ArticleNanophotonics (Berlin, Germany)2026
Inverse-Designed Silicon Nitride Bimodal Mode Converter for Interferometric Sensors.
Article in Nanophotonics (Berlin, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
High fringe visibility is essential for achieving high sensitivity and low detection limits in bimodal interferometric sensors, as it depends critically on balanced optical power between the interfering modes. Compact bimodal mode converters (BiMCs) that enable precise modal power control are therefore key components for integrated interferometric biosensors. However, conventional approaches based on shifted junctions or periodic waveguide structures often lack flexibility and exhibit limited efficiency, particularly for higher-order mode excitation. Here, we experimentally demonstrate compact inverse-designed BiMCs on silicon nitride (SiN) capable of exciting multiple supported mode pairs within footprints as small as 224 μm
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