منابع مشابه
Absorption and scattering in low-loss polymer optical waveguides
The absolute absorption spectra of low-loss optical waveguides, together with their intrinsic and extrinsic scatterings, were measured in the near infrared. Photothermal deflection spectroscopy was used to measure the full absorption spectra of a series of fluorinated cross-linked polymers. Assignment of —CH3, —CH2—, and —OH overtones as well as of combinations of overtones were made by use of ...
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In this work, the optical absorption near the fundamental absorption edge of co-evaporated Ce0 -V20 films is studied. It is found that the fundamental optical absorption in these materials is sharp more like that expected for crystals. It is also found that as the V O content increases, the edge becomes less sharp and shifts towards higher wavelengths
متن کاملOPTICAL ABSORPTION IN ZnSiP2
The polarised absorption coefficient of ZnSiP? near the fundamental absorption edge has been studied. Three singularities were found for E l c which are attributed to pseudodirect transitions. The absorption for El/ c is mainly due to indirect transitions. A theoretical curve was fitted to the experimental results with the aid of the relative theoretical intensities for pseudodirect transitions...
متن کاملThe anomalous optical absorption spectrum of low zircon
Further lines of the anomalous optical absorption spectrum in low metamict zircon have been observed in the infra-red. Low-temperature polarization studies have enabled a clear distinction to be made between lines due to the anomalous spectrum and those due to the normal spectrum of U ~in zircon. Magnetic circular dichroism measurements showed, for the anomalous spectrum, only contributions due...
متن کاملHigh optical absorption in graphene
A simple analysis is performed for the absorption properties of graphene sandwiched between two media. For a proper choice of media and graphene doping/gating one can approach 50-100% absorption in the GHz-THz range for the one atom thick material. This absorption is controlled by a characteristic chemical potential which depends only on carrier life-time and the indexes of refraction of the di...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 1972
ISSN: 0556-2805
DOI: 10.1103/physrevb.6.3620