Femtosecond Laser Processing by Using Patterned Vector Optical Fields

Lou, Kai; Qian, Sheng-Xia; Ren, Zhi-Cheng; Tu, Chenghou; Li, Yongnan; Wang, Hui-Tian

doi:10.1038/srep02281

Cited by 58 publications

(22 citation statements)

References 22 publications

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“…The use of optical cylindrical vector beams with fs pulse duration has been demonstrated as a striking laser surface fabrication method for the generation of surface patterns with axial symmetry (e.g., azimuthal, radial, spiral, etc.) 11 12 13 14 15 16 , thanks to their numerous spatially variant SoP 17 . Moreover, the direct relationship of surface structures orientation and morphological features with laser light polarization and fluence has also been demonstrated as an effective, direct way for the characterization of intense optical vector beams 18 19 20 21 .…”

mentioning

confidence: 99%

Surface Structuring with Polarization-Singular Femtosecond Laser Beams Generated by a q-plate

Nivas

Cardano²,

Song

et al. 2017

Sci Rep

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In the last few years femtosecond optical vortex beams with different spatial distributions of the state of polarization (e.g. azimuthal, radial, spiral, etc.) have been used to generate complex, regular surface patterns on different materials. Here we present an experimental investigation on direct femtosecond laser surface structuring based on a larger class of vector beams generated by means of a q-plate with topological charge q = +1/2. In fact, voltage tuning of q-plate optical retardation allows generating a family of ultrashort laser beams with a continuous spatial evolution of polarization and fluence distribution in the focal plane. These beams can be thought of as a controlled coherent superposition of a Gaussian beam with uniform polarization and a vortex beam with a radial or azimuthal state of polarization. The use of this family of ultrashort laser beams in surface structuring leads to a further extension of the achievable surface patterns. The comparison of theoretical predictions of the vector beam characteristics at the focal plane and the generated surface patterns is used to rationalize the dependence of the surface structures on the local state of the laser beam, thus offering an effective way to either design unconventional surface structures or diagnose complex ultrashort laser beams.

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confidence: 99%

Surface Structuring with Polarization-Singular Femtosecond Laser Beams Generated by a q-plate

Nivas

Cardano²,

Song

et al. 2017

Sci Rep

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“…Complex polarization patterns in a single laser beam can offer the possibility of generating complex surface structures. Polarization is an intrinsic and key element of light and the use of laser beams with a spatially inhomogeneous state of polarization (SoP) is bringing out novel breakthroughs on the horizon of fs laser material processing 8 9 . The possibility to use vector optical fields to directly fabricate surface microstructures is emerging as a fascinating possibility and is proposed as an effective method for vector beams characterization 10 11 12 as well as for unconventional surface structuring 13 14 15 16 .…”

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confidence: 99%

Direct Femtosecond Laser Surface Structuring with Optical Vortex Beams Generated by a q-plate

Nivas

Rubano

et al. 2015

Sci Rep

131

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Creation of patterns and structures on surfaces at the micro- and nano-scale is a field of growing interest. Direct femtosecond laser surface structuring with a Gaussian-like beam intensity profile has already distinguished itself as a versatile method to fabricate surface structures on metals and semiconductors. Here we present an approach for direct femtosecond laser surface structuring based on optical vortex beams with different spatial distributions of the state of polarization, which are easily generated by means of a q-plate. The different states of an optical vortex beam carrying an orbital angular momentum ℓ = ±1 are used to demonstrate the fabrication of various regular surface patterns on silicon. The spatial features of the regular rippled and grooved surface structures are correlated with the state of polarization of the optical vortex beam. Moreover, scattered surface wave theory approach is used to rationalize the dependence of the surface structures on the local state of the laser beam characteristics (polarization and fluence). The present approach can be further extended to fabricate even more complex and unconventional surface structures by exploiting the possibilities offered by femtosecond optical vector fields.

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“…The introduction of NUTP beams has been followed by their use in numerous application fields, such as optical tweezers, particle optical manipulation, material processing, microscopy, focus shaping, surface plasmon sensing, polarimetry, etc. [10,12,13,25,44,[52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of non-uniformly totally polarized light beams: tutorial

Piquero¹,

Martı́nez-Herrero²,

Sande³

et al. 2020

J. Opt. Soc. Am. A

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Polarization of a light beam is traditionally studied under the hypothesis that the state of polarization is uniform across the transverse section of the beam. In such a case, if the paraxial approximation is also assumed, the propagation of the beam reduces to a scalar problem. Over the last few decades, light beams with spatially variant states of polarization have attracted great attention, due mainly to their potential use in applications such as optical trapping, laser machining, nanoscale imaging, polarimetry, etc. In this tutorial, an introductory treatment of nonuniformly totally polarized beams is given. Besides a brief review of some useful parameters for characterizing the polarization distribution of such beams across transverse planes, from both local and global points of view, several methods for generating them are described. It is expected that this tutorial will serve newcomers as a starting point for further studies on the subject.

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Femtosecond Laser Processing by Using Patterned Vector Optical Fields

Cited by 58 publications

References 22 publications

Surface Structuring with Polarization-Singular Femtosecond Laser Beams Generated by a q-plate

Surface Structuring with Polarization-Singular Femtosecond Laser Beams Generated by a q-plate

Direct Femtosecond Laser Surface Structuring with Optical Vortex Beams Generated by a q-plate

Synthesis and characterization of non-uniformly totally polarized light beams: tutorial

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