Design of a concise and dual-band tunable metamaterial absorber

Abstract

We theoretically present a concise and tunable dual-band metamaterial absorber composed of a typical metaldielectric-metal structure in the terahertz regime. The dual-band absorption originates from two different resonance modes induced in one square ring, which is different from the common dual-band absorber composed of a super unit with several different-sized structures. The proposed absorber can realize dynamic tunability through changing the permittivity of the dielectric layer by applying different temperatures. Other good performances, such as a wide incident angle and polarization insensitivity, are also available for the proposed absorber. Such a metamaterial absorber is a promising candidate for terahertz imaging and detection.

Simple design of a six-band terahertz perfect metasurface absorber based on a single resonator structure

“…The corresponding absorbance is about 98.1%, 98.6%, 98.8%, 99.9%, 99.3% and 99.7%, respectively. These results suggest that we can achieve six-band nearly perfect absorption by only utilizing one metallic patterned resonator structure, which is different from previous multimer structures [20][21][22][23][24][25][26][27][28]. The absorption peak at different frequencies is corresponding to the nature of the different resonance's modes, which will be further illustrated and classified by analyzing the distributions of the electric field of the unit-cell structure.…”

“…Metasurface absorber (MSA) as a booming branch of MMs usually exhibit perfect absorption with the attractive properties, such as relative thinner thickness, compact structure and flexible design [10][11][12][13][14][15][16][17][18]. In particularly, the terahertz (THz) MSA has been paid great attention increasingly [19][20][21], since it can be potential application in sensing and imaging [22,23]. In early stages, most of MSAs are operated in a narrow-/single-band or dual-band frequency range [20][21][22][23], which are severely impractical in some application.…”

“…In particularly, the terahertz (THz) MSA has been paid great attention increasingly [19][20][21], since it can be potential application in sensing and imaging [22,23]. In early stages, most of MSAs are operated in a narrow-/single-band or dual-band frequency range [20][21][22][23], which are severely impractical in some application.…”

An Innovative Polarisation-Insensitive Perfect Metamaterial Absorber with an Octagonal-Shaped Resonator for Energy Harvesting at Visible Spectra

“…The minimum reflection of the incident wave occurs when there is adequate alignment between the meta-surface impedance and the open space impedance [ 11 ]. For instance, Li et al [ 12 ] presented a brief and adaptable perfect absorber featuring a strontium titanate (STO) crystal substrate, where the absorber was tuneable in dual-band. The design structure demonstrated a maximal absorption peak, reaching 97.97% and 95.92% at frequencies of 0.15 THz and 0.30 THz, respectively.…”