Topic
Absorption (electromagnetic radiation)
About: Absorption (electromagnetic radiation) is a research topic. Over the lifetime, 76674 publications have been published within this topic receiving 1381221 citations.
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TL;DR: In this article, the general principle of wavelength-selective enhancement of absorption in thin-film solar cells by a periodic grating substrate was presented, and substantial short-circuit current gains were realizable in thinfilm amorphous silicon (a•SiHx) solar cells.
Abstract: We present the general principle of wavelength‐selective enhancement of absorption in thin‐film solar cells by a periodic grating substrate. By exact numerical calculation we demonstrate that substantial short‐circuit current gains are realizable in thin‐film amorphous silicon (a‐SiHx) solar cells. In particular, for a 0.5‐μm‐thick a‐SiHx solar cell, optimal texturing of an Ag substrate to form a one‐dimensional reflective grating can yield a 2‐mA/cm2 enhancement over the flat substrate case. For a two‐dimensional cross‐hatched grating substrate the enhancement is estimated to be 3.5–4 mA/cm2.
193 citations
TL;DR: The periodically patterned cross-shaped graphene arrays from far-infrared to THz region as wavelength tunable absorbers are investigated and the wavelength of absorption maximum shows angle independence for both TE and TM polarizations.
Abstract: We present a wavelength tunable absorber composed of periodically patterned cross-shaped graphene arrays in the far-infrared and THz regions The absorption of the single-layer array can essentially exceed the continuous graphene sheet by increasing the cross-arm width, even for small graphene filling ratio As chemical potential and relaxation time increase, the absorption can be significantly enhanced The complementary structure shows higher absorption compared to the original graphene array Moreover, the wavelength of absorption maximum is angle-insensitive for both TE and TM polarizations The absorption efficiency can be further improved with double layers of the cross-shaped graphene arrays, which are helpful to design dual-band and broadband absorbers
193 citations
TL;DR: This paper proposes a novel underwater imaging model that compensates for the attenuation discrepancy along the propagation path, and develops a robust color lines-based ambient light estimator and a locally adaptive filtering algorithm for enhancing underwater images in shallow oceans.
Abstract: Absorption, scattering, and color distortion are three major degradation factors in underwater optical imaging. Light rays are absorbed while passing through water, and absorption rates depend on the wavelength of the light. Scattering is caused by large suspended particles, which are always observed in an underwater environment. Color distortion occurs because the attenuation ratio is inversely proportional to the wavelength of light when light passes through a unit length in water. Consequently, underwater images are dark, low contrast, and dominated by a bluish tone. In this paper, we propose a novel underwater imaging model that compensates for the attenuation discrepancy along the propagation path. In addition, we develop a robust color lines-based ambient light estimator and a locally adaptive filtering algorithm for enhancing underwater images in shallow oceans. Furthermore, we propose a spectral characteristic-based color correction algorithm to recover the distorted color. The enhanced images have a reasonable noise level after the illumination compensation in the dark regions, and demonstrate an improved global contrast by which the finest details and edges are enhanced significantly.
192 citations
TL;DR: In this paper, the structural and electronic properties of CeO2 and Ce1-xZrxO2 nanoparticles were investigated using time-resolved X-ray diffraction, Xray absorption near-edge spectroscopy (XANES) and X-Ray absorption nearedge spectrograms.
Abstract: In this article the structural and electronic properties of CeO2 and Ce1-xZrxO2 nanoparticles are investigated using time-resolved X-ray diffraction, X-ray absorption near-edge spectroscopy (XANES)...
192 citations
TL;DR: In this article, Fe3O4@LAS/RGO composites with uniform size and extraordinary electromagnetic wave absorption properties were successfully synthesized by a simple three-step method.
192 citations