Parity violation in chiral structure creation under femtosecond laser irradiation in silica glass?

Poumellec, Bertrand; Lancry, Matthieu; Desmarchelier, Rudy; Hervé, Evelyne; Bourguignon, Bernard

doi:10.1038/lsa.2016.178

Cited by 30 publications

(16 citation statements)

References 43 publications

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“…Furthermore, we also observed that the 3D rotation of nanograting only occurs in one scan direction, while it disappears in the reversed scan direction; the result is thought to be another type of quill writing effect [22]. Most recently, Poumellec et al suggested that the non-reciprocal writing effect can create a chiral structure in an achiral material (namely, pure silica glass), which reveals a new parity violation arising from the chirality of current ultrafast laser processing systems [23,24].…”

Section: Introductionmentioning

confidence: 72%

Femtosecond laser-induced structural difference in fused silica with a non-reciprocal writing process

et al. 2017

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ionization process is always induced at a very local regime, and therefore, a wide variety of microstructures can be achieved in three-dimensional (3D) space. This principle has been extensively applied in the fabrication of functional devices. For example, the formed nanovoid at the focus can be used for 3D optical memory [6]. Direct writing waveguide in glass is a promising candidate to design the architecture of quantum computation or communication [7]. In recent years, a kind of self-organized periodic nanostructure, referred to as nanograting, is attracting considerable attention due to its characteristics of local anisotropy and optical birefringence, which could be applied for optical data storage, microbiomedicine systems, and S-waveplate fabrication [8][9][10][11][12].Currently, the formation mechanism for self-organized nanogratings in glass is still under hot debate, but the anisotropy of nanograting depends on the polarization of the writing laser [8,[13][14][15]. However, Kazansky et al. observed an additional dependence of nanograting on the laser scan direction in 2007 [16]. According to their observations of the birefringence of the nanograting, simply reversing the scan direction can lead to an obvious intensity difference; this is non-reciprocal laser writing or the so-called quill effect. In addition, they suggest the presence of a pulse front tilt (PFT) as the main cause for such non-reciprocal writing because PFT can establish a tilted intensity plane across the focal spot, which acts to displace free electrons in the plasma by a pondermotive force. Therefore, an asymmetrical carrier motion and successive defect distribution form in the modification area lead to an anisotropic accumulation effect between the two sides of the written line [17,18]. Other groups further studied non-reciprocal ultrafast laser writing with spatiotemporal pulse shaping techniques to change the PFT. Vitek et al. discovered depthdependent non-reciprocal structures formed in irradiated Abstract In this paper, we report a non-reciprocal writing process for inducing asymmetric microstructure using a femtosecond laser with tilted pulse fronts in fused silica. The shape of the induced microstructure at the focus closely depends on the laser scan direction. An elongated end is observed as a kind of structural difference between the written lines with two reverse scans along +x and -x, which further leads to a birefringence intensity difference. We also find a bifurcation in the head region of the induced microstructure between the written lines along x and y. That process results from the focal intensity distortion caused by the pulse front tilt by comparing the simulated intensity distribution with the experimental results. The current results demonstrate that the pulse front tilt not only affects the free electron excitation at the focus but also further distorts the shape of the induced microstructure during a high-energy femtosecond laser irradiation. These results offer a route to fabricate optical elements by changin...

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Section: Introductionmentioning

confidence: 72%

Femtosecond laser-induced structural difference in fused silica with a non-reciprocal writing process

et al. 2017

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“…Des travaux récents établissent qu'un faisceau laser femtoseconde polarisé linéairement et focalisé dans un verre sous une géométrie axialement symétrique est capable de briser la symétrie chirale [5]. Ici, le verre de silice SiO 2 est achiral, mais l'irradiation laser femtoseconde donne lieu à une propriété optique chirale : un pouvoir rotatoire pouvant atteindre plusieurs centaines de degrés par mm, ainsi que du dichroïsme circulaire.…”

Section: Et Même L'impression D'une Chiralité Optiqueunclassified

Fonctionnaliser le verre pour de nouvelles propriétés optiques

Cardinal

Lancry²,

Canioni³

et al. 2022

Reflets phys.

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Si le verre possède de nombreux atouts, ses propriétés optiques sont parmi les plus remarquables. Sa transparence et son indice de réfraction ont longtemps été reliés exclusivement à sa composition globale. Cependant, la structuration des propriétés optiques en surface ou au coeur du verre, à l’échelle micro ou nanométrique, connait un engouement particulier ces dernières années. Nous nous intéressons dans cet article à la structuration multidimensionnelle des verres par des impulsions lasers ultracourtes ou par l’insertion de nanoparticules au sein de fibres optiques. Cette approche mène à de nouvelles applications en photonique, mais aussi en optofluidique, optomécanique, micromoulage d’optiques ou encore pour le stockage optique pérenne d’informations.

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“…Thirdly, at an intermediate energy range, structures with modulated oxygen concentration form [17]. If the fabrication laser polarization is linear and several hundred laser pulses per spot irradiate the material, strongly birefringent self-assembled nanogratings develop out of these structures [17][18][19][20][21][22][23][24]. The nanogratings are known to align perpendicular to the writing laser polarization with a period p nano ≈ λ w /(2n).…”

Section: Introductionmentioning

confidence: 99%

Embedded nanograting-based waveplates for polarization control in integrated photonic circuits

Lammers¹,

Ehrhardt²,

Malendevych³

et al. 2019

Opt. Mater. Express

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Parity violation in chiral structure creation under femtosecond laser irradiation in silica glass?

Cited by 30 publications

References 43 publications

Femtosecond laser-induced structural difference in fused silica with a non-reciprocal writing process

Femtosecond laser-induced structural difference in fused silica with a non-reciprocal writing process

Fonctionnaliser le verre pour de nouvelles propriétés optiques

Embedded nanograting-based waveplates for polarization control in integrated photonic circuits

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