Scientific Results

Refractive index variation in a free-standing diamond thin film induced by irradiation with fully transmitted high-energy protons

Year: 2017

Authors: Lagomarsino S., Calusi S., Massi M., Gelli N., Sciortino S., Taccetti F., Giuntini L., Sordini A., Vannoni M., Bosia F., Gatto Monticone D., Olivero P., Fairchild B.A., Kashyap P., Alves A.D.C., Strack M.A., Prawer S., Greentree A.D.

Autors Affiliation: Department of Physics and Astronomy, University of Firenze, Italy; Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Firenze, Italy; Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Firenze, Italy; Istituto Nazionale di Ottica (CNR), Firenze, Italy; Physics Department and NIS Inter-departmental Centre, University of Torino, Italy; Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Torino, Italy; Consorzio Nazionale Interuniversitario per le Scienze fisiche della Materia (CNISM), Sezione di Torino, Italy; School of Physics, University of Melbourne Australia; Australian Research Council Centre of Excellence for Nanoscale BioPhotonics, RMIT University, Melbourne, 3001, Australia

Abstract: Ion irradiation is a widely employed tool to fabricate diamond micro- and nano-structures for applications in integrated photonics and quantum optics. In this context, it is essential to accurately assess the effect of ion-induced damage on the variation of the refractive index of the material, both to control the side effects in the fabrication process and possibly finely tune such variations. Several partially contradictory accounts have been provided on the effect of the ion irradiation on the refractive index of single crystal diamond. These discrepancies may be attributable to the fact that in all cases the ions are implanted in the bulk of the material, thus inducing a series of concurrent effects (volume expansion, stress, doping, etc.). Here we report the systematic characterization of the refractive index variations occurring in a 38 mu m thin artificial diamond sample upon irradiation with high-energy (3 MeV and 5 MeV) protons. In this configuration the ions are fully transmitted through the sample, while inducing an almost uniform damage profile with depth. Therefore, our findings conclusively identify and accurately quantify the change in the material polarizability as a function of ion beam damage as the primary cause for the modification of its refractive index.

Journal/Review: SCIENTIFIC REPORTS

Volume: 7      Pages from: 385-1  to: 385-8

More Information: This activity was supported by the following projects, which are gratefully acknowledged: FIRB \”Future in Research 2010\” project (CUP code: D11J11000450001) funded by the Italian Ministry for Teaching, University and Research (MIUR); \”FARE\” project funded by the Italian National institute of Nuclear Physics (INFN); \”A.Di.N-Tech.\” project (CUP code: D15E13000130003) funded by University of Torino and Compagnia di San Paolo in the framework of the \”Progetti di ricerca di Ateneo 2012\” scheme. A.D.G. acknowledges the ARC for financial support (Grant No. DP130104381).
DOI: 10.1038/s41598-017-00343-0

Citations: 3
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English