Carbon-based ultrabroadband tunable terahertz metasurface absorber

Aiqiang Nie; Xiaoyong He; Wenhan Cao

doi:10.1117/1.APN.3.1.016007

Journals >Advanced Photonics Nexus >Volume 3 >Issue 1 >Page 016007 > Article

Advanced Photonics Nexus
Vol. 3, Issue 1, 016007 (2024)

Carbon-based ultrabroadband tunable terahertz metasurface absorber | Editors' Pick

Aiqiang Nie¹, Xiaoyong He^2,*, and Wenhan Cao^1,3,*

Author Affiliations

¹ShanghaiTech University, School of Information Science and Technology, Shanghai, China

²Shanghai Normal University, Mathematics and Science College, Department of Physics, Shanghai, China

³Shanghai Engineering Research Center of Energy Efficient and Custom AI IC, Shanghai, China

show less

DOI: 10.1117/1.APN.3.1.016007 Cite this Article Set citation alerts

Aiqiang Nie, Xiaoyong He, Wenhan Cao, "Carbon-based ultrabroadband tunable terahertz metasurface absorber," Adv. Photon. Nexus 3, 016007 (2024) Copy Citation Text

EndNote(RIS)

BibTex

Plain Text

show less

Fig. 1. Schematic diagram of broadband absorber structure: (a) three-dimensional structure, (b) top view of a unit cell, and (c) split diagram of a unit cell.

Download full size | View in the Article

(a)–(d) Absorption curves of evolutionary structures (Ef=1 eV).

Fig. 2. (a)–(d) Absorption curves of evolutionary structures (

E_{f} = 1 eV

Download full size | View in the Article

Fig. 3. (a)–(d) Influence of different structural parameters on the performance of the absorber (

E_{f} = 1 eV

Download full size | View in the Article

Fig. 4. Absorption curves of the absorber at

0 - 1 eV

graphene Fermi energy levels (the absorption bandwidth at 1 eV is 8.99 THz).

Download full size | View in the Article

Fig. 5. Equivalent parameters (

E_{f} = 1 eV

): (a) relative impedance, (b) equivalent dielectric constant, and (c) equivalent magnetic permeability.

Download full size | View in the Article

Fig. 6. (a) split diagram of a unit cell, (b) electrical circuit, and (c) comparison of absorption curves obtained by simulation and ECM (

E_{f} = 1 eV

Download full size | View in the Article

Fig. 7. The absolute field distribution and field distribution of vector (

E_{f} = 1 eV

): (a) E-field (

f = 8.34 THz

), (b) E-field (

f = 14.66 THz

), (c) H-field (

f = 8.34 THz

), and (d) H-field (

f = 14.66 THz

Download full size | View in the Article

Fig. 8. The power loss (first row) on graphene (left) and graphite (right) and current density (second row) on the top (left) and bottom surfaces (right) in the absorber at frequency (

E_{f} = 1 eV

): (a) and (c) 8.34 THz; (b) and (d) 14.66 THz.

Download full size | View in the Article

Fig. 9. The absorption spectrum of the absorber (

E_{f} = 1 eV

): (a) different incident angles of TE mode, (b) different incident angles of TM mode, and (c) different polarization angles.

Download full size | View in the Article


Parameter	Value ( $μ m$ )
Unit cell periodicity ( $P$ )	3
Width of graphene interconnects ( $W$ )	0.05
Radius of graphene structure ( $R_{1}$ )	1.4
Outer radius of graphite ring ( $R_{2}$ )	0.9
Inner radius of graphite ring ( $R_{3}$ )	0.6
Radius of graphite circle ( $R_{4}$ )	0.5
Thickness of graphite ( $T_{1}$ )	0.1
Thickness of graphene ( $T_{2}$ )	0.001
Thickness of dielectric layer ( $T_{3}$ )	3
Thickness of substrate ( $T_{4}$ )	2

Table 1. Parameters of the designed carbon-based metasurface absorber.

View in the Article


Reference	Material	Frequency range (THz) ( $A > 90 %$ )	Bandwidth (THz)	Thickness ( $μ m$ )	Insensitive to $Φ$	Tunable
18	${VO}_{2} / metal$	2.6 to 7.5	4.9	76.5	Yes	Yes
21	Metal/graphene	3.4 to 9.1	5.7	9.5	Yes	Yes
47	${VO}_{2} / metal$	1.85 to 4.3	2.45	12.4	Yes	Yes
36	Graphite	0.65 to 3.03	2.38	50.2	Yes	No
37	Graphite	6.26 to 13.05	6.79	7	Yes	No
48	Graphene/metal	3.69 to 9.77	6.08	7.101	Yes	Yes
49	Graphene/metal	7 to 9.25	2.25	5.101	Yes	Yes
This work	Graphene/graphite	7.24 to 16.23	8.99	5.101	Yes	Yes