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Opt Express. 2010 Aug 2;18(16):16646-62. doi: 10.1364/OE.18.016646.

Cylinder light concentrator and absorber: theoretical description.

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  • 1Birck Nanotechnology Center, School of Electrical Engineering, Purdue University, West Lafayette, IN 47903 USA.


We present a detailed theoretical description of a broadband omnidirectional light concentrator and absorber with cylinder geometry. The proposed optical "trap" captures nearly all the incident light within its geometric cross-section, leading to a broad range of possible applications--from solar energy harvesting to thermal light emitters and optoelectronic components. We have demonstrated that an approximate lamellar black-hole with a moderate number of homogeneous layers, while giving the desired ray-optical performance, can provide absorption efficiencies comparable to those of ideal devices with a smooth gradient in index.

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