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Silica nanofibers fabricated by tapering optical fibers have attractedconsiderable interest as an ultimate platform for high-efficiency light-matterinteractions. While previously demonstrated applications relied exclusively onthe low-loss transmission of only the fundamental mode, the implementation ofmultimode tapers that adiabatically transmit several modes has remained verychallenging, hindering their use in various emerging applications in multimodenonlinear optics and quantum optics. Here, we report the first realization ofmultimode submicron tapers that permit the simultaneous adiabatic transmissionof multiple higher-order modes including the LP02 mode, through introducingdeep wet-etching of conventional fiber before fiber tapering. Furthermore, as acritical application, we demonstrate 'fundamental-to-fundamental' all-fiberthird-harmonic generation with high conversion efficiencies. Our work paves theway for ultrahigh-efficiency multimode nonlinear and quantum optics,facilitating nonclassical light generation in the multimode regime, multimodesoliton interactions and photonic quantum gates, and manipulation of theevanescent-field-induced optical trapping potentials of atoms andnanoparticles.

Multimode optically adiabatic silica glass submicron taper