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Ultralow-loss geometric phase and polarization shaping by ultrafast laser writing in silica glass

Ultralow-loss geometric phase and polarization shaping by ultrafast laser writing in silica glass
Ultralow-loss geometric phase and polarization shaping by ultrafast laser writing in silica glass

Polarization and geometric phase shaping via a space-variant anisotropy has attracted considerable interest for fabrication of flat optical elements and generation of vector beams with applications in various areas of science and technology. Among the methods for anisotropy patterning, imprinting of self-assembled nanograting structures in silica glass by femtosecond laser writing is promising for the fabrication of space-variant birefringent optics with high thermal and chemical durability and high optical damage threshold. However, a drawback is the optical loss due to the light scattering by nanograting structures, which has limited the application. Here, we report a new type of ultrafast laser-induced modification in silica glass, which consists of randomly distributed nanopores elongated in the direction perpendicular to the polarization, providing controllable birefringent structures with transmittance as high as 99% in the visible and near-infrared ranges and >90% in the UV range down to 330 nm. The observed anisotropic nanoporous silica structures are fundamentally different from the femtosecond laser-induced nanogratings and conventional nanoporous silica. A mechanism of nanocavitation via interstitial oxygen generation mediated by multiphoton and avanlanche defect ionization is proposed. We demonstrate ultralow-loss geometrical phase optical elements, including geometrical phase prism and lens, and a vector beam convertor in silica glass.

2095-5545
1-10
Sakakura, Masaaki
3bb15bbd-d590-4cba-ab5a-862dc7acd054
Lei, Yuhao
347ba758-df03-47b6-baed-3a58285173f7
Wang, Lei
c58bd3ee-ad0c-4829-9365-ef13fad13361
Yu, Yanhao
a46f1df6-fa8f-475c-b1aa-b98205266f6c
Kazansky, Peter
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Sakakura, Masaaki
3bb15bbd-d590-4cba-ab5a-862dc7acd054
Lei, Yuhao
347ba758-df03-47b6-baed-3a58285173f7
Wang, Lei
c58bd3ee-ad0c-4829-9365-ef13fad13361
Yu, Yanhao
a46f1df6-fa8f-475c-b1aa-b98205266f6c
Kazansky, Peter
a5d123ec-8ea8-408c-8963-4a6d921fd76c

Sakakura, Masaaki, Lei, Yuhao, Wang, Lei, Yu, Yanhao and Kazansky, Peter (2020) Ultralow-loss geometric phase and polarization shaping by ultrafast laser writing in silica glass. Light: Science & Applications, 9 (1), 1-10, [15]. (doi:10.1038/s41377-020-0250-y).

Record type: Article

Abstract

Polarization and geometric phase shaping via a space-variant anisotropy has attracted considerable interest for fabrication of flat optical elements and generation of vector beams with applications in various areas of science and technology. Among the methods for anisotropy patterning, imprinting of self-assembled nanograting structures in silica glass by femtosecond laser writing is promising for the fabrication of space-variant birefringent optics with high thermal and chemical durability and high optical damage threshold. However, a drawback is the optical loss due to the light scattering by nanograting structures, which has limited the application. Here, we report a new type of ultrafast laser-induced modification in silica glass, which consists of randomly distributed nanopores elongated in the direction perpendicular to the polarization, providing controllable birefringent structures with transmittance as high as 99% in the visible and near-infrared ranges and >90% in the UV range down to 330 nm. The observed anisotropic nanoporous silica structures are fundamentally different from the femtosecond laser-induced nanogratings and conventional nanoporous silica. A mechanism of nanocavitation via interstitial oxygen generation mediated by multiphoton and avanlanche defect ionization is proposed. We demonstrate ultralow-loss geometrical phase optical elements, including geometrical phase prism and lens, and a vector beam convertor in silica glass.

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More information

Accepted/In Press date: 14 January 2020
e-pub ahead of print date: 4 February 2020
Published date: 1 December 2020

Identifiers

Local EPrints ID: 436877
URI: http://eprints.soton.ac.uk/id/eprint/436877
ISSN: 2095-5545
PURE UUID: 9579044a-6d62-4c2d-bf0e-6354cac27851

Catalogue record

Date deposited: 13 Jan 2020 17:31
Last modified: 15 Feb 2021 17:34

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Contributors

Author: Masaaki Sakakura
Author: Yuhao Lei
Author: Lei Wang
Author: Yanhao Yu
Author: Peter Kazansky

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