期刊
ADVANCED OPTICAL MATERIALS
卷 4, 期 8, 页码 1265-1273出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201600236
关键词
optical metamaterials; solar thermal absorbers; tandem grating
资金
- Pioneer Research Center Program through National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2013M3C1A3063046]
- National Research Foundation of Korea [2013M3C1A3063597, 2013M3C1A3063598] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this work, a tandem grating solar absorber is proposed, which can be easily fabricated on a wafer scale and is thermally stable up to 800 K. The base of the solar thermal absorber consists of a tungsten substrate, SiO2 spacer, and 2D tungsten nanohole array filled with SiO2. On top of the base structure, a 2D tungsten nanodisc array is coated with an additional SiO2 spacer, forming the tandem grating structure. The outside area of the nanodisc array is also filled with SiO2; thus, the proposed solar absorber is geometrically flat. In the solar spectrum from 0.3 to 2.0 m, the total absorptance of the fabricated sample is measured to be 90%. On the other hand, in the mid-infrared region from 3 to 15 m, the total emittance is measured to be 23% at 800 K, which greatly suppresses the thermal emission loss. Finite-difference time-domain simulation suggests that the magnetic resonance and Rayleigh anomaly are responsible for the enhanced absorption of solar radiation. It is also shown that the spectral absorptance of the proposed solar absorber is nearly insensitive to the polarization angle as well as to the incidence angle in the spectrum of solar radiation.
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