The optical absorptance of a single graphene layer over wide range wavelengths is known to be remarkably constant at the universal value $\ensuremath{\pi}\ensuremath{\alpha}$ where $\ensuremath{\alpha}$ fine structure constant. Using atomistic tight-binding calculations, we show that spectra nanometer-thin layers (quantum wells) group-IV, III-V, II-VI, or IV-VI semiconductors are characterized ...

In this study, a thermal-balance model is established for energy calculation of new solar-fuel assisted thermophotovoltaic system, which could save fossil fuels and improve the grade solar energy. The coupling effects key parameters such as concentrate ratio, absorber area, emitter etc. on system efficiency are determined. Besides, effect fuel saving investigated. results show that can not only...

Mountain pastures dominated by the pasture grass Setaria sphacelata in the Andes of southern Ecuador are heavily infested by southern bracken (Pteridium arachnoideum), a major problem for pasture management. Field observations suggest that bracken might outcompete the grass due to its competitive strength with regard to the absorption of photosynthetically active radiation (PAR). To understand ...

A detailed theoretical investigation of one dimensional SiO2/TiO2 photonic crystal based ZnO-Pt dye sensitized solar cell with N719 is carried out. The optical properties the theoretically designed such as transmittance, absorptance and reflectance are calculated using transfer matrix method in order to calculate numerically key parameters like open circuit voltage (VOC), short current (Jsc) ef...

We study light absorption by weakly rough metal surfaces with the roughness amplitude and correlation length smaller than skin depth in metal. develop a systematic perturbative approach for calculation of absorptance such systems find that roughness-related variations are determined an interplay between several system parameters which can result, particular, greater amplitudes. show that, small...

Plasmonic structures based on stacked layers of metal and dielectric materials excel as broadband absorbers because the nonlinear relationship between compound materials’ dispersion characteristics multilayered structure’s actual performance. In this work, radiation absorption along plasmonic absorber is studied. Broadband absorptance spectra play an important role in applications such photovol...