Journal
NANOPHOTONICS
Volume 10, Issue 6, Pages 1683-1690Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0627
Keywords
broadband optical absorber; infrared camouflage; long-wavelength infrared; refractory materials; ultra-thin absorber
Categories
Funding
- National Natural Science Foundation of China [MOST 2017YFA0205800]
- [91850207]
- [11674256]
Ask authors/readers for more resources
This paper presents the design and fabrication of an ultra-thin, broadband long-wavelength infrared (LWIR) optical absorber with over 95% absorption in the 8-15 μm wavelength range. It has wide incident angle and polarization tolerances, making it promising for practical applications such as infrared camouflage.
Broadband long-wavelength infrared (LWIR) optical absorbers have important applications in thermal emission and imaging, infrared camouflaging, and waste heat and biothermal energy utilization. However, the practical application of broadband LWIR optical absorbers requires low-cost and facile fabrication of large-area structures with limited thickness. This paper reports the design and fabrication of an ultrathin, broadband, omnidirectional, and polarization-independent LWIR optical absorber composed of anodized aluminum oxide and highly doped Si using the gradient refractive index strategy. The average absorption of the broadband optical absorber is higher than 95% in the 8-15 mu m wavelength range, and it has wide incident angle and polarization tolerances. More than 95% of the optical energy in the wavelength range from 8 to 13 mu m was absorbed within a depth of 8 mu m, making this absorber the thinnest broadband LWIR dielectric absorber so far. The absorption remained above 90% after annealing at 800 degrees C in air. The infrared camouflage of the proposed absorber was successfully demonstrated with a human body background. With the advantages of facile fabrication, low-cost materials, restricted absorption thickness, and excellent thermal stability, the developed broadband LWIR optical absorber is very promising for the practical applications mentioned above.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available