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Geometric phase circular gratings fabricated by ultrafast laser nanostructuring for symmetric simultaneous spatio-temporal focusing

Geometric phase circular gratings fabricated by ultrafast laser nanostructuring for symmetric simultaneous spatio-temporal focusing
Geometric phase circular gratings fabricated by ultrafast laser nanostructuring for symmetric simultaneous spatio-temporal focusing
The recent advances in flat optics have challenged the limitations of conventional optics by implementing planar elements that instead of rely on dynamic phase manipulate light waves via subwavelength-spaced phase shifters with spatially varying phase response [1]. One of the approaches for designing geometric (Pancharatnam-Berry phase [2]) phase optical elements (GPOE) is to exploit the transparent dielectrics which originate form birefringence. The desired phase pattern of the wave is directly encoded in the optical axis orientation, and is equal to twice the rotation angle of the local retarder. A decade ago, the formation of self-organized subwavelength periodicity structures, referred to as nanogratings, in the bulk of silica glass after irradiation with ultrashort light pulses was observed [3]. Such a periodic assembly behaves as a uniaxial birefringent material with optical axis oriented parallel to the polarization of incident laser beam, and serves as a perfect candidate for designing geometric phase profiles of nearly any optical components. The performance of fabricated GPOE varies depending on the processing conditions reaching the efficiency and transmittance higher than 90%, as well as the phase gradient higher than πrad/µm [4]. The silica glass based optics with a damage threshold of 22.8 J/cm2 demonstrate the potential of high-power applications. &more...
Drevinskas, Rokas
23f858b5-8750-4113-ba11-49cfefc3dbb7
Patel, Aabid
19aacdf5-c01e-4122-94b6-a29c10485952
Čerkauskaite, Aušra
7f5b1e7a-b9f9-41d2-ab4d-307a46605e43
Durfee, Charles G.
a547df9a-76e1-4a5f-908f-0e7ea172367b
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Drevinskas, Rokas
23f858b5-8750-4113-ba11-49cfefc3dbb7
Patel, Aabid
19aacdf5-c01e-4122-94b6-a29c10485952
Čerkauskaite, Aušra
7f5b1e7a-b9f9-41d2-ab4d-307a46605e43
Durfee, Charles G.
a547df9a-76e1-4a5f-908f-0e7ea172367b
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c

Drevinskas, Rokas, Patel, Aabid, Čerkauskaite, Aušra, Durfee, Charles G. and Kazansky, Peter G. (2017) Geometric phase circular gratings fabricated by ultrafast laser nanostructuring for symmetric simultaneous spatio-temporal focusing. 2017 Conference on lasers and electro-optics and European Quantum Electronics conference, , Munich, Germany. 25 - 29 Jun 2017. (In Press)

Record type: Conference or Workshop Item (Paper)

Abstract

The recent advances in flat optics have challenged the limitations of conventional optics by implementing planar elements that instead of rely on dynamic phase manipulate light waves via subwavelength-spaced phase shifters with spatially varying phase response [1]. One of the approaches for designing geometric (Pancharatnam-Berry phase [2]) phase optical elements (GPOE) is to exploit the transparent dielectrics which originate form birefringence. The desired phase pattern of the wave is directly encoded in the optical axis orientation, and is equal to twice the rotation angle of the local retarder. A decade ago, the formation of self-organized subwavelength periodicity structures, referred to as nanogratings, in the bulk of silica glass after irradiation with ultrashort light pulses was observed [3]. Such a periodic assembly behaves as a uniaxial birefringent material with optical axis oriented parallel to the polarization of incident laser beam, and serves as a perfect candidate for designing geometric phase profiles of nearly any optical components. The performance of fabricated GPOE varies depending on the processing conditions reaching the efficiency and transmittance higher than 90%, as well as the phase gradient higher than πrad/µm [4]. The silica glass based optics with a damage threshold of 22.8 J/cm2 demonstrate the potential of high-power applications. &more...

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Geometric Phase Circular Gratings Fabricated by Ultrafast Laser - Accepted Manuscript
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More information

Accepted/In Press date: 23 March 2017
Venue - Dates: 2017 Conference on lasers and electro-optics and European Quantum Electronics conference, , Munich, Germany, 2017-06-25 - 2017-06-29
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 409785
URI: http://eprints.soton.ac.uk/id/eprint/409785
PURE UUID: cce899af-fd13-447e-91d6-030e22625f76
ORCID for Aabid Patel: ORCID iD orcid.org/0000-0001-9902-5192
ORCID for Aušra Čerkauskaite: ORCID iD orcid.org/0000-0002-2476-7797

Catalogue record

Date deposited: 01 Jun 2017 04:08
Last modified: 30 Oct 2020 05:01

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