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Ultra-broadband plasmonic absorber based on titanium nanoholes array structure

S. XIONG1, B. LIU2, F. CHEN2,*

Affiliation

  1. Yangtze University College of Aits and Science, Jingzhou 434023, China
  2. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, 434023, China

Abstract

This paper demonstrates an ultra-broadband plasmonic absorber utilizing a titanium nanohole metasurface in the infrared region. Numerical simulations based on the finite-difference time-domain (FDTD) method reveal that the maximum absorption reaches approximately 96.4 %, with a 90 % absorption bandwidth exceeding 1415 nm. The broadband absorption is attributed to the excitation of the hybrid cavity-plasmon mode and gap plasmon coupling between adjacent nanoholes. Additionally, the effects of various metal materials and geometrical configurations on the proposed absorber are systematically investigated. We anticipate that this ultra-broadband absorber holds significant potential for applications in solar cells and infrared plasmonic detection.

Keywords

Plasmonic resonance, Titanium, Ultra-broadband perfect absorption, Solar cell.

Citation

S. XIONG, B. LIU, F. CHEN, Ultra-broadband plasmonic absorber based on titanium nanoholes array structure, Optoelectronics and Advanced Materials - Rapid Communications, 19, 9-10, September-October 2025, pp.430-435 (2025).

Submitted at: Feb. 12, 2025

Accepted at: Oct. 10, 2025