Wideband THz Absorber: By Merging the Resonance of Dielectric Cavity and Graphite Disk Resonator

Design of an ultra‐broadband microwave metamaterial absorber based on multilayer structures

“…Jaumann absorber with a multilayer structure obtains a wider absorption bandwidth due to complex reflection in the interference medium, which can achieve wideband impedance match with free space according to equivalent circuit model (ECM) 9 . Nowadays, many designs have been proposed to overcome the limitation of bandwidth and thickness, that is, circuit analog absorber (CAA), 10 frequency selective surface (FSS), multilayer metamaterial absorber, 11 and multiple resonances 12,13 …”

“…9 Nowadays, many designs have been proposed to overcome the limitation of bandwidth and thickness, that is, circuit analog absorber (CAA), 10 frequency selective surface (FSS), multilayer metamaterial absorber, 11 and multiple resonances. 12,13 Many multilayer units have been proposed to achieve wideband absorption or radar cross-section (RCS) reduction. [14][15][16][17][18][19][20][21][22][23][24][25][26] An ordinary design idea is to combine multiple single-band (SB) absorbers operating in different frequencies using a multi-layer structure and ultimately achieve absorption in the broadband range.…”

Bipolar charge trapping for absorption enhancement in a graphene-based ultrathin dual-band terahertz biosensor

“…Their extraordinary properties made the implementation of cloaks 2,3 , invisible carpet 4 and a perfect lens 5 possible. The current research trends are moving in the direction of implementing the terahertz (THZ) devices like antennas 6 , sensors [7][8][9] , filters 10 and absorbers 11 . The purpose of implementing the THz absorbers is enabling the technology in spectroscopy 12 , detection and sensing 13 and many more 14 .…”

“…The recent implementations discuss about the development of narrowband sensors with multi-layered media with complex structures having large thickness 17,20,21 . Another challenge in the implementation of sensors is making the response independent of incident angle and polarization of the incident electromagnetic wave 7,11 . This feature enables the sensor to be used in the dynamic sensing systems which can be utilized in the handheld devices 22 .…”

Monolayer-Graphene-Based Tunable Absorber in the Near-Infrared

“…Graphene can absorb light over a broad spectrum spanning from the ultraviolet to the terahertz spectral regime due to its gapless nature and its ability to modulate the absorption by controlling the inter-band and intra-band transitions [1]. Therefore, graphene is an ideal material for optoelectronic devices such as photo-detectors [2], filters [3], switches [4], sensors [5,6], and modulators [7]. However, the absorption of monolayer graphene is only 2.3%, which is far from meeting the requirements of optoelectronic devices.…”