A semi-analytical model for the optical properties of silicon nanowires (SiNWs) is presented. Results from the model offer a good physical understanding of the optical behavior of SiNWs. It is shown that light trapping within ordered nanowires only happens over a small wavelength band (20–75 nm) that is dependent on the diameter of the nanowires, not length. Furthermore, wavelength tunable absorption peaks can be achieved in ordered SiNWs by adjusting the geometrical parameters. A good match between the model and experimental results confirms the validity of the proposed effective index model.
© 2013 Optical Society of America
Original Manuscript: August 6, 2012
Revised Manuscript: December 1, 2012
Manuscript Accepted: December 2, 2012
Published: January 9, 2013
Susan Patchett, Mohammadreza Khorasaninejad, Nixon O, and Simarjeet S. Saini, "Effective index approximation for ordered silicon nanowire arrays," J. Opt. Soc. Am. B 30, 306-313 (2013)