Photonic sensors are the most promising and rapidly advancing areas of photonics today, with applications in healthcare, environmental monitoring, and industrial applications. This new book provides an overview of a wide range of new and innovative technologies and current applications of photonic sensors for biomedical applications. Beginning with an overview of basic elements that make up the photonic sensors, the authors lay out the principles of light-matter interaction to the complexities surrounding optical waveguides and then delve into the richest part of the field of sensors: biosensors that are made for detecting and measuring certain biochemical substances. The book covers biosensors, surface plasmon resonance sensors, one- and two-dimensional photonic crystals for sensing and detection applications, muscle strength monitoring using optical sensors, AI in photonics, versatile fiber Bragg gratings sensors, highly sensitive surface plasmon resonance sensors, etc. The exciting realm of MEMS optical sensors that illustrate the union of miniaturization and photonics in sensing technology is also covered, along with case studies. The authors also take us through using artificial intelligence with photonics sensors that help improve data analysis, pattern recognition, and decision-making.