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This work presents an on-chip optical sensing system based on phase-shifted Bragg grating. The proposed design could be easily fabricated using ion exchange technology. The sensor geometry has been optimized using a finite difference time domain (FDTD) solver to achieve maximum sensitivity and figure of merit (FOM). FOM of 227.63 and a sensitivity of 343.1nm/RIU have been achieved for the water-based sensing system.
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Mulan E. Mohamed, Hesham A. Ahmed, Adel Shaaban, Mohamed A. Swillam, "Integrated optical sensing system on glass substrate," Proc. SPIE 12431, Photonic and Phononic Properties of Engineered Nanostructures XIII, 1243104 (15 March 2023); https://doi.org/10.1117/12.2654714