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Title: A Zero‐Rank, Maximum Nullity Perfect Electromagnetic Wave Absorber

Journal Article · · Advanced Optical Materials

Abstract Electromagnetic wave absorbers formed from a metamaterial layer are demonstrated and near‐perfect absorption is realized across much of the spectrum. Alternatively, an unpatterned low‐loss dielectric layer forms an absorber of coherent light and shows near‐zero reflectance and high absorption. The latter is termed a coherent perfect absorber (CPA) and may be described as a time‐reversed laser. Here, a more fundamental system of dielectric metasurfaces is experimentally demonstrated, which may achieve either coherent or incoherent absorption. The absorber is viewed as two CPAs with eigenmodes of opposite symmetry, and may achieve incoherent absorption with a null scattering matrix, or coherent absorption with a rank‐1 scattering matrix. Metasurface absorbers are classified based on their scattering matrix rank and nullity. The demonstrated system and theory establish a path to realize a new class of absorbers useful for future novel applications, including hyperspectral imaging and energy harvesting.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐SC0014372
OSTI ID:
1492481
Journal Information:
Advanced Optical Materials, Journal Name: Advanced Optical Materials Vol. 7 Journal Issue: 8; ISSN 2195-1071
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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