We demonstrate an experimental method for the direct measurement of band structures of one-dimensional periodic optical media. With the help of a prism coupler that is used in a retroreflective scheme, the allowed bands of a waveguide array in lithium niobate are determined and the results are compared with numerical calculations. Furthermore, we demonstrate the suitability of this method to measure propagation constants of extended nonlinear modes inside the forbidden gap.
© 2006 Optical Society of America
Original Manuscript: May 10, 2006
Manuscript Accepted: June 29, 2006
Published: August 25, 2006
Christian E. Rüter, J. Wisniewski, and Detlef Kip, "Prism coupling method to excite and analyze Floquet-Bloch modes in linear and nonlinear waveguide arrays," Opt. Lett. 31, 2768-2770 (2006)