The excitation of single and multiple-frequency surface plasmon polaritons (SPP) by a metallic groove grating is studied in the terahertz (THz) frequency range. The efficiency of such gratings for the excitation of SPPs is explored with respect to the grating profile. Numerical simulations provide information on how to design such gratings. Groove gratings were fabricated by anisotropic etching of semiconductor surfaces. Reflection and SPP excitation measurements were done using THz time-domain spectroscopy. The results demonstrate the potential of multisection groove gratings for efficient excitation of broadband THz SPPs.
© 2009 Optical Society of America
Optics at Surfaces
Original Manuscript: September 12, 2008
Manuscript Accepted: December 12, 2008
Published: February 27, 2009
Michael Martl, Juraj Darmo, Karl Unterrainer, and Erich Gornik, "Excitation of terahertz surface plasmon polaritons on etched groove gratings," J. Opt. Soc. Am. B 26, 554-558 (2009)