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论文类型：期刊论文

发表时间：2014-11-15

发表刊物：OPTICS COMMUNICATIONS

收录刊物：SCIE、EI、Scopus

卷号：331

页面范围：154-159

ISSN号：0030-4018

关键字：Perfect absorption; Phase resonance; Metallic grating

摘要：In this study, a free-standing subwavelength metallic grating with grooves on its output surface is shown to have suppressed transmission and reflection simultaneously at different incident wavelengths both for normal incidence and oblique incidence, resulting in multi-order nearly perfect absorption. This extraordinary absorption originates from the phase resonance of this compound grating together with the contribution of the cavity modes (CMs) resonance in the grating slits. The CMs resonance gives rise to the suppressed reflection, and the phase resonance not only reinforces this suppression effect, but also blocks the transmission completely. Compared with the conventional perfect absorbers, this perfect absorber has obvious advantages, such as simple single layer structure, single material composition, can be achieved at multiple frequencies and wide angular range. (C) 2014 Elsevier B.V. All rights reserved.