Microwave absorptions of ultrathin conductive films and designs of frequency-independent ultrathin absorbers
Source abstract
Abstract
We study the absorption properties of ultrathin conductive films in the microwave regime, and find a moderate absorption effect which gives rise to maximal absorbance 50% if the sheet (square) resistance of the film meets an impedance matching condition. The maximal absorption exhibits a frequency-independent feature and takes place on an extremely subwavelength scale, the film thickness. As a realistic instance, ∼5 nm thick Au film is predicted to achieve the optimal absorption. In addition, a methodology based on metallic mesh structure is proposed to design the frequency-independent ultrathin absorbers. We perform a design of such absorbers with 50% absorption, which is verified by numerical simulations.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Metamaterials and Metasurfaces Applications · Advanced Antenna and Metasurface Technologies · Electromagnetic wave absorption materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Soochow University 1 School of Physical Science and Technology, , 1 Shizi Street, Suzhou 215006, China
Soochow University 2 Institute of Modern Optical Technologies & Collaborative Innovation Center of Suzhou Nano Science and Technology, Jiangsu Key Lab of Advanced Optical Manufacturing Technologies, , 1 Shizi Street, Suzhou 215006, China
Funding
NNSFC
References (21)
Show source-provided references
1. 1999
2. Lightweight and flexible graphene foam composites for high-performance electromagnetic interference shielding10.1002/adma.201204196 ↗
3. Ultra-thin perfect absorber employing a tunable phase change material10.1063/1.4767646 ↗
4. Broadband light absorption enhancement in polymer photovoltaics using metal nanowall gratings as transparent electrodes10.1364/OE.20.012213 ↗
5. Maximized optical absorption in ultrathin films and its application to plasmon-based two-dimensional photovoltaics10.1021/nl101929j ↗
6. Perfect metamaterial absorber10.1103/PhysRevLett.100.207402 ↗
7. Ultrathin multiband gigahertz metamaterial absorbers10.1063/1.3608246 ↗
8. Ultra-broadband microwave metamaterial absorber10.1063/1.3692178 ↗
9. Materials and mechanics for stretchable electronics10.1126/science.1182383 ↗
10. Ultrathin and lightweight organic solar cells with high flexibility10.1038/ncomms1772 ↗
11. Transparent conductors—A status review10.1016/0040-6090(83)90256-0 ↗
12. Criteria for choosing transparent conductors10.1557/mrs2000.151 ↗
13. Emerging transparent electrodes based on thin films of carbon nanotubes, graphene, and metallic nanostructures10.1002/adma.201003188 ↗
14. Application of low resistivity Ga-doped ZnO films to transparent electromagnetic interference shielding material10.1016/j.tsf.2008.06.047 ↗
15. Broad band electromagnetic wave absorbers designed with nano-metal films10.1002/andp.200910389 ↗
16. Infrared absorption of thin metal films10.1364/JOSA.44.000188 ↗
17. Effective conductivity and microwave reflectivity of thin metallic films10.1109/TMTT.1982.1131380 ↗
18. Microwave absorption on a thin film10.1063/1.1556969 ↗
19. Measurement of ac conductivity of gold nanofilms at microwave frequencies10.1063/1.3436450 ↗
20. Nanopatterned metallic films for use as transparent conductive electrodes in optoelectronic devices10.1021/nl1011239 ↗
21. A two-dimensional nanopatterned thin metallic transparent conductor with high transparency from the ultraviolet to the infrared10.1063/1.4765341 ↗