title: Planar concentrators near the étendue limit.
abstract: Recently proposed aplanatic imaging designs are integrally combined with nonimaging flux boosters to produce an ultracompact planar glass-filled concentrator that performs near the étendue limit. Such optical devices are attractive for high-efficiency multijunction photovoltaics at high flux, with realistic power generation of 1 W from a 1 mm2 cell. When deployed in reverse, our designs provide collimation even for high-numerical-aperture light sources.
authors.affiliation: School of Natural Sciences and School of Engineering, University of California, Merced, Merced, California 95344, USA. rwinston@ucmerced.edu
authors.forename: Roland
authors.initials: R
authors.lastname: Winston
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Gordon