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.

中文翻译：

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基于棒基光子晶体微结构谐振腔的超窄带全光滤波器

鉴于对频率选择全光器件的巨大科学和技术兴趣，以及一些滤光器的局限性，我们专注于一种新型超窄带全光滤光器的设计和分析。所提出的结构由输入/输出波导和包含硅棒的微结构光子晶体中的谐振器组成。我们通过使用有限差分求解麦克斯韦方程来研究棒半径、晶格常数和滤波器折射率的变化对谐振波长、品质因数、透射率和半峰全宽 (FWHM) 的影响时域法。数值结果表明，所提出的滤波器的晶格常数为 a = 540 nm，中心谐振棒半径为 216 nm，棒半径为 r = 0。2a 具有 λ r = 1253 nm 的谐振波长，Q f = 3288 的品质因数，0.26 nm 的 FWHM 和 FSR = 790 nm 的宽自由光谱范围，而 r = 0.26a 的此滤波器具有 λ r = 1552 nm， Q f = 5542，FWHM 为 0.28 nm，FSR = 720 nm。一些有前途的特性，例如其传播时间短和 102.6 µm 2 的小面积，使该滤光器成为用于光子集成芯片的有趣候选者。