A new efficient plasmonic structure for solar energy absorption is designed. Numerical simulations demonstrate the absorption enhancement in a symmetrical structure based on the mode coupling between the localized plasmonic mode in an Ag strip pair and the excited waveguide mode in a silicon slab. Then the method of symmetry breaking is used to excite the dark modes that can further enhance the absorption ability. The new structure is compared with a bare thin-film Si solar cell, and results show that the integrated light harvest efficiency is greatly improved for the TM polarization in such thin geometry.
© 2011 Optical Society of America
Optics at Surfaces
Original Manuscript: January 25, 2011
Revised Manuscript: May 29, 2011
Manuscript Accepted: June 7, 2011
Published: July 5, 2011
Tong Li, Lei Dai, and Chun Jiang, "Design of efficient plasmonic thin-film solar cells based on mode splitting," J. Opt. Soc. Am. B 28, 1793-1797 (2011)