Optical properties of high-quality oxide coating materials used in gravitational-wave advanced detectors
| Autor: | Lorenzo Mereni, L. Pinard, D. Forest, Benoit Sassolas, Gianluca Gemme, S. Terreni, M. Granata, Gianpietro Cagnoli, Vincent Dolique, Anthony A. Amato, Christophe Michel, Maurizio Canepa, Julien Teillon |
|---|---|
| Přispěvatelé: | Laboratoire des matériaux avancés (LMA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universita degli studi di Genova, Istituto Nazionale di Fisica Nucleare, Sezione di Genova (INFN, Sezione di Genova), Istituto Nazionale di Fisica Nucleare (INFN), Spectroscopies optiques des matériaux verres, amorphes et à nanoparticules (SOPRANO), Institut Lumière Matière [Villeurbanne] (ILM), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Oxide coatings engineering.material 01 natural sciences spectroscopic ellipsometry chemistry.chemical_compound Coating 0103 physical sciences Astronomical interferometer General Materials Science KAGRA 010306 general physics 010308 nuclear & particles physics business.industry Doping Condensed Matter Physics Atomic and Molecular Physics and Optics amorphous solids Amorphous solid spectroscopic ellipsometry amorphous solids oxides Urbach energy gravitational waves coatings Wavelength chemistry gravitational waves Urbach energy oxides engineering [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Optoelectronics business Refractive index |
| Zdroj: | Journal of Physics: Materials Journal of Physics: Materials, IOP Science, 2019, 2 (3), pp.035004. ⟨10.1088/2515-7639/ab206e⟩ |
| ISSN: | 2515-7639 |
| DOI: | 10.1088/2515-7639/ab206e⟩ |
| Popis: | High-reflection interference mirrors for current gravitational wave detectors (aLIGO, Advanced Virgo, KAGRA) are made of high-quality oxide multi-layers deposited by ion beam sputtering (IBS) at the Laboratoire des Matériaux Avancés (LMA). For this task, LMA uses a large IBS custom-made machine (the grand coater GC) able to deposit very uniform coatings over very large surfaces, with diameter of some tens of cm. We report for the first time about the optical characterization by spectroscopic ellipsometry of oxide coatings deposited by the GC under strictly the same conditions used for the production of interference mirrors. We have investigated oxide materials like silica (SiO2), tantala (Ta2O5) and titania-doped tantala (Ti:Ta2O5), providing for each material a broad-band (190–1700 nm) accurate determination of the complex index of refraction, with particular attention to wavelengths used in interferometers. Particular focus has been dedicated to the influence of Ti-doping on tantala coating. The doping induces a red-shift of the optical gap and an increase of the NIR refractive index. Furthermore, doping induces a decrease of the so-called Urbach energy, consistent with the well-known reduction of the internal friction in these kind of systems. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|