Efficiently achieving platform nonspecific designs with multiple functional requirements, such as arbitrary splitting ratio, low insertion losses, broad bandwidth, and small footprint, poses a significant challenge in the inverse design of optical Splitters. Traditional designs often fall short in meeting all the necessary criteria, while more successful nanophotonic inverse designs often demand substantial time and energy resources per device. Here, we present an efficient inverse design algorithm which provides universal designs of Splitters compliant with all the above constraints and offers significantly greater throughput compared to nanophotonic inverse design. To demonstrate the effectiveness of our method, we designed Splitters with various splitting ratios and fabricated 1×N power Splitters using direct laser writing in a borosilicate platform, which shows zero loss within marginal error, competitive imbalance of < 0.5 dB and a broad bandwidth range of 20 − 60 nm around 640 nm. Notably, our designs can be easily tuned to achieve different splitting ratios. Furthermore, we discussed the scalability of the Splitter footprint.
The induction of synthetic magnetic fluxes allows to effectively control the localization and transport properties on a given lattice structure. In this work, we generate an effective magnetic flux where fundamental and first excited modes effectively interact. We implement a z-scan method on femtosecond laser written photonic lattices and experimentally observe Aharonov-Bohm caging, for both modes independently. We demonstrate a controlled dynamics where we perfectly translate the light across the lattice.
We suggest a simple and effective method for controlling the multi-port switching of discrete solitons in arrays of nonlinear optical waveguides. We demonstrate the digitized switching of a narrow input beam in both cubic and quadratic nonlinear waveguide arrays.
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