Journal
NANOPHOTONICS
Volume 9, Issue 10, Pages 3165-3196Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0111
Keywords
broadband; broadband absorber; broadband metalens; constitutive parameter; metamaterial; metamaterial-based device
Categories
Funding
- National Research Foundation (NRF) [NRF-2019M3A6B3031046, NRF-2018M3D1A1058998]
- Ministry of Science and ICT (MSIT), Republic of Korea
- National Research Foundation of Korea [2019M3A6B3031046] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Metamaterials can possess extraordinary properties not readily available in nature. While most of the early metamaterials had narrow frequency bandwidth of operation, many recent works have focused on how to implement exotic properties and functions over broad bandwidth for practical applications. Here, we provide two definitions of broadband operation in terms of effective material properties and device functionality, suitable for describing materials and devices, respectively, and overview existing broadband metamaterial designs in such two categories. Broadband metamaterials with nearly constant effective material properties are discussed in the materials part, and broadband absorbers, lens, and hologram devices based on metamaterials and metasurfaces are discussed in the devices part.
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