Advancements in tunable and multifunctional metamaterial absorbers: a comprehensive review of microwave to terahertz frequency range
Document Type
Article
Publication Date
7-1-2024
Abstract
Over the past two decades, metamaterial absorbers have undergone significant advancements, evolving from microwave single-frequency designs to multi-frequency and broadband absorption, extending into the terahertz band. These absorbers have transitioned from unadjustable to adjustable and multifunctional configurations, enabled by the integration of adjustable materials, mechanical structures, and semiconductor devices. This article provides a comprehensive review of the progress achieved in the microwave to terahertz frequency range over the last five years. Key aspects covered include the absorbing mechanism of metamaterials in the microwave frequency band, with absorption efficiencies exceeding 90% for specific frequency ranges. The development of adjustable absorbers allows for frequency tunability within +/- 10% of the central frequency, while multifunctional absorbers enable concurrent control over absorption and reflection properties. In the terahertz regime, advanced electromagnetic simulations have led to absorber designs with bandwidths exceeding 50% of the central frequency, resulting in absorption efficiencies above 80% over the entire bandwidth. Integration of gallium nitride-based gallium nitride high electron mobility transistors provides fast switching speeds below 100 ns, facilitating rapid reconfiguration of absorber functionalities. These advancements in metamaterial absorbers offer promising prospects for intelligent and integrated designs in future applications.
Keywords
metamaterial, absorber, adjustable, multifunctional, gallium nitride
Divisions
mechanical,InstituteofBiologicalSciences
Funders
Ministry of Education, Malaysia (IIRG018D-2019)
Publication Title
Journal of Physics D: Applied Physics
Volume
57
Issue
29
Publisher
Institute of Physics
Publisher Location
TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND