Nanoantennas Inversely Designed to Couple Free Space and a Metal-Insulator-Metal Waveguide

doi:10.3390/nano11123219

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	Nanoantennas Inversely Designed to Couple Free Space and a Metal-Insulator-Metal Waveguide
	Y. M. Han; Y. Lin; W. Ma; J. G. Korvink; H. G. Duan and Y. B. Deng
	2021
发表期刊	Nanomaterials
卷号	11 期号:12 页码:17
摘要	The metal-insulator-metal (MIM) waveguide, which can directly couple free space photons, acts as an important interface between conventional optics and subwavelength photoelectrons. The reason for the difficulty of this optical coupling is the mismatch between the large wave vector of the MIM plasmon mode and photons. With the increase in the wave vector, there is an increase in the field and Ohmic losses of the metal layer, and the strength of the MIM mode decreases accordingly. To solve those problems, this paper reports on inversely designed nanoantennas that can couple the free space and MIM waveguide and efficiently excite the MIM plasmon modes at multiple wavelengths and under oblique angles. This was achieved by implementing an inverse design procedure using a topology optimization approach. Simulation analysis shows that the coupling efficiency is enhanced 9.47-fold by the nanoantenna at the incident wavelength of 1338 nm. The topology optimization problem of the nanoantennas was analyzed by using a continuous adjoint method. The nanoantennas can be inversely designed with decreased dependence on the wavelength and oblique angle of the incident waves. A nanostructured interface on the subwavelength scale can be configured in order to control the refraction of a photonic wave, where the periodic unit of the interface is composed of two inversely designed nanoantennas that are decoupled and connected by an MIM waveguide.
DOI	10.3390/nano11123219
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收录类别	sci
语种	英语
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/66892
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Y. M. Han,Y. Lin,W. Ma,et al. Nanoantennas Inversely Designed to Couple Free Space and a Metal-Insulator-Metal Waveguide[J]. Nanomaterials,2021,11(12):17.
APA	Y. M. Han,Y. Lin,W. Ma,J. G. Korvink,&H. G. Duan and Y. B. Deng.(2021).Nanoantennas Inversely Designed to Couple Free Space and a Metal-Insulator-Metal Waveguide.Nanomaterials,11(12),17.
MLA	Y. M. Han,et al."Nanoantennas Inversely Designed to Couple Free Space and a Metal-Insulator-Metal Waveguide".Nanomaterials 11.12(2021):17.

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