Resonance energy transfer
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Resonance energy transfer (RET) is a process which occurs when the emission of a fluorophore, called the donor, overlaps with the spectrum of another molecule, called the acceptor. It is important to note that the acceptor does not need to be fluorescent. RET does not involve emission of light by the donor, it is not the result of emission from the donor being absorbed by the acceptor. There is no intermediate photon in RET and the donor and acceptor are coupled by dipole-dipole interactions. As such, this process is unique from Fluorescence resonance energy transfer.
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