Minimum-Thermal-Disturbance Nanoparticle Fiber Optical Tweezers Using High-Order Bessel-Like Hollow Beam

This paper presents a novel advancement in optical manipulation by developing fiber optical tweezers (OTs) that employ a high-order Bessel-like hollow beam, enabling precise and stable trapping of nanoparticles. By splicing a 405-nm single-mode fiber (SMF) with a 1310-nm SMF and creating a parabolic-shaped tip, we have crafted a nanoscale optical trap that overcomes the diffraction limit and significantly reduces thermal disturbances. The advanced fiber OTs have been successfully tested, demonstrating their efficiency in trapping 100-nm diameter polystyrene spheres with a low average trapping power of 1.2 mW and achieving a laser intensity of 7.37×10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sup> W/m<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>. This performance represents a substantial improvement over conventional fiber optical tweezers. We have confirmed the system's capability for stable, three-dimensional nanoparticle manipulation through comprehensive simulations and experimental tests, showcasing its wide-ranging potential applications in biophysics, chemistry, and nanotechnology.