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Emerging applications in wide-range optical fields require a common building block cell for dense photonic integrated circuits with high performance and multi-functionality. We present a flexible grating-assisted silicon microring resonator structure promising of generating several physical effects including slow light effect, Vernier effect and orbital angular momentum emitting for different scenarios. By presenting the design, optimization principle, and assessing the performances, we demonstrate that the device could achieve different purposes with the same design routine and fabrication process with slight changes of the geometry parameters, which is very attractive for the realization of versatile building block element.

Real-time and high-sensitivity biosensors are urgently needed in biochemistry. As one of the candidates, silicon-on-insulator (SOI) sensors exhibits excellent performances. However, there are still some limitations to hinder them to be applied to much wider scenarios. Fabrication tolerance is also required for the generalization of these micro- or nano-structure. In this work, we demonstrate an SOI waveguide biosensor for biochemical sensing with high sensitivity of 1.88 × 105 dB/RIU. Because of the compact structure and low demand for accuracy of fabrication, this device possesses better applicability and reliability.