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Updated: Jun 7, 2026

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Second-harmonic generation in optically trapped nonlinear particles with pulsed lasers.

L Malmqvist, H M Hertz

    Applied Optics
    |November 6, 2010
    PubMed
    Summary
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    Pulsed lasers enable simultaneous optical trapping and second-harmonic generation in nonlinear nanoparticles. These particles can serve as probes for near-field optical microscopy.

    Area of Science:

    • Nonlinear optics
    • Optical trapping
    • Nanophotonics

    Background:

    • Nonlinear optical (NLO) nanoparticles offer unique light-matter interactions.
    • Optical trapping provides precise manipulation of micro- and nanoparticles.
    • Simultaneous optical trapping and NLO processes are desirable for advanced microscopy and sensing.

    Purpose of the Study:

    • To investigate simultaneous single-beam optical trapping and second-harmonic generation (SHG) in nonlinear nanoparticles.
    • To evaluate the performance of KTP and LiNbO(3) particles under pulsed laser irradiation.
    • To explore the potential of these particles as probes for near-field optical microscopy.

    Main Methods:

    • Utilized pulsed lasers (Nd:YAG and Ti:sapphire) for optical trapping.

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    Last Updated: Jun 7, 2026

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  • Investigated 50-100 nm nonlinear particles (KTP and LiNbO(3)).
  • Measured emission power of frequency-doubled light, trapping stability, and particle degradation.

    • Main Results:

    • Achieved simultaneous three-dimensional optical trapping and SHG in nonlinear particles.
    • Detected 1 pW-10 nW of frequency-doubled light from stably trapped particles.
    • Observed particle degradation under laser irradiation, indicating stability limits.

    Conclusions:

    • Demonstrated the feasibility of using pulsed lasers for simultaneous optical trapping and SHG in nonlinear nanoparticles.
    • Highlighted the potential of these NLO nanoparticles as probes for nonintrusive near-field optical microscopy.
    • Identified laser parameters and particle properties as critical factors for stable trapping and efficient SHG.