We have investigated light beaming through a single slit in a silver thin film with periodic gratings on the output side in the mid-infrared wavelength range. We show that light beaming in mid-infrared is mainly controlled by spoof surface plasmons. We take account of both the dispersion relation and the phase-matching condition of spoof surface plasmons to obtain good beaming efficiency. Through engineering the geometrical parameters of the grating structures, we can achieve the desired near-field and far-field distribution in mid-infrared.
© 2010 Optical Society of America
Optics at Surfaces
Original Manuscript: December 4, 2009
Revised Manuscript: January 12, 2010
Manuscript Accepted: January 26, 2010
Published: March 15, 2010
Pengyu Chen, Qiaoqiang Gan, Filbert J. Bartoli, and Lin Zhu, "Spoof-surface-plasmon assisted light beaming in mid-infrared," J. Opt. Soc. Am. B 27, 685-689 (2010)