

    • Successful aggregation of gold nanorods onto substrates, forming SERS-active hot spots.
    • Observation of slower gold nanorod aggregation on curved surfaces compared to flat ones.
    • Correlation between substrate curvature and aggregation time, explained by a geometrical model.
    • Demonstration of hybrid micro/nanosensors for sensitive protein detection in liquid.

    Conclusions:

    • Optical force-driven gold nanorod aggregation provides a versatile method for creating SERS substrates.
    • Substrate geometry significantly impacts nanoparticle aggregation kinetics, offering tunable control.
    • This technique enables rapid fabrication of highly sensitive biosensors for real-time biological analysis.