<p><span style=color: rgba(23 43 77 1)>This reprint focuses on the latest developments and trends in the theory design fabrication and application/validation of photonic sensors. Photonic sensors have attracted widespread interest in countless domains including aerospace food processing high-energy physics experiments environmental monitoring medicine the nuclear industry oil and gas railways and structural health monitoring. They convey several advantages in these scenarios such as their high-sensitivity and -resolution measurements small size and weight immunity to electromagnetic interference resistance to harsh environments long-distance monitoring and high multiplexing capability.</span></p>