Low-order-mode optical trapping of microspheres in hollow-core photonic crystal fibers

Hollow-core photonic crystal fibers (HC-PCFs) are a highly appealing tool for the optical trapping of micron-sized dielectric probes. Indeed, controlling the optical modes of HC-PCFs through diffractive spatial light modulators might lead to generate specific and accurate three-dimensional traps. Here, optical traps suitable for controlling dielectric nano- and microspheres using near-infrared wavelengths inside a HC-PCF are analyzed in depth, through a generalized Lorenz-Mie theory approach. The method provides an accurate and enhanced description of versatile trapping configurations, including optical conveyor belts. The applications of these trapping techniques can be various and important, including the development of optical sensors based on the light-matter interaction in the core.