Geometric shape’s impact on core-shell nanocomposites’ optical properties

IF 2.5 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Journal of Computational Electronics Pub Date : 2025-08-07 DOI:10.1007/s10825-025-02388-1

Shewa Getachew Mamo

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Abstract

This study presents a comprehensive theoretical and numerical investigation into the local field enhancement factor (LFEF) and optical bistability (OB) in ZnTe@Ag core-shell nanostructures embedded within dielectric host matrices. Using the quasi-static approximation, Laplace’s equation was analytically solved for both spherical and cylindrical geometries under appropriate boundary conditions. The Kerr-type nonlinearity of the host medium was incorporated to model third-order nonlinear optical effects. The dielectric response of the silver shell was described using a size-dependent Drude model. Numerical simulations revealed that spherical nanocomposites exhibit significantly stronger field enhancement and lower OB threshold intensities compared to cylindrical counterparts. Additionally, increasing the host dielectric constant or core-shell radius ratio resulted in pronounced shifts in resonance peaks and broadened bistability regions. The LFEF was found to be highly tunable with respect to geometry, size, and material composition, reaching intensities up to three times greater in spherical structures. These findings provide crucial insight into the geometric and dielectric modulation of nonlinear optical behavior, supporting the design of nanostructures for use in optical sensing, memory, and switching devices.

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几何形状对核-壳纳米复合材料光学性能的影响

本研究对介电基质中嵌入ZnTe@Ag核壳纳米结构的局部场增强因子（LFEF）和光学双稳定性（OB）进行了全面的理论和数值研究。利用准静态近似，在适当的边界条件下，对球面几何和圆柱几何的拉普拉斯方程进行了解析求解。利用宿主介质的克尔型非线性来模拟三阶非线性光学效应。用尺寸相关的德鲁德模型描述了银壳的介电响应。数值模拟表明，与圆柱形纳米复合材料相比，球形纳米复合材料具有更强的场增强和更低的OB阈值强度。此外，增加主介质常数或核壳半径比会导致共振峰的明显移位和双稳区变宽。研究发现，LFEF在几何形状、尺寸和材料组成方面具有高度可调性，在球形结构中达到三倍以上的强度。这些发现为非线性光学行为的几何和介电调制提供了重要的见解，支持了用于光学传感、存储和开关器件的纳米结构的设计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Computational Electronics ENGINEERING, ELECTRICAL & ELECTRONIC-PHYSICS, APPLIED

CiteScore

4.50

自引率

4.80%

发文量

142

审稿时长

>12 weeks

期刊介绍： he Journal of Computational Electronics brings together research on all aspects of modeling and simulation of modern electronics. This includes optical, electronic, mechanical, and quantum mechanical aspects, as well as research on the underlying mathematical algorithms and computational details. The related areas of energy conversion/storage and of molecular and biological systems, in which the thrust is on the charge transport, electronic, mechanical, and optical properties, are also covered. In particular, we encourage manuscripts dealing with device simulation; with optical and optoelectronic systems and photonics; with energy storage (e.g. batteries, fuel cells) and harvesting (e.g. photovoltaic), with simulation of circuits, VLSI layout, logic and architecture (based on, for example, CMOS devices, quantum-cellular automata, QBITs, or single-electron transistors); with electromagnetic simulations (such as microwave electronics and components); or with molecular and biological systems. However, in all these cases, the submitted manuscripts should explicitly address the electronic properties of the relevant systems, materials, or devices and/or present novel contributions to the physical models, computational strategies, or numerical algorithms.