Single and cascaded, magnetically controllable metasurfaces as terahertz filters

Date
2016
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Source Title
Optical Society of America. Journal B : Optical Physics
Print ISSN
0740-3224
Electronic ISSN
Publisher
Optical Society of America OSA
Volume
33
Issue
5
Pages
834 - 841
Language
English
Type
Article
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Abstract

Transmission of a normally incident, linearly polarized, plane wave through either a single electrically thin metasurface comprising H-shaped subwavelength resonating elements made of magnetostatically controllable InAs or a cascade of several such metasurfaces was simulated in the terahertz regime. Stop bands that are either weakly or strongly controllable can be exhibited by a single metasurface by proper choice of the orientation of the magnetostatic field, and a ∼19%downshift of stop bands in the 0.1-5.5 THz spectral regime is possible on increasing the magnetostatic field strength from 0 to 1 T. Better controllability and wider bandwidths are possible by increasing the number of metasurfaces in a cascade, although increase of the total losses can lead to some restrictions. ON/OFF switching regimes, realizable either by applying/removing the magnetostatic field or just by changing its orientation, exist.

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Keywords
Bandpass filters, Terahertz waves, Linearly polarized, Magnetostatic field, Metasurface, Metasurfaces, Resonating elements, Sub-wavelength, Tera hertz, Terahertz filters, Magnetostatics
Citation
Published Version (Please cite this version)