Madina Obaidullah, Volkan Esat, Cumali Sabah,
https://www.spiedigitallibrary.org/journals/Journal-of-Nanophotonics/volume-11/issue-4/046011/Polarization-independent-triple-band-54-semiconducting-carbon-nanotube-metamaterial-absorber/10.1117/1.JNP.11.046011.short?SSO=1
Various metamaterial absorber designs operating
in the microwave, infrared, visible, and ultraviolet frequency regions have
been proposed in the literature. However, only a few studies have been done on
the metamaterials that absorb in both visible and ultraviolet solar spectra. A
triple-band polarization-insensitive metamaterial absorber structure with
semiconducting single-walled carbon nanotube as the dielectric layer is
proposed to efficiently absorb the incident electromagnetic radiations in
visible and ultraviolet frequency regions. A unit cell of this design comprises
three basic components in the form of metal–semiconductor–metal layers. The
metallic part of the structure is aluminum, and the (5,4) single-walled carbon
nanotube is used as the semiconducting material. The electromagnetic response
of the proposed design is numerically simulated in the visible and ultraviolet
regions with the maximum absorption rates of 99.75% at 479.4 THz, 99.94%
at 766.9 THz, and 97.33% at 938.8 THz with corresponding skin depths
of 13.0, 12.8, and 12.9 nm, respectively. Thus, solar cells based on this
metamaterial absorber can offer nearly perfect absorption in the suggested
frequency regions. The simple configuration of the design provides flexibility
to control geometric parameters to be used in the solar cell and possesses the
capability to be rescaled for other solar spectrum.
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