title: High gain, wide field of view concentrator for optical communications.
abstract: The field of view and gain of optical concentrators used within free space optical communications systems are constrained by conservation of etendue. In this Letter, consideration of the processes in a fluorescent concentrator leads to a simple design strategy for these concentrators for this application. Significantly, because fluorescent concentrators do not conserve etendue, this can lead to concentrators with wider fields of view and higher gains. A model of a fluorescent concentrator containing a quantum dot material suggests that it could have a gain 50 times higher than an etendue conserving concentrator with the same field of view.
authors.forename: Steve
authors.initials: S
authors.lastname: Collins
authors.forename: Dominic C
authors.initials: DC
authors.lastname: O'Brien
authors.forename: Andrew
authors.initials: A
authors.lastname: Watt