Design of tunable dual-band absorber based on phase transition of VO2 in terahertz metasurface

Cong Chen; Hai Liu

doi:10.1117/12.2605450

9 September 2021 Design of tunable dual-band absorber based on phase transition of VO₂ in terahertz metasurface

Cong Chen, Hai Liu

Proceedings Volume 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021); 119090O (2021) https://doi.org/10.1117/12.2605450
Event: Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 2021, Chengdu, China

Abstract

A VO₂ -based Terahertz metasurface is proposed, and the cell structure consists of two parts. One part is composed of VO₂ blocks connected by metal rings with different radius, and the other part is a VO₂ square ring. The conductance coupling between the metal structures can be manipulated by the metal-insulator phase transition of VO₂ to change the LSPR resonance mode. The transformation realizes active tunable dual-band absorption of the terahertz wave, and the effects of incident wave angle and polarization mode on the frequency response characteristics of the structure are investigated respectively. Subsequently, the theoretical study on the Terahertz metamaterial absorber is carried out, and the results indicate that the two absorption peaks are generated by the autonomous resonance of gold rings with different radius when the temperature is 25°C The absorption rate of the absorber can reach 98% and 92% at f THz = 4.16 and f THz = 5.75 , respectively. When the temperature exceeds the VO₂ phase transition temperature (68°C), the VO₂ block is combined with metal rings of different radius to form a current closed-loop which would cause unified resonance and coupling with the VO₂ square ring. Meanwhile, the absorption rate of the absorber can reach 90% at f THz = 5.27 and f THz = 8.5 . In addition, the influence of the external dielectric constant and structural parameters on the absorption characteristics is analyzed, and the applications of the absorber in sensing and thickness detection are explored to obtain the responding sensing detection performance. The conclusions are beneficial for the design of actively tunable Terahertz metasurface absorbers and have many potential applications in the detection field.

Citation Download Citation

Cong Chen and Hai Liu "Design of tunable dual-band absorber based on phase transition of VO₂ in terahertz metasurface", Proc. SPIE 11909, Tenth International Symposium on Ultrafast Phenomena and Terahertz Waves (ISUPTW 2021), 119090O (9 September 2021); https://doi.org/10.1117/12.2605450

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Absorption

Metals

Gold

Dielectrics

Terahertz radiation

Electromagnetism

Magnetism

Show All Keywords

Keywords/Phrases

Search In:

Publication Years