01–20 THz ultra-broadband perfect absorber via a flat multi-layer structure | Zendy

Gongjie Xu | Zendy; Jun Zhang | Zendy; Xiaofei Zang | Zendy; Okihiro Sugihara | Zendy; Hongwei Zhao | Zendy; Bin Cai | Zendy

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01–20 THz ultra-broadband perfect absorber via a flat multi-layer structure

Author(s) -

Gongjie Xu,

Jun Zhang,

Xiaofei Zang,

Okihiro Sugihara,

Hongwei Zhao,

Bin Cai

Publication year - 2016

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.24.023177

Subject(s) - materials science , anti reflective coating , refractive index , optics , absorption (acoustics) , broadband , optoelectronics , substrate (aquarium) , terahertz radiation , layer (electronics) , dopant , silicon , polystyrene , doping , nanotechnology , composite material , oceanography , physics , geology , polymer

An ultra-broadband perfect absorber based on graded-index mechanism is designed and fabricated. The perfect absorber is comprised of a heavily-doped silicon absorption substrate and a flat six-layer antireflective structure. The refractive index of each layer was widely tuned by hollow polystyrene microsphere and TiO 2 nanoparticle dopants, which can offer a gradually changed refractive index profile from 1.3 to 2.9. The experimental results show that 98% absorption can be achieved within the range of 0.1-20 THz. Moreover, the high absorption efficiency as well as the ultra-broad range can maintain for incident angle from 0 to 75° by the theoretical simulation.

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