Abstract
The transmission property of a subwavelength metallic slit with perpendicular groove is investigated by using finite element method. The lengths for the slits at both sides of the groove are set as the length of a metallic slit without groove at the surface plasmon fundamental mode resonance. In the grooved subwavelength metallic slit, enhanced transmission is found to be attributed to two kinds of resonance including surface plasmon waveguide resonance along the propagating direction and the transversely constructive interferential resonance. For the former resonance, integer antinodes of surface plasmon are formed in the groove. For the later resonance, there is a tradeoff between the maximum amplitude and the full width at half maximum of the transmitted peaks with the change of the groove width. And, the transmission enhancement of the grooved subwavelength metallic slit is related to the number of groove and the incident wavelength. Furthermore, the above resonances also exist in the structure whose lengths of metallic slits are set as the length of a slit without groove at the surface plasmon high-order mode resonance. By optimizing the geometric parameters, the transmission enhancement of the grooved subwavelength metallic slit as high as about 15367% is achieved.
© 2011 Optical Society of America
PDF ArticleMore Like This
Guangyuan Li, Fan Lu, Zhen Meng, and Anshi Xu
83080Y Asia Communications and Photonics Conference and Exhibition (ACP) 2011
Semih Cakmakyapan, Humeyra Caglayan, Andriy Serebryannikov, and Ekmel Ozbay
JTuI67 CLEO: Applications and Technology (CLEO:A&T) 2011
Sandeep Inampudi, David Slocum, David C. Adams, S. Vangala, William D. Goodhue, Daniel Wasserman, and Viktor A. Podolskiy
JTuI56 CLEO: Applications and Technology (CLEO:A&T) 2011