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10.3390/ma19132810
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Article

Enhancing Quartz Infrared Absorption by Tuning Femtosecond Laser Surface Texturing Patterns

by
Isabella Petruzzellis
1,
Raffaele De Palo
2,*,
Andrea Zifarelli
3,
Pietro Patimisco
3,4,
Felice Alberto Sfregola
3,5,
Stefania Caragnano
3,5,
Caterina Gaudiuso
5,
Francesco Paolo Mezzapesa
5,
Vincenzo Spagnolo
2,4,
Antonio Ancona
3,5 and
Annalisa Volpe
2,5
1
Chemistry Department, Università degli Studi di Bari, Via Orabona 4, 70126 Bari, Italy
2
Physics Department, Politecnico di Bari, Via Amendola 173, 70125 Bari, Italy
3
Physics Department, Università degli Studi di Bari, Via Amendola 173, 70125 Bari, Italy
4
PolySense Innovations srl, Via Amendola 173, 70125 Bari, Italy
5
Institute for Photonics and Nanotechnologies (IFN), National Research Council, Via Amendola 173, 70125 Bari, Italy
*
Author to whom correspondence should be addressed.
Materials 2026, 19(13), 2810; https://doi.org/10.3390/ma19132810
Submission received: 29 May 2026 / Revised: 22 June 2026 / Accepted: 30 June 2026 / Published: 2 July 2026
(This article belongs to the Special Issue Advances in Laser Processing Technology of Materials—Second Edition)
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Abstract

Quartz is widely employed in optoelectronic and sensing applications owing to its excellent mechanical and chemical properties. However, its intrinsic transparency up to 5 μm limits its direct use as a photodetection substrate across the near- and mid-infrared spectral regions. Laser surface texturing for the fabrication of the so-called black quartz represents a promising strategy to overcome this limitation. In this work, different femtosecond (fs) laser texturing strategies were investigated on a 1 mm thick α-quartz wafer, namely uniform milling, grid-patterned grooves, and localized arrays of ablated craters. The fs-laser-treated quartz samples showed a transmittance reduction of up to 60% within the quartz transparency window in the infrared range, with crater matrices providing the most effective blackening performance. The enhanced absorption was attributed to light-trapping effects induced by the tapered crater geometry, which promotes multiple internal reflections and increased optical confinement within the substrate. The proposed strategy demonstrates a reliable, maskless, and chemical-free surface functionalization strategy for the fabrication of quartz-based substrates for broadband infrared photodetection in sensing applications.
Keywords: quartz; femtosecond laser; blackening quartz; femtosecond laser; blackening
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MDPI and ACS Style

Petruzzellis, I.; De Palo, R.; Zifarelli, A.; Patimisco, P.; Sfregola, F.A.; Caragnano, S.; Gaudiuso, C.; Mezzapesa, F.P.; Spagnolo, V.; Ancona, A.; et al. Enhancing Quartz Infrared Absorption by Tuning Femtosecond Laser Surface Texturing Patterns. Materials 2026, 19, 2810. https://doi.org/10.3390/ma19132810

AMA Style

Petruzzellis I, De Palo R, Zifarelli A, Patimisco P, Sfregola FA, Caragnano S, Gaudiuso C, Mezzapesa FP, Spagnolo V, Ancona A, et al. Enhancing Quartz Infrared Absorption by Tuning Femtosecond Laser Surface Texturing Patterns. Materials. 2026; 19(13):2810. https://doi.org/10.3390/ma19132810

Chicago/Turabian Style

Petruzzellis, Isabella, Raffaele De Palo, Andrea Zifarelli, Pietro Patimisco, Felice Alberto Sfregola, Stefania Caragnano, Caterina Gaudiuso, Francesco Paolo Mezzapesa, Vincenzo Spagnolo, Antonio Ancona, and et al. 2026. "Enhancing Quartz Infrared Absorption by Tuning Femtosecond Laser Surface Texturing Patterns" Materials 19, no. 13: 2810. https://doi.org/10.3390/ma19132810

APA Style

Petruzzellis, I., De Palo, R., Zifarelli, A., Patimisco, P., Sfregola, F. A., Caragnano, S., Gaudiuso, C., Mezzapesa, F. P., Spagnolo, V., Ancona, A., & Volpe, A. (2026). Enhancing Quartz Infrared Absorption by Tuning Femtosecond Laser Surface Texturing Patterns. Materials, 19(13), 2810. https://doi.org/10.3390/ma19132810

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