Photonic crystal groove waveguide structure capable of generating slow light of broadband

Abstract

The invention provides a photonic crystal groove waveguide structure capable of generating slow light of a broadband. According to the photonic crystal groove waveguide structure, a photonic crystal structure is a triangular lattice structure with the lattice constant being a and the air hole radius being r; and a middle row of air holes are removed to form photonic crystal waveguide with a W1 structure, and air grooves with width w of 0.3a is placed at a defect centre, thereby forming a photonic crystal waveguide groove. According to the photonic crystal groove waveguide structure, the lattice constant in the waveguide direction is increased to 1.06a, thus forming photonic crystal groove waveguide with an italic structure; and a first row of air holes close to the air grooves are moved by 0.05a in the direction far from the air grooves, and a second row of air holes close to the air grooves are moved by 0.13a in the direction far from the air grooves. As a simulating result shown, the broadband with the slow light reaches 2.85nm under group velocity c / 100 by virtue of the photonic crystal groove waveguide structure provided by the invention.

Description

technical field [0001] The invention relates to a photonic crystal groove waveguide structure capable of producing broadband slow light, and belongs to the technical field of micro-optoelectronic device design. Background technique [0002] In recent years, photonic crystals and their devices with dimensions on the order of the wavelength of light have been extensively studied. Among them, the slow light generation technology based on photonic crystal waveguide has attracted widespread attention. Compared with the traditional slow light generation method, the photonic crystal slow light waveguide has a smaller device volume, can generate slow light of any wavelength at room temperature, and has the advantages of controllable slow light characteristics (document 1.T.Baba "Slow light in photonic crystals." Nature Photonics, 2008, 2(8): 465-473.). At present, photonic crystals are mostly processed on silicon-on-insulator (SOI) materials, which are compatible with current main...

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Problems solved by technology

However, it is difficult to precisely control the hole shape and size of photonic crystals (document 6.J.Li, T.P. White, L. O'Faolain, A.Gomez-Iglesias, T.F.Krauss. "Systematic design of flat band slow light in photonic crystal waveguides." Optical Express, 2008, 16 (9): 6227-6232.), although the above two methods have improved the slow light characteristics of the photonic crystal groove waveguide to a certain extent, but increased the complexity of the preparation

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