It is a spectroscopic process in which one molecule transfers its excitation energy non-radiatively over a distance of 1-10 nm to another molecule [9]. The FRET phenomenon has some critical communication advantages. The first one is a very short timescale of the energy transfer that occurs in nanoseconds. Second, the FRET probability depends on the matching between the emission and absorption spectra of the molecules and decreases with the sixth power of the distance between them. Consequently, FRET can be simultaneously used in different parts of a nano-network, like a wireless spectrum band in a cellular network.
Nano-communication via FRET was already discussed in [10-11] where information theory analysis and simulation results for FRET channels were given. In this paper, we present experimental results of FRET-based communication in nano-networks of antibodies (Immunoglobulin G) labeled with Alexa Fluor (AF) fluorescent dyes.