Medium slit optical waveguide

Abstract

The invention discloses a medium slit optical waveguide. The cross section of the waveguide structure comprises a substrate layer (1), a high-refractive index buffer layer (2), a high-refractive index medium layer (3), a low-refractive index medium layer (4), a high-refractive index medium area (5), a low-refractive index medium area (6), a high-refractive index medium area (7) and a wrapping layer (8), wherein the high-refractive index buffer layer (2), the high-refractive index medium layer (3) and the low-refractive index medium layer (4) are sequentially arranged from bottom to top on thesubstrate layer; and the high-refractive index medium area (5), the low-refractive index medium area (6) and the high-refractive index medium area (7) are sequentially arranged from left to right on the low-refractive index medium layer. The waveguide can realize relatively strong mode field restriction on two polarized lights at the same time, and can realize multiple characteristics such as positive and negative birefringence, zero birefringence and the like through regulation and control on the structure size. The medium slit waveguide is matched with the existing silicon substrate processing technology and can be used for realizing multiple photon devices.

Description

technical field [0001] The invention relates to the field of optical waveguide technology, in particular to a dielectric slit optical waveguide. Background technique [0002] Traditional dielectric optical waveguides usually use high-refractive-index materials as waveguide cores, and low-refractive-index materials as cladding layers. The light field is mainly transmitted in the waveguide core made of high-refractive index materials. Due to the diffraction limit, its size tends to be relatively large. The dielectric slit optical waveguide first proposed in 2004 can realize the transmission of optical signals in nanometer-sized low-refractive index media, breaking through the size limitation of traditional optical waveguides. This type of waveguide is composed of adjacent high-refractive-index medium regions, and the middle of the high-refractive-index medium region is a low-refractive-index medium region. Its working principle is to use the discontinuity of the electric fie...

AI Technical Summary

Problems solved by technology

There are two main types of traditional dielectric slot waveguides, horizontal slot waveguides and vertical slot waveguides, both of which can only constrain the strong mode field of one polarized light (TE polarization or TM polarization). The other polarization (TM polarization or TE polarization) tends to be less confinement

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