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

Autor(es)

Batista, Andre Jaques ^[1] ; Vianna, Pilar Gregory ^[2] ; Ribeiro, Henrique Bucker ^[2] ; Santiago de Matos, Christiano Jose ^[2] ; Leonidas Gomes, Anderson Stevens ^[3]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 9, JUN 20 2019.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 15/11779-4 - Efeitos plasmônicos e não-lineares em grafeno acoplado a guias de onda ópticos
• Beneficiário: Christiano José Santiago de Matos
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/20100-0 - Espectroscopia de efeitos excitônicos e multi-corpos em materiais bidimensionais
• Beneficiário: Henrique Bücker Ribeiro
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/12446-4 - Automação e controle por software de experimentos para ablação laser de grafeno
• Beneficiário: Pilar Gregory Vianna
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
• Beneficiário: Antonio Helio de Castro Neto
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC