Optimizing method for slow light characteristic based on liquid filled photonic crystal groove waveguide

Abstract

The invention provides an optimizing method for a slow light characteristic based on liquid filled photonic crystal groove waveguide. By filling liquid with refractive indexes as 1.416 and 1.645 respectively in air holes of a first row and a second row closest to the photonic crystal groove waveguide, optimization can be conducted on the slow light characteristic of the photonic crystal groove waveguide. Simulation results show that when a group index of refraction is 150, a slow light bandwidth can reach 1.35 nm, and group velocity dispersion can be reduced to 5x10-6 ps2 / km. When working temperature change of the photonic crystal groove waveguide or air hole radius manufacture errors affect the slow light characteristic, the slow light characteristic of the photonic crystal groove waveguide can be stabilized by adjusting the refractive index of filling liquid.

Description

technical field [0001] The invention relates to a method for optimizing the slow light characteristics of a photonic crystal slot waveguide based on liquid filling, and belongs to the technical field of micro-optoelectronic device design. Background technique [0002] The slow light effect is a new concept proposed in 1999, which refers to the phenomenon that the propagation speed of the light pulse is much smaller than the speed of light. Because slow light can realize the processing of optical signals in the time domain and the localization of light energy in space, it has gradually become a research hotspot in the field of optics (document 1. T. F. Krauss. "Why do we need slow light." Nature Photonics, 2008, 2(8): 448-450.). Compared with the traditional slow light generation method, the photonic crystal waveguide can control the motion state of photons due to its unique photonic bandgap characteristics, and can generate slow light at room temperature, and can achieve sl...

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Problems solved by technology

However, it is difficult to precisely control the hole shape and size of photonic crystals (document 7. 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; Literature 8. W. W. Song, R. A. Integlia, W. Jiang. “Slow light loss due to roughness in photonic crystal waveguides: An analytic approach.” Physical Review B , 2010, 82(3): 235306.), although the above two methods improved the slow-light characteristics of the photonic crystal slot waveguide to a certain extent, but increased the complexity of the photonic crystal slot waveguide preparation

Moreover, in practical applications, the slow light characteristics of the photonic crystal slot waveguide will inevitably be affected by the ambient temperature and the preparation error of the air hole radius of the photonic crystal slot waveguide, which will seriously limit the application range of the photonic crystal slot waveguide slow light

J. Wu et al. (Document 9. J. Wu, Y. P. Li, C. Peng, Z. Y. Wang. "Numerical demonstration of slow light tuning in slotted photonic crystal waveguide using microfluidic infiltration." Optics Communications, 2011, 284(8): 2149-2152.) In 2011, it was proposed to fill the air slots of the photonic crystal slot waveguide with liquids of different refractive indices, which realized the tuning of the working wavelength of slow light, but its slow light characteristics have not been improved.

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