Related Experiment Video
Updated: Feb 7, 2026
11:42
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
16.1K
Electrically Tunable Broadband Terahertz Absorption with Hybrid-Patterned Graphene Metasurfaces
Longfang Ye1,2, Xin Chen3, Guoxiong Cai4
1Institute of Electromagnetics and Acoustics, and Department of Electronic Science, Xiamen University, Xiamen 361005, China. lfye@xmu.edu.cn.
Nanomaterials (Basel, Switzerland)
|July 26, 2018
Summary
We developed a tunable graphene metasurface absorber for broadband terahertz (THz) waves. This polarization-insensitive device offers wide-angle absorption, crucial for advanced THz applications.
Area of Science:
- Metamaterials
- Optics and Photonics
- Condensed Matter Physics
Background:
- Terahertz (THz) technology requires efficient absorbers for various applications.
- Graphene metasurfaces offer unique electromagnetic properties for THz wave manipulation.
- Existing THz absorbers often suffer from polarization dependence or limited bandwidth.
Purpose of the Study:
- To numerically demonstrate a novel broadband THz absorber.
- To achieve polarization-insensitive and wide-angle absorption.
- To enable active tunability of THz absorption.
Main Methods:
- Utilizing a hybrid-patterned graphene metasurface on a multilayer substrate.
- Numerical simulations to analyze absorption spectra and electromagnetic response.
- Investigating the effect of graphene Fermi energy for active tuning.
Main Results:
- Achieved broadband absorption (>90%) with a fractional bandwidth of 84.5% (1.38-3.4 THz).
- Demonstrated absolute polarization independence for transverse electric (TE) and transverse magnetic (TM) waves.
- Maintained significant absorption (>60%) over a wide incident angle range (0°-60°).
- Showcased active tunability by varying graphene Fermi energy, altering absorbance from >90% to <20%.
Conclusions:
- The proposed graphene metasurface absorber exhibits excellent broadband, polarization-insensitive, and wide-angle absorption properties.
- Active tunability via Fermi energy modulation enhances its applicability.
- Potential applications include THz sensing, detection, imaging, and cloaking.
Related Concept Videos
01:21IR Absorption Frequency: Hybridization
1.4K
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
1.4K
02:29Hybrid Zones
22.0K
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
22.0K
01:19Drug Absorption: Factors Affecting GI Absorption
6.3K
The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.
6.3K
03:24Hybridization of Atomic Orbitals I
67.7K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
67.7K
03:35Hybridization of Atomic Orbitals II
49.2K
sp3d and sp3d 2 Hybridization
49.2K
01:06Fixed Action Patterns
17.7K
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
17.7K