Perfect metamaterial absorber based on the circular or elliptical cavity with one side open in the terahertz region

ABSTRACT

In this work, we present the analysis and design of a perfect metamaterial absorber (MA) based on the circular cavity with one side open in the terahertz region. This structure consists of a metal plate where one circular cavity with one side open is vertically placed on. Based on the circular-cavity-theory, a formula can be used to calculate the resonant frequency. In terms of normal incidence, the simulated results show that the MA has one resonance point on 6.674 THz, which is consistent with the calculated results. What’s more, we present the distribution of E-field, surface current distribution and power loss density distribution in the cavity, and use the standing wave theory and electric dipole to prove the physical mechanism of the perfect absorption. Finally, an MA based on elliptical cavity with one side open is also studied. These results verify the application of resonant cavities in the field of MA.

KEYWORDS:

• Metamaterial absorber
• circular/elliptical cavity
• standing wave
• electric dipole

Acknowledgments

This work is supported by the National Natural Science Foundation of China [grant number 61275070] and Shanghai Natural Science Foundation [grant number 15ZR1415900].

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Xiaojie Lu

Xiaojie Lu was born in Shanghai, China, in 1995. He received the BS degree in communication engineering from Shanghai University in 2017, where he is currently pursuing the MS degree in electromagnetic field and microwave technology. His current research interest is metamaterial absorber.

Zhongyin Xiao

Zhongyin Xiao received the MS degree in college of science from Shanghai University in 2002, and received the PHD degree in college of communication and information engineering from Shanghai University in 2005. He is now a researcher and doctoral tutor in college of communication and information engineering, Shanghai University. His main research fields are microwave and millimeter wave circuits, electromagnetic wave transmission in complex media and optical waveguide theory and technology. He has published more than 50 papers in academic journals at home and abroad, including more than 20 papers in SCI and 4 patents.

Mingming Chen

Mingming Chen was born in Wuhu, Anhui, China, in 1994. He received the BS degree in electronic information engineering from Nantong University in 2017. He is currently pursuing the MS degree in electromagnetic field and microwave technology in Shanghai University. His current research interest is electromagnetically induced transparency.