Using SOI and silicon‑nitride platforms, we develop photonic integrated circuits and devices—microrings, slot waveguides, interferometers—with engineered dispersion, low loss, and robust packaging. Activities cover device/circuit co‑design with analog/digital readout, calibration and verification, and system‑level signal acquisition/processing to achieve meaningful limits of detection, fast response times, and cost‑effective, CMOS‑compatible manufacturing.