Si3N4 Dielectric Hemi-sphere Arrayed Plasmonic Metasurface With Top Metal Coating for Multiresonant Absorption in NIR Regime

IF 3.3 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL Plasmonics Pub Date : 2024-07-20 DOI:10.1007/s11468-024-02427-w

Prasanta Mandal

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Abstract

Present report focuses on the design and optical perfect absorption/reflection properties of novel plasmonic metasurface made of square array of Si₃N₄ hemi-spheres on flat Si₃N₄ surface. The whole structure is sandwiched between flat gold layer and top gold coating. Theoretical study using Finite Difference Time Domain (FDTD) computation shows multiple near perfect absorptions (80–100%) with narrow line width (~ 50 nm) between 550 to 1500 nm. Four distinct absorption peaks (or reflection dips) are observed at 1020 nm (A1), 888 nm (A2), 614 nm (A3), 740 nm (A4) which can be manipulated by varying structural parameters such as period, hemi-sphere diameter and top gold coating thickness. These multiple absorptions arise due to electric dipolar resonance, magnetic resonance, excitation of various surface plasmon modes (such as (1,0); (2,0); (1,1)) and cavity mode, as evident from near-field analysis. With appropriate structural parameters, multiband well resolved near perfect absorptions are achieved at desired wavelengths. The proposed metasurface is insensitive to the polarization of excitation beam, and has relatively large launch angle tolerance (~ 20°), making it suitable for optical and optoelectronic device integration.

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带顶层金属涂层的 Si3N4 介电半球阵列质子元表面，用于近红外波段的多共振吸收

本报告的重点是新型等离子体元表面的设计和完美的光学吸收/反射特性，该表面是在平坦的 Si3N4 表面上由 Si3N4 半球组成的方形阵列。整个结构夹在平面金层和顶层金涂层之间。使用有限差分时域（FDTD）计算方法进行的理论研究显示，在 550 至 1500 纳米之间有多个近乎完美的吸收（80%-100%），线宽较窄（约 50 纳米）。在 1020 nm (A1)、888 nm (A2)、614 nm (A3)、740 nm (A4) 处观察到四个不同的吸收峰（或反射凹点），可通过改变周期、半球直径和顶部金涂层厚度等结构参数来调节。从近场分析可以看出，这些多重吸收是由于电偶极共振、磁共振、各种表面等离子体模式（如 (1,0)；(2,0)；(1,1)）和空腔模式的激发而产生的。通过适当的结构参数，可在所需波长实现多波段良好分辨的近乎完美的吸收。所提出的元表面对激发光束的偏振不敏感，并且具有相对较大的发射角公差（~ 20°），因此适合光学和光电器件集成。

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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.