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在对称的均匀电介质材料光子晶体体系中插入另一折射率渐变的光子晶体可构成光量子阱结构.利用时域有限差分法计算了不同折射率分布光量子阱结构的传输谱.研究表明:束缚态是对处于垒光子晶体禁带中的阱光子晶体导通带的离散化,束缚态能级个数等于阱光子晶体结构单元的重复周期数;以渐变方式调整阱区折射率分布,可在特定频率范围内得到新的互不交叠的束缚态.这样在有限的禁带区域可以成倍增加光子束缚态而无需增大光量子阱结构的尺寸,使信道密度最大化、光波有效带宽的使用最优化.这种量子阱结构可用于制作超窄带滤波器和多通道窄带滤波器,有望在光通信超密集波分复用和光学精密测量技术中获得广泛应用.
Photonic crystals with a gradual change of refractive index can be formed by inserting a photonic crystal with a gradual refractive index in a symmetrical homogeneous photonic crystal material system. The transmission spectra of photonic quantum wells with different refractive index distributions are calculated by the finite difference time-domain method. The results show that the bound state is Discretization of the conduction band of the well photonic crystal in the forbidden band of the barrier photonic crystal is equal to the number of the repeating state of the trap photonic crystal structure unit. Adjusting the refractive index distribution of the well in a gradient manner can be performed at a specific frequency So that a new non-overlapped bound state can be obtained within a limited band-gap region, which can exponentially increase the photon-bound state without increasing the size of the photonic quantum well structure to maximize the channel density and optimize the use of the effective bandwidth of light waves This quantum well structure can be used to fabricate ultra-narrowband filters and multi-channel narrowband filters, and is expected to find wide application in optical communications for ultra-dense wavelength division multiplexing and optical precision measurement.