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集成有具有高场增强的电抗表面的完美吸收效率圆形纳米盘阵列

Perfect Absorption Efficiency Circular Nanodisk Array Integrated with a Reactive Impedance Surface with High Field Enhancement.

作者信息

Anam Mohamad Khoirul, Choi Sangjo

机构信息

Department of Electrical Engineering, University of Ulsan, Ulsan 44610, Korea.

出版信息

Nanomaterials (Basel). 2020 Feb 2;10(2):258. doi: 10.3390/nano10020258.

DOI:10.3390/nano10020258
PMID:32024263
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7075211/
Abstract

Infrared (IR) absorbers based on a metal-insulator-metal (MIM) have been widely investigated due to their high absorption performance and simple structure. However, MIM absorbers based on ultrathin spacers suffer from low field enhancement. In this study, we propose a new MIM absorber structure to overcome this drawback. The proposed absorber utilizes a reactive impedance surface (RIS) to boost field enhancement without an ultrathin spacer and maintains near-perfect absorption by impedance matching with the vacuum. The RIS is a metallic patch array on a grounded dielectric substrate that can change its surface impedance, unlike conventional metallic reflectors. The final circular nanodisk array mounted on the optimum RIS offers an electric field enhancement factor of 180 with nearly perfect absorption of 98% at 230 THz. The proposed absorber exhibits robust performance even with a change in polarization of the incident wave. The RIS-integrated MIM absorber can be used to enhance the sensitivity of a localized surface plasmon resonance sensor and surface-enhanced IR spectroscopy.

摘要

基于金属-绝缘体-金属（MIM）结构的红外（IR）吸收器因其高吸收性能和简单结构而受到广泛研究。然而，基于超薄间隔层的MIM吸收器存在场增强低的问题。在本研究中，我们提出了一种新的MIM吸收器结构来克服这一缺点。所提出的吸收器利用反应阻抗表面（RIS）在没有超薄间隔层的情况下提高场增强，并通过与真空的阻抗匹配保持近乎完美的吸收。与传统金属反射器不同，RIS是接地介电基板上的金属贴片阵列，可改变其表面阻抗。安装在最佳RIS上的最终圆形纳米盘阵列在230太赫兹时提供180的电场增强因子，吸收率接近98%，近乎完美。即使入射波的极化发生变化，所提出的吸收器仍表现出稳健的性能。集成RIS的MIM吸收器可用于提高局部表面等离子体共振传感器和表面增强红外光谱的灵敏度。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/c11f37f2c167/nanomaterials-10-00258-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/4ae95afc42f2/nanomaterials-10-00258-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/fc41ce6b537b/nanomaterials-10-00258-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/d392c698861a/nanomaterials-10-00258-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/e1433920de7b/nanomaterials-10-00258-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/ff8d5ec1cb68/nanomaterials-10-00258-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/4580c78fa919/nanomaterials-10-00258-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/00ad6831937d/nanomaterials-10-00258-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/c11f37f2c167/nanomaterials-10-00258-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/4ae95afc42f2/nanomaterials-10-00258-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/fc41ce6b537b/nanomaterials-10-00258-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/d392c698861a/nanomaterials-10-00258-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/e1433920de7b/nanomaterials-10-00258-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/ff8d5ec1cb68/nanomaterials-10-00258-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/4580c78fa919/nanomaterials-10-00258-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/00ad6831937d/nanomaterials-10-00258-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/88e8/7075211/c11f37f2c167/nanomaterials-10-00258-g008.jpg

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