Experimental and Theoretical NANOTECHNOLOGY (ETN) abbreviated as Exp. Theo. NANOTECHNOLOGY is a multidisciplinary peer-reviewed and open access journal. It includes specialized research papers, short communications, reviews and selected conference papers in special issues on the characterization, synthesis, processing, structure and properties of different principles and applications of nanotechnology with focus on advantageous achievements and applications for the specialists in engineering, chemistry, physics, materials science and medicine. ETN covers and publishes all aspects of fundamental and applied researches of experimental and theoretical nanoscale technology dealing with materials synthesis, processing, nanofabrication, nanoprobes, spectroscopy, properties, biological systems, nanostructures, nanoelectronics, nano-optics, nano-mechanics, nanodevices, nanobiotechnology, nanomedicine, nanotoxicology within the scope of the journal. ETN aims to acquire the recent and outstanding researches for the benefit of the human being.
The radiation efﬁciency of nano-antennas is a key parameter in the emerging ﬁeld of IR and optical energy harvesting. This parameter is the ﬁrst factor in the total efﬁciency product by which nano-antennas are able to convert incident light into useful energy. This efﬁciency is investigatedintermsofthemetalusedasconductorandthedimensionsofthenano-antenna. Theresultssetupperboundsforanypossibleprocesstransforminglightintoelectricalenergy. These upper bounds are the equivalent of the theoretical upper bounds for the efﬁciency of conventionalsolarcells.Silvershowsthehighestefﬁciencies,bothinfreespaceandontopofa glass (SiO2) substrate, with radiation efﬁciencies near or slightly above 90%, and a total solar powerharvestingefﬁciencyofabout60–70%.Thisisconsiderablyhigherthanconventionalsolar cells.Itisfoundthatﬁne-tuningofthedipoledimensionsiscrucialtooptimizetheefﬁciency. & 2012 Elsevier Ltd. All rightsreserved.
Keywords:Harvesting; Energy; Solar; Nano-antenna.