Transmission characteristics of a subwavelength metallic slit with perpendicular groove

Li Jin; Jun Zhou; Weibo Zou; Haopeng Zhang; Lingfen Zhang

doi:10.1117/12.904419

29 November 2011 Transmission characteristics of a subwavelength metallic slit with perpendicular groove

Li Jin, Jun Zhou, Weibo Zou, Haopeng Zhang, Lingfen Zhang

Proceedings Volume 8307, Passive Components and Fiber-Based Devices VIII; 830714 (2011) https://doi.org/10.1117/12.904419
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China

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.

Citation Download Citation

Li Jin, Jun Zhou, Weibo Zou, Haopeng Zhang, and Lingfen Zhang "Transmission characteristics of a subwavelength metallic slit with perpendicular groove", Proc. SPIE 8307, Passive Components and Fiber-Based Devices VIII, 830714 (29 November 2011); https://doi.org/10.1117/12.904419

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KEYWORDS

Waveguides

Surface plasmons

Magnetism

Constructive interference

Resonance enhancement

Dielectrics

Finite element methods

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