Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2019-02-01

Journal: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION

Included Journals: Scopus、SCIE

Volume: 36

Issue: 2

Page Number: 264-269

ISSN: 1084-7529

Key Words: 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

Abstract: 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