Abstract
Perfect absorption based on metamaterials at terahertz frequencies range has attracted a great deal of interest in the field of sensing, imaging, bolometers and stealth technology. This review is focused on presenting several recently developed absorbers based on all-silicon metamaterials, such as single-band, dual-band, multi-band and broadband absorbers. The partial physical mechanisms and optical tunability corresponding to the absorption are also reported. Furthermore, the presented absorbers can be used to detect the concentration of trace pesticides, and a good linear regression coefficient was obtained between the absorption amplitude and the concentration. Notably, the presented all-silicon metamaterials perfect absorbers are compatible with COMS processing which is beneficial to promote the development of terahertz functional devices.
Highlights
Metamaterial is artificial material with periodical arrangement of unit resonator, which has attracted considerable research interest in the past few decades [1,2,3,4,5]
Perfect metamaterial absorber in terahertz (THz) range is an important research topic to explore the potential of this special frequency region, and has become an effective means to fill the “THz gap” in the electromagnetic spectrum [6,7,8]
Schematic of designed THz plasmonic metamaterial absorbers (PMAs) of the designed PMAs is shown in Fig. 1(a) and 1(b)
Summary
Metamaterial is artificial material with periodical arrangement of unit resonator, which has attracted considerable research interest in the past few decades [1,2,3,4,5]. Perfect metamaterial absorber in terahertz (THz) range is an important research topic to explore the potential of this special frequency region, and has become an effective means to fill the “THz gap” in the electromagnetic spectrum [6,7,8] Such metamaterials can achieve resonance with the incident electromagnetic over a designed frequency region and match the impedance of the free-space, and implementing a near-unit absorption property [9, 10]. We will introduce a series of works on all-silicon terahertz metamaterials absorber carried out by our research group, including the device design, absorption mechanism, tunable characteristics under optical-pump THz-probe (OPTP). It contains diverse kinds of metamaterial absorber designs exhibiting different resonance properties, such as single-band, multi-band, broadband all-silicon absorbers. The analysis and research of all-silicon metamaterials have enriched the design strategy of metamaterials devices and their application value, and brought new development for implementation of tunable metamaterial and new-type detection techniques
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