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We theoretically discuss how to tune the competition between Forster transferand spontaneous emission in a continuous and nondestructive fashion. Theproposed approach is especially suitable for delicate biological systems likelight harvesting complexes and fluorescent protein oligomers. We demonstratethat the manipulation of the density of photonic states at the emissionfrequency of the energy donor results in a change of the quantum efficienciesof the competing energy transfer and spontaneous emission processes. Thischange will be manifested in a modification of the donor and acceptor emissionintensities. Thus, by controlling the local density of photonic states Forstercoupled systems can be manipulated and analyzed without the need to physicallyseparate donor and acceptor chromophores for individual analysis, which is ofinterest, for example, for oligomeric reef coral fluorescent proteins.

Tuning Spontaneous Emission versus Forster Energy Transfer in Biological Systems by Manipulating the Density of Photonic States