Sub-wavelength dielectric-loaded surface plasma optical waveguide

Abstract

The invention discloses a dielectric-loaded surface plasma optical waveguide with a sub-wavelength optical field limit capacity. The cross section of the waveguide structure comprises a dielectric basement layer (1), a metal area (2), a low-refractive-index dielectric area (3), a high-refractive-index dielectric area (4) and a cladding (5), wherein the metal area (2) is positioned on the basementlayer, the low-refractive-index dielectric area (3) is used for cladding the metal area, and the high-refractive-index dielectric area is used for cladding the metal area and the low-refractive-indexdielectric area. As the high-refractive-index dielectric area exists, the distribution range of optical fields of the waveguide structure can be significantly shrunk, and the two-dimension sub-wavelength restriction for transmission optical fields is realized. Meanwhile, as the low-refractive-index dielectric area exists, the waveguide still can keep lower transmission loss. The optical waveguidegreatly realizes the balance between the optical field limit capacity and the transmission loss and provides probability for the realization of an optical waveguide chip with an ultrahigh integrated level.

Description

technical field [0001] The invention relates to the field of optical waveguide technology, in particular to a subwavelength medium-loaded surface plasmon optical waveguide. Background technique [0002] In recent years, surface plasmon photonics technology has shown great application potential in the field of nanophotonics due to its unique advantages. A surface plasmon is a pattern of electromagnetic waves caused by the interaction of light and free electrons on the surface of a metal. This mode exists near the metal-dielectric interface, and its field strength reaches its maximum at the interface, and decays exponentially on both sides of the interface along the direction perpendicular to the interface. Surface plasmons have strong field confinement properties, which can confine the field energy to a region whose spatial size is much smaller than its free-space transmission wavelength, and its properties can change with the change of the metal surface structure. In the s...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of large mode field area and poor confinement ability of the medium-loaded surface plasmon optical waveguide based on low refractive index materials, and propose a medium with subwavelength mode field confinement capability and lower transmission loss Loaded Surface Plasmon Optical Waveguide Structure

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