On-chip hollow-core waveguides with integrated anti-resonant channels, enabled by 3D nanoprinting

We present a novel on-chip hollow-core waveguide design featuring a three-channel architecture that operates via the anti-resonant effect. The design incorporates symmetrically arranged thin membranes that create an enhanced reflective environment, achieving superior waveguiding performance over conventional approaches. Through numerical simulations and experimental validation using 3D vertical nanoprinting, we demonstrate low optical losses, smooth spectral transmission, and suppression of structure-induced birefringence while additionally revealing an interchannel coupling mechanism arising from the multi-channel architecture. Our findings establish a promising platform for applications in bioanalytics, quantum technologies, and life sciences while offering new possibilities for exploring complex cladding structures in hollow-core fiber design.