在与可重构 GST225 材料耦合的光栅法布里-珀罗腔内,通过克尔非线性纳米its 实现量身定制的光吸收操纵

IF 4.4 2区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Arezou Rashidi
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引用次数: 0

摘要

本文研究了银等离子光栅在电信波长下的吸收可调谐性,该光栅结合了克尔型非线性氧化石墨烯(GO)纳米its 和 Ge2Sb2Te5(GST225)相变材料。线性吸收光谱显示,无定形的 GST225 光栅有两个不同的吸收峰,而半结晶会产生一个明显的吸收峰,全结晶则会产生一个红移峰,吸收值略有下降。这些发现证实,GST225 的结晶度会显著改变其吸收特性。当受到具有适当通量的纳秒高斯脉冲激光照射时,纳米晶内的电场约束会增强,尤其是在脉冲中心,从而导致克尔非线性引起的明显的吸收调整。在波长为 1591.5 nm 的 L 波段上进行的时间检测显示,非晶态和晶体 GST225 都出现了 U 型吸收响应,在脉冲峰值处有明显的下降。在半结晶状态下,微弱的线性吸收在脉冲的前缘和后缘都会大幅增强,在中心处会出现衰减,这说明了 GO 纳米its 中的克尔非线性。不同激光通量下的动态吸收行为凸显了该系统在高对比度光学切换方面的潜力。我们的研究结果为利用非线性克尔效应开发可重构光学开关提供了启示,为可调谐光通信技术的发展铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Toward tailored light absorption manipulation by Kerr nonlinear nanoslits within a grating Fabry-Perot cavity coupled with reconfigurable GST225 material
In this paper, we investigate the absorption tunability of a silver plasmonic grating incorporating Kerr-type nonlinear graphene-oxide (GO) nanoslits and Ge2Sb2Te5 (GST225) phase-change material at telecom wavelengths. The linear absorption spectra reveal that the amorphous GST225 grating exhibits two distinct absorption peaks, while half-crystallization leads to a single pronounced peak, and full crystallization results in a redshifted peak with a slightly decreased value. These findings confirm that the crystalline degree of GST225 significantly modulates the absorption characteristics. Upon exposure to a nanosecond Gaussian pulse laser irradiation with appropriate fluences, the electric field confinement within the nanoslits intensifies, particularly at the center of the pulse, leading to a pronounced absorption adjustment due to Kerr nonlinearity. Temporal examination at the L-band wavelength of 1591.5 nm reveals a U-shaped absorption response for both amorphous and crystalline GST225, with a pronounced dip at the pulse’s peak. In the half-crystallized state, the weak linear absorption can be substantially enhanced at both the leading and trailing edges of the pulse, with a dip at the center, illustrating the Kerr nonlinearity within the GO nanoslits. The dynamic behavior of absorption under different laser fluences underscores the potential of this system for high-contrast optical switching. Our results offer insights into the development of reconfigurable optical switches utilizing nonlinear Kerr effects, paving the way for advancements in tunable optical communication technologies.
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来源期刊
Results in Physics
Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY
CiteScore
8.70
自引率
9.40%
发文量
754
审稿时长
50 days
期刊介绍: Results in Physics is an open access journal offering authors the opportunity to publish in all fundamental and interdisciplinary areas of physics, materials science, and applied physics. Papers of a theoretical, computational, and experimental nature are all welcome. Results in Physics accepts papers that are scientifically sound, technically correct and provide valuable new knowledge to the physics community. Topics such as three-dimensional flow and magnetohydrodynamics are not within the scope of Results in Physics. Results in Physics welcomes three types of papers: 1. Full research papers 2. Microarticles: very short papers, no longer than two pages. They may consist of a single, but well-described piece of information, such as: - Data and/or a plot plus a description - Description of a new method or instrumentation - Negative results - Concept or design study 3. Letters to the Editor: Letters discussing a recent article published in Results in Physics are welcome. These are objective, constructive, or educational critiques of papers published in Results in Physics. Accepted letters will be sent to the author of the original paper for a response. Each letter and response is published together. Letters should be received within 8 weeks of the article''s publication. They should not exceed 750 words of text and 10 references.
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