Cylindrical Composite Hybrid Plasmonic Waveguides with Ultra-Strong Field Confinements: A FEM Study

IF 4.3 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL Plasmonics Pub Date : 2024-05-20 DOI:10.1007/s11468-024-02352-y

Yongmei Tian, Rumeng Zhang, Da Teng

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Abstract

Surface plasmons have the unique advantages of local field enhancement and subwavelength field confinement, thus have been widely used in subwavelength photonic as well as nanoscale imaging, nano-lasers, and nonlinear optics. In this work, we report a cylindrical composite hybrid plasmonic waveguide, which supports a plasmon mode with ultra-strong field confinement that is formed due to the coupling of the surface plasmon mode in the Na nanowire waveguide and hybrid surface plasmon mode in the Na-based cylindrical hybrid waveguide. The modal properties of the proposed waveguide are thoroughly investigated by using the finite element method. The proposed structure allows the mode coupling to be enhanced, which in turn gives it superior performance. Further, the optimized parameters are determined, under which the waveguide exhibits an ultra-small normalized mode area of 1.52 × 10⁻⁵ and a high figure of merit over 3.2 × 10³. The proposed waveguide may make a contribution to the development of nanoscale devices in photonic integrated circuits, such as nanowaveguides, resonators, and nano-lasers.

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具有超强场约束的圆柱形复合混合质子波导：有限元研究

表面等离子体具有局部场增强和亚波长场约束的独特优势，因此在亚波长光子、纳米成像、纳米激光和非线性光学等领域得到了广泛的应用。在这项工作中，我们报道了一种圆柱形复合混合等离子体波导，它支持具有超强场约束的等离子体模式，这种模式是由于Na纳米线波导中的表面等离子体模式和Na基圆柱形混合波导中的混合表面等离子体模式耦合而形成的。采用有限元方法对该波导的模态特性进行了深入的研究。所提出的结构允许增强模式耦合，从而使其具有优越的性能。进一步，确定了优化参数，在优化参数下，波导具有1.52 × 10−5的超小归一化模面积和超过3.2 × 103的高品质系数。所提出的波导可能会对光子集成电路中纳米器件的发展做出贡献，如纳米波导、谐振器和纳米激光器。

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来源期刊

Plasmonics 工程技术-材料科学：综合

CiteScore

5.90

自引率

6.70%

发文量

164

审稿时长

2.1 months

期刊介绍： Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.