The National Science Foundation (NSF) is offering a federal grant opportunity titled "Biophotonics," aimed at advancing research in photonics principles and technology relevant to critical challenges in medicine, biology, and biotechnology. The program seeks innovative proposals that explore areas such as deep tissue imaging, novel macromolecule labeling methods, and the development of biocompatible photonic tools, with a focus on low-cost and minimally invasive medical diagnostics and therapies. Proposals can be submitted at any time, with a typical award duration of up to three years, and interested applicants are encouraged to contact the program director for guidance prior to submission. For further details, applicants can reach out to NSF grants.gov support at grantsgovsupport@nsf.gov or visit the program's additional information page at http://www.nsf.gov/funding/pgm_summ.jsp?pims_id=506130.