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Optical and THz investigations of mid-IR materials exposed to alpha particle irradiation

The paper is the first comprehensive study on alpha particle irradiation effects on four mid-IR materials: CaF(2), BaF(2), Al(2)O(3) (sapphire) and ZnSe. The measurements of the optical spectral transmittance, spectral diffuse reflectance, radioluminescent emission, terahertz (THz) spectral response...

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Detalles Bibliográficos
Autores principales: Sporea, Dan, Mihai, Laura, Sporea, Adelina, Vâţã, Ion
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5220343/
https://www.ncbi.nlm.nih.gov/pubmed/28067289
http://dx.doi.org/10.1038/srep40209
Descripción
Sumario:The paper is the first comprehensive study on alpha particle irradiation effects on four mid-IR materials: CaF(2), BaF(2), Al(2)O(3) (sapphire) and ZnSe. The measurements of the optical spectral transmittance, spectral diffuse reflectance, radioluminescent emission, terahertz (THz) spectral response, transmittance, absorbance, refractive index, real and imaginary parts of the dielectric constant and THz imaging are used as complementary investigations to evaluate these effects. The simulations were run to estimate: (i) the penetration depth, (ii) the scattering of alpha particle beam, (iii) the amount of material affected by this interaction, and (iv) the number of vacancies produced by the radiation exposure for each type of material. The simulation results are compared to the off-line measurement outcomes. The delay and spectral composition change of the reflected THz signal highlight the modification induced in the tested materials by the irradiation process.