- Ultraviolet broadband plasmonic absorber with dual visible and near-infrared narrow bands
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- 论文类型： 期刊论文
- 发表时间： 2019-02-01
- 发表刊物： JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
- 收录刊物： SCIE、Scopus
- 卷号： 36
- 期号： 2
- 页面范围： 264-269
- ISSN号： 1084-7529
- 关键字： Efficiency; Plasmonics; Plasmons; Surface plasmon resonance, Absorption efficiency; Cavity resonances; Geometric symmetry; Integrated device; Polarization independent; Three-layer dielectrics; Ultraviolet region; Visible and near infrared, Infrared devices
- 摘要： We propose an ultraviolet broadband plasmonic absorber with dual narrow bands located separately in the visible and near-infrared regions. It employs a three-layer dielectric and metallic film structure based on a ring square nanodisk array. The interaction of surface plasmon resonance with a Fabry-Perot cavity resonance results in perfect absorption. The absorption efficiency is greater than 99.9% at wavelengths of 660 and 919 nm (visible and near-infrared), respectively, under normal incidence. In the ultraviolet region from 240 to 500 nm, absorption efficiency of over 90% can be achieved. The geometric symmetry of the ring square makes the perfect absorber polarization-independent and insensitive to large incident angle. This perfect absorber, which combines broadband and narrowband absorption, can be used as sensors, solar cells, or thermal emitters within one integrated device with further investigations. (c) 2019 Optical Society of America
