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Article

Ultrabroadband Absorption Enhancement via Hybridization of Localized and Propagating Surface Plasmons

1
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University, Wuxi 214122, China
2
Key Laboratory of Advanced Micro-Structured Materials MOE Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(9), 1625; https://doi.org/10.3390/nano10091625
Received: 27 July 2020 / Revised: 9 August 2020 / Accepted: 16 August 2020 / Published: 19 August 2020
Broadband metamaterial absorbers (MAs) are critical for applications of photonic and optoelectronic devices. Despite long-standing efforts on broadband MAs, it has been challenging to achieve ultrabroadband absorption with high absorptivity and omnidirectional characteristics within a comparatively simple and low-cost architecture. Here we design, fabricate, and characterize a novel compact Cr-based MA to achieve ultrabroadband absorption in the visible to near-infrared wavelength region. The Cr-based MA consists of Cr nanorods and Cr substrate sandwiched by three pairs of SiO2/Cr stacks. Both simulated and experimental results show that an average absorption over 93.7% can be achieved in the range of 400–1000 nm. Specifically, the ultrabroadband features result from the co-excitations of localized surface plasmon (LSP) and propagating surface plasmon (PSP) and their synergistic absorption effects, where absorption in the shorter and longer wavelengths are mainly contributed bythe LSP and PSP modes, respectively. The Cr-based MA is very robust to variations of the geometrical parameters, and angle-and polarization-insensitive absorption can be operated well over a large range of anglesunder both transverse magnetic(TM)- and transverse electric (TE)-polarized light illumination. View Full-Text
Keywords: metamaterial absorbers; ultrabroadband absorption; localized surface plasmon; propagating surface plasmon metamaterial absorbers; ultrabroadband absorption; localized surface plasmon; propagating surface plasmon
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MDPI and ACS Style

Sang, T.; Qi, H.; Wang, X.; Yin, X.; Li, G.; Niu, X.; Ma, B.; Jiao, H. Ultrabroadband Absorption Enhancement via Hybridization of Localized and Propagating Surface Plasmons. Nanomaterials 2020, 10, 1625. https://doi.org/10.3390/nano10091625

AMA Style

Sang T, Qi H, Wang X, Yin X, Li G, Niu X, Ma B, Jiao H. Ultrabroadband Absorption Enhancement via Hybridization of Localized and Propagating Surface Plasmons. Nanomaterials. 2020; 10(9):1625. https://doi.org/10.3390/nano10091625

Chicago/Turabian Style

Sang, Tian, Honglong Qi, Xun Wang, Xin Yin, Guoqing Li, Xinshang Niu, Bin Ma, and Hongfei Jiao. 2020. "Ultrabroadband Absorption Enhancement via Hybridization of Localized and Propagating Surface Plasmons" Nanomaterials 10, no. 9: 1625. https://doi.org/10.3390/nano10091625

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