We demonstrate a concentration scheme based on a reversed tracing concept utilizing a conventional sidelit backlighting configuration. The optical arrangement consists of a groove sheet and a wedge plate without any coating or surface treatment. The proposed layout simultaneously exhibits two main features: coupling the collimated solar radiance into a wedge plate and guiding the flux to the exit plane of the wedge plate for use in direct daylight. The measurement revealed an optical efficiency of 52% in conjunction with an inverse aspect ratio of 9.51. In addition to the two-dimensional sidelit scheme, the proposed structure can also be rotationally convolved and extended to a three-dimensional solar concentrator with a high concentration ratio, which will certainly have an impact on solar energy and other optical functions because of its simplicity and versatility.
© 2009 Optical Society of America
Optical Design and Fabrication
Original Manuscript: March 26, 2009
Revised Manuscript: June 20, 2009
Manuscript Accepted: June 26, 2009
Published: July 14, 2009
Ming-Chin Chien, Yu Lung Tung, and Chung-Hao Tien, "Ultracompact backlight-reversed concentration optics," Appl. Opt. 48, 4142-4148 (2009)