NDLI: Modes of Subwavelength Plasmonic Slot Waveguides

Content Provider	IEEE Xplore Digital Library
Author	Veronis, G. Shanhui Fan
Copyright Year	1983
Abstract	We investigate the properties of the modes that are supported by 3-D subwavelength plasmonic slot waveguides. We first show that the fundamental mode that is supported by a symmetric plasmonic slot waveguide, which is composed of a subwavelength slot in a thin metallic film embedded in an infinite homogeneous dielectric, is always a bound mode for any combination of operating wavelength and waveguide parameters. Its modal fields are highly confined over a wavelength range extending from zero frequency to the ultraviolet. We then show that for an asymmetric plasmonic slot waveguide, in which the surrounding dielectric media above and below the metal film are different, there may exist a cutoff slot width and/or a cutoff metal film thickness above which the mode becomes leaky, and there always exists a cutoff wavelength above which the mode becomes leaky. We investigate in detail the effect of variations of the parameters of the symmetric and asymmetric plasmonic slot waveguides. We also consider related alternative 3-D plasmonic waveguide geometries, such as a plasmonic slot waveguide, in which the two metal film regions that form the slot have a finite width, and a plasmonic strip waveguide, which is formed between a metallic strip and a metallic substrate. We show that for a specific modal size, the fundamental mode of the standard plasmonic slot waveguide has a larger propagation length compared with the corresponding modes of these plasmonic waveguides.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	2511
Ending Page	2521
Page Count	11
File Size	685535
File Format	PDF
ISSN	07338724
Volume Number	25
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasmons Optical waveguides Electromagnetic waveguides Optical films Optical surface waves Dielectric thin films Frequency Electromagnetic propagation Optical propagation Surface waves surface plasmons Integrated optics optical waveguides
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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