Reactive self-tracking solar concentrators: concept, design, and initial materials characterization

Étendue limits angular acceptance of high-concentration photovoltaic systems and imposes precise two-axis mechanical tracking. We show how a planar micro-optic solar concentrator incorporating a waveguide cladding with a nonlinear optical response to sunlight can reduce mechanical tracking requirements. Optical system designs quantify the required response: a large, slow and localized increase in index of refraction. We describe one candidate materials system: a suspension of high index particles in a low index fluid combined with a localized space-charge field to increase particle density and average index. Preliminary experiments demonstrate an index change of aqueous polystyrene nanoparticles in response to a low voltage signal and imply larger responses with optimized nanofluidic materials.


Published in:
Applied Optics, 51, 8, 1086-1094
Year:
2012
Publisher:
Optical Society of America
ISSN:
0003-6935
Keywords:
Laboratories:




 Record created 2011-12-22, last modified 2018-03-17


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