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低维和介观物理系统的研究是凝聚态物理学中的重要研究方向,我们以二维三角晶格介质柱型光子晶体为研究对象,利用时域有限差分的方法,分析了其介观温光效应的影响:由于温度改变导致晶体介质的折射率和厚度发生变化,继而对光子禁带产生影响.结果表明:当晶体所处环境温度升高时,光子禁带发生整体平移(波长大的方向),禁带宽度变窄,禁带中心波长与温度变化存在线性关系,引入介观温光系数来描述该线性变化,得到理论数值γ=0.336nm/℃,这为二维光子晶体基光学器件的制备和使用提供了理论参考.
The research of low-dimensional and mesoscopic physical systems is an important research direction in condensed matter physics. Taking the two-dimensional triangular lattice columnar photonic crystals as the research object, we use the finite difference time domain method to analyze the mesoscopic temperature Effects: The refractive index and thickness of the crystal medium change due to temperature changes, which in turn affect the photonic band gap.The results show that when the ambient temperature of the crystal increases, the photonic band gap shifts in the whole direction ), The band gap becomes narrower, and there is a linear relationship between the center wavelength of the band gap and the temperature change. The mesoscopic temperature coefficient of light is introduced to describe the linear change, and the theoretical value γ = 0.336nm / ° C is obtained. This is a two- Provides a theoretical reference for the preparation and use.