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Angle- and polarization-insensitive metamaterial absorber based on vertical and horizontal symmetric slotted sectors
This novel vertically and horizontally symmetric slotted-sector design aims to realize an angle- and polarization-insensitive metamaterial absorber. The unit-cell symmetries achieve polarization insensitivity, while an optimized slotted-sector inner angle enables angle insensitivity. Because the abs...
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Published in: | Applied optics. Optical technology and biomedical optics 2016-10, Vol.55 (29), p.8301 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | This novel vertically and horizontally symmetric slotted-sector design aims to realize an angle- and polarization-insensitive metamaterial absorber. The unit-cell symmetries achieve polarization insensitivity, while an optimized slotted-sector inner angle enables angle insensitivity. Because the absorptivity of a metamaterial absorber depends on the incident angle and polarization, many researchers have studied angle- and polarization-insensitive unit cells. In this work, a novel vertically and horizontally symmetric slotted sector is proposed in order to realize an angle- and polarization-insensitive metamaterial absorber. The absorber performance is demonstrated with full-wave simulation and measurements. Angular sensitivity is studied for different slotted-sector inner angles. For an 85° inner angle, the simulated absorptivity exceeds 90% and the frequency variation is less than 1.2% up to 70° incidence. The measured absorptivity at 10.34 GHz is close to 98.5% for all polarization angles at normal incidence. As the incidence angle varies from 0° to 70°, the measured absorptivity at 10.34 GHz remains above 90% in the transverse electric mode. |
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ISSN: | 2155-3165 |
DOI: | 10.1364/ao.55.008301 |