Journal
APPLIED OPTICS
Volume 59, Issue 14, Pages 4507-4516Publisher
Optica Publishing Group
DOI: 10.1364/AO.390751
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Funding
- Department of Science and Technology
- Government of India [EMR/2016/006235]
- Indian Space Research Organisation (ISRO)
- Council of Scientific and IndustrialResearch, India [09/092(0954)-EMR-I]
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The optical properties (reflectivity, transmissivity, and absorptivity) of metallic thin films (MTFs) of copper, silver, gold, and aluminum upon irradiation by low-energy (similar to 0.5 keV) inert gaseous argon (Ar+) ion beams are investigated using UV-VIS-NIR spectrophotometry. The optical constants (real and imaginary parts of the refractive index) of both pristine as well as irradiated MTFs are measured by employing the pseudo-Brewster angle technique. The implanted low-energy Ar+ ions modify the dielectric constant of pure MTFs, which in turn changes the refractive index and therefore alters the optical properties of MTFs. Results indicate that the reflectivity decreases, whereas the transmissivity increases with Ar+ ion fluence. Absorptivity, calculated using the energy conservation law, increases with ion fluence. The optical modification of MTFs is discussed in light of Maxwell-Garnett theory, and possible applications are outlined. (C) 2020 Optical Society of America
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