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    Area of Science:

    • Optics and Photonics
    • Nanotechnology
    • Materials Science

    Background:

    • Advanced optical manipulation requires additional degrees of freedom for tailored optical forces and optomechanical effects.
    • Photonic crystals offer a versatile platform for controlling light-matter interactions.

    Purpose of the Study:

    • To demonstrate the use of photonic crystals for enhanced optical manipulation.
    • To investigate the role of Bloch surface waves (BSWs) and reflection coefficients in optomechanical interactions.
    • To enable controlled switching between optical pulling and pushing forces.

    Main Methods:

    • Utilizing a one-dimensional photonic crystal to excite Bloch surface waves (BSWs).
    • Analyzing the complex reflection coefficient of the photonic crystal.
    • Investigating optical forces acting on a single dipolar bead positioned above the photonic crystal.

    Main Results:

    • Demonstrated enhanced transversal optical pulling and pushing forces on a dipolar bead.
    • Achieved angle- or wavelength-assisted switching between BSW-induced optical pulling and pushing forces.
    • Photonic crystals facilitate precise optical sorting of nanoparticles, overcoming limitations of conventional methods.

    Conclusions:

    • Photonic crystals provide a versatile platform for novel optical manipulation schemes.
    • BSW excitation in photonic crystals enables controlled optomechanical interactions and light-matter enhancement.
    • This approach is promising for precise nanoparticle sorting and advanced optical trapping setups.