COMSOL modeling.mph

COMSOL model for the initiation of fiber fus

Guided mode meta-optics: Metasurface-dressed nanophotonic waveguides for arbitrary designer mode couplers and on-chip OAM emitters with configurable topological charge

Metasurfaces have achieved fruitful results in tailoring complexing light fields in free space. However, a systematic investigation on applying the concept of meta-optics to completely control waveguide modes is still elusive. Here we present a comprehensive catalog capable of selectively and exclusively excite almost arbitrary high-order waveguide modes of interest, leveraging silicon metasurface-patterned silicon nitride waveguides. By simultaneously engineering the phase-matched gradient of the metasurface and the vectorial spatial modal overlap between the nanoantenna near-field and target waveguide mode for excitation, either single or multiple high-order modes are successfully launched with high purity reaching 98% and broad bandwidth. Moreover, on-chip twisted light generators are also theoretically demonstrated with configurable OAM topological charge \ell from -3 to +2, serving as a comprehensive framework for metasurface-enabled guided mode optics and motivating further applications such as versatile integrated couplers, demultiplexers, and mode-division multiplexing-based communication systems

Supplementary document for Guided mode meta-optics: Metasurface-dressed waveguides for arbitrary mode couplers and on-chip OAM emitters with configurable topological charge - 5532418.pdf

Details in device simulation,OAM modes purity calculation and structure parameter

Supplementary document for Broadband nanostructured fiber mode convertors enabled by inverse design - 5822149.pdf

The radii data of all the structures

Supplementary document for Spectral pedestal during kilowatt-level amplification of random fiber laser operating near lasing threshold - 5570705.pdf

Detailed properties of individual random seed and fixed-cavity see