This work presents a novel fiber-integrated square-core hollow-core waveguide (HCW) fabricated via 3D nanoprinting, enabling high-precision nanoparticle tracking analysis (NTA) with near-aberration-free imaging. Finite element modeling (FEM) simulations performed with JCMsuite software were used to analyze the intensity distribution, polarization, and modal attenuation of leaky core modes within the HCW. The simulations provided critical insights into the guiding mechanism (anti-resonance effect), confirmed the high-purity excitation of the fundamental mode from the fiber, and aided in the design of the waveguide for optimal performance in NTA experiments.
D. Pereira, et al. 3D nanoprinted fiber-interfaced hollow-core waveguides for high-accuracy nanoparticle tracking analysis. Light Sci. Appl. 14, 197 (2025).