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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

QR code micro-certified gemstones: femtosecond writing and Raman characterization in Diamond, Ruby and Sapphire

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Batista, Andre Jaques [1] ; Vianna, Pilar Gregory [2] ; Ribeiro, Henrique Bucker [2] ; Santiago de Matos, Christiano Jose [2] ; Leonidas Gomes, Anderson Stevens [3]
Total Authors: 5
[1] Univ Fed Pernambuco, Mineral Engn Dept, Recife, PE - Brazil
[2] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, BR-01302907 Sao Paulo - Brazil
[3] Univ Fed Pernambuco, Phys Dept, BR-50670901 Recife, PE - Brazil
Total Affiliations: 3
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 9, JUN 20 2019.
Web of Science Citations: 1

This paper reports on a micro-certification procedure using femtosecond laser irradiation to microscopically mark a single-crystalline gemological and natural diamond, synthetic ruby and synthetic sapphire, inscribing a QR Code on them. The QR-code was composed of a set of 25 x 25 micropoints, and the irradiation energy was optimized at 1kHz repetition rate. The code was made at a 20 mu m relative depth into the gemstone surfaces by controlling the incident laser energy, that was set to 3 mu J for all the samples. Characterization by optical and electron microscopy, as well as micro-Raman hyperspectral imaging showed that the microdots have a diameter of about 14 mu m perpendicular to the irradiation direction, being laterally spaced by 14 mu m-18 mu m applied for each sample. This work corroborates the feasibility of using ultrafast laser inscription technology to fabricate microdots with great quality on gemstone surfaces, which offers a great potential for the jewelry industry to safely micro-encrypt gemological certifications. The compositional and morphological characterization of the modified surface was carried by micro-Raman spectroscopy and scanning electron microscopy. (AU)

FAPESP's process: 15/11779-4 - Plasmonic and nonlinear effects in graphene coupled to optical waveguides
Grantee:Christiano José Santiago de Matos
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
Grantee:Antonio Helio de Castro Neto
Support type: Research Projects - SPEC Program
FAPESP's process: 17/20100-0 - Spectroscopy of excitonic and many body effects in two-dimensional materials
Grantee:Henrique Bücker Ribeiro
Support type: Scholarships in Brazil - Post-Doctorate