Dual-mirror aplanats provide efficient, ultracompact, high-irradiance solar concentration and were recently developed for concentrator photovoltaics. However, inherent limitations place the focus inside the optic. This mandates a terminal dielectric concentrator to extract concentrated sunlight to the solar cell outside the optic, and an optical bond to the cell. Can a modified design strategy site the focus outside the optic (eliminating the need for an extractor and optical bond) without compromising concentrator compactness, low shading losses, or pragmatic manufacturability? We show how judiciously nested dual-mirror aplanats can satisfy all these objectives, with raytrace simulations confirming performance tantamount to the best conventional aplanats.
© 2011 Optical Society of America
Optical Design and Fabrication
Original Manuscript: May 31, 2011
Revised Manuscript: June 26, 2011
Manuscript Accepted: June 26, 2011
Published: July 21, 2011
Alex Goldstein, Daniel Feuermann, Gary D. Conley, and Jeffrey M. Gordon, "Nested aplanats for practical maximum-performance solar concentration," Opt. Lett. 36, 2836-2838 (2011)