Abstract：
:Electrical contacts on the top surface of solar cells and light emitting diodes cause shadow losses. The phenomenon of extraordinary optical transmission through arrays of subwavelength holes suggests the possibility of engineering such contacts to reduce the shadow using plasmonics, but resonance effects occur only at specific wavelengths. Here we describe instead a broadband effect of enhanced light transmission through arrays of subwavelength metallic wires, due to the fact that, in the absence of resonances, metal wires asymptotically tend to invisibility in the small size limit regardless of the fraction of the device area taken up by the contacts. The effect occurs for wires more than an order of magnitude thicker than the transparency limit for metal thin films. Finite difference in time domain calculations predict that it is possible to have high cloaking efficiencies in a broadband wavelength range, and we experimentally demonstrate contact shadow losses less than half of the geometric shadow.
journal_name
Sci Repjournal_title
Scientific reportsauthors
San Román E,Vitrey A,Buencuerpo J,Prieto I,Llorens JM,García-Martín A,Alén B,Chaudhuri A,Neumann A,Brueck SR,Ripalda JMdoi
10.1038/srep28669subject
Has Abstractpub_date
2016-06-24 00:00:00pages
28669issn
2045-2322pii
srep28669journal_volume
6pub_type
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