On-chip microscopy is a field of research that focuses on the miniaturization of traditional microscopy techniques onto a single microchip or other compact platform. This technology allows for high-resolution imaging of biological samples, without the need for bulky and expensive equipment. On-chip microscopy offers several advantages, such as portability, ease of use, and potential for integration with other lab-on-chip technologies. Researchers in this field are working to improve the resolution, speed, and sensitivity of these miniaturized imaging devices for various applications in biology, medicine, and environmental monitoring.