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An ultra-narrowband all-optical filter based on the resonant cavities in rod-based photonic crystal microstructure

机译：基于棒的光子晶体微观结构中的谐振腔的超窄带全滤器

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摘要

In view of the large scientific and technical interest in the frequency-selective all-optical devices, and some optical filters limitations, we focus on the design and analysis of a novel ultra-narrowband all-optical filter. The proposed structure consists of input/output waveguides and a resonator in a microstructured photonic crystal that encompasses silicon rods. We study the effects of the variations of rod radius, the lattice constant, and the refractive index of the filter on the resonance wavelength, quality factor, transmission, and full width at half maximum (FWHM) by solving Maxwell's equations using the finite-difference time-domain method. The numerical results show that the proposed filter with a lattice constant of a = 540 nm, central resonant rod radius of 216 nm, and the rod radius of r = 0.2a has a resonant wavelength of λ_r= 1253 nm, the quality factor of Q_f= 3288, FWHM of 0.26 nm and broad free spectral range of FSR = 790 nm while this filter for r=0.26a has λ_r= 1552 nm, Q_f = 5542, FWHM of 0.28 nm, and FSR = 720 nm. Some promising characteristics, such as its short propagation time and a small area of 102.6 μm~2 make this optical filter an interesting candidate for use in photonic integrated chips.
机译：鉴于频率选择性的全光器件和一些光学过滤器限制的大型科学和技术兴趣，我们专注于新型超窄带全滤器的设计和分析。所提出的结构包括输入/​​输出波导和谐振器，其包括硅棒的微结构化光子晶体。我们通过使用有限差异解决Maxwell的方程，研究杆半径，晶格常数，滤光片常数和滤波器的折射率和滤波器折射率和滤波器折射率和半宽度（fwhm）的效果。时域方法。数值结果表明，所提出的过滤器具有达540nm的晶格常数，中央谐振杆半径为216nm，r = 0.2a的杆半径具有λ_r= 1253nm的谐振波长，q_f的质量因子= 3288，FSR = 790nm的0.26nm和宽自由谱范围的FSR = 790nm的FSR = 0.26a的滤波器具有λ_r= 1552nm，q_f = 5542，fwhm为0.28nm，fsr = 720nm。一些有希望的特性，例如其短传播时间和102.6μm〜2的小面积使得该光学滤波器是用于光子集成芯片的有趣候选者。

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