Focal plane research refers to the study of the area within an optical system where light converges to form an image. This area is typically located at the focal point of a lens or mirror and is critical to the functioning of various optical instruments such as cameras, telescopes, and microscopes. Researchers in this field may study the design, optimization, and performance of focal planes, as well as the development of new technologies and materials to improve imaging quality and sensitivity. This research area is important in advancing the field of optics and photonics, with applications in fields such as astronomy, biomedical imaging, and remote sensing.