Scientists from the University of Southampton, in collaboration¹ with the Universities of Sheffield and Crete, have developed a new hybrid² energy transfer system, which mimics⁴ the processes responsible for photosynthesis⁵（光合作用）. From photosynthesis to respiration⁶, the processes of light absorption and its transfer into energy represent elementary and essential reactions that occur in any biological living system.

 

This energy transfer is known as Forster Resonance⁷ Energy Transfer (FRET⁸), a radiationless transmission of energy that occurs on the nanometer scale from a donor⁹ molecule¹⁰ to an acceptor molecule. The donor molecule is the dye or chromophore（发色团） that initially¹¹ absorbs the energy and the acceptor is the chromophore to which the energy is subsequently transferred without any molecular¹² collision. However, FRET is a strongly distance dependent process which occurs over a scale of typically 1 to 10 nm.

 

In a new study, published in the journal Nature Materials, the researchers demonstrate an alternate non-radiative, intermolecular energy transfer that exploits the intermediating role of light confined in an optical cavity. The advantage of this new technique which exploits the formation of quantum states admixture of light and matter, is the length over which the interaction takes places, that is in fact, considerably¹³ longer than conventional FRET-type processes.

 

Co-author Dr Niccolo Somaschi, from the University of Southampton's Hybrid Photonics group (which is led by Professor Pavlos Lagoudakis, co-author of the paper), says: "The possibility to transfer energy over distances comparable to the wavelength¹⁴ of light has the potential to be of both fundamental and applied¹⁵ interest. Our deep understanding of energy transfer elucidates¹⁶ the basic mechanisms¹⁷ behind the process of photosynthesis in biological systems and therefore gets us closer to the reproduction of fully¹⁸ synthetic¹⁹ systems which mimic³ biological functionalities. At the fundamental level, the present work suggests that the coherent（连贯的） coupling of molecules²⁰ may be directly involved in the energy transfer process which occurs in the photosynthesis.

 

"On the applied perspective instead, organic semiconductors²¹ continue to receive significant interest for application in optoelectronic devices, for example light-emitting or photovoltaic devices, in which performance is dependent on our ability to control the formation and transport of carriers in molecular systems."

 

The new device consists of an optical cavity made by two metallic²² mirrors which trap the photons in a confined environment where two different organic molecules reside in. By engineering the spacing between the mirrors based on the optical properties of the organic materials, it is possible to create a new quantum state that is a combination of the trapped photons and the excited states in the molecules. The photon essentially²³ "glues" together these quantum mechanical states, forming a new half-light half-matter particle, called polariton, which is responsible for the efficient transfer of energy from one material to the other.

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