Ultra-broadband perfect light absorber based on circular truncated cone structure Ti3C2Tx MXene across the visible to near-infrared region

Broadband perfect light absorbers (PLAs) are critical for advancing technologies such as stealth systems, thermal photovoltaics, and optical imaging, where efficient, spectrum-wide light absorption is essential. Here, we propose a novel, low-cost PLA design featuring a circular truncated cone (CTC) nanostructure composed of Ti₃C₂T_x MXene. Finite element method (FEM) simulations reveal exceptional performance, with over 99.5 % average absorbance across 280–1623 nm and a 141.1 % relative bandwidth, validated by equivalent circuit modeling (ECM). This efficiency stems from synergistic interactions between guided mode excitation, localized surface plasmon resonances (LSPRs), and intrinsic losses within the CTC geometry. The design maintains >99 % absorption, exhibiting polarization- and angle-insensitivity for transverse electric/magnetic modes, while geometric tunability enables customization for diverse applications, including solar harvesting, thermoelectrics, and thermal imaging. This work advances PLA technology by delivering ultra-broadband, robust, and adaptable absorption, addressing key limitations in existing designs.