Void-nanograting transition by ultrashort laser pulse irradiation in silica glass
Void-nanograting transition by ultrashort laser pulse irradiation in silica glass
The structural evolution from void modification to self-assembled nanogratings in fused silica is observed for moderate (NA > 0.4) focusing conditions. Void formation, appears before the geometrical focus after the initial few pulses and after subsequent irradiation, nanogratings gradually occur at the top of the induced structures. Nonlinear Schrödinger equation based simulations are conducted to simulate the laser fluence, intensity and electron density in the regions of modification. Comparing the experiment with simulations, the voids form due to cavitation in the regions where electron density exceeds 1020 cm-3 but is below critical. In this scenario, the energy absorption is insufficient to reach the critical electron density that was once assumed to occur in the regime of void formation and nanogratings, shedding light on the potential formation mechanism of nanogratings.
19344-19353
Dai, Ye
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Patel, Aabid
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Song, Juan
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Beresna, Martynas
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Kazansky, Peter G.
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11 August 2016
Dai, Ye
5b53b9dd-be8d-46a6-b6c7-0842da523d31
Patel, Aabid
19aacdf5-c01e-4122-94b6-a29c10485952
Song, Juan
dc482b80-3272-47a9-bb34-a70a7b4479ec
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Dai, Ye, Patel, Aabid, Song, Juan, Beresna, Martynas and Kazansky, Peter G.
(2016)
Void-nanograting transition by ultrashort laser pulse irradiation in silica glass.
Optics Express, 24 (17), .
(doi:10.1364/OE.24.019344).
Abstract
The structural evolution from void modification to self-assembled nanogratings in fused silica is observed for moderate (NA > 0.4) focusing conditions. Void formation, appears before the geometrical focus after the initial few pulses and after subsequent irradiation, nanogratings gradually occur at the top of the induced structures. Nonlinear Schrödinger equation based simulations are conducted to simulate the laser fluence, intensity and electron density in the regions of modification. Comparing the experiment with simulations, the voids form due to cavitation in the regions where electron density exceeds 1020 cm-3 but is below critical. In this scenario, the energy absorption is insufficient to reach the critical electron density that was once assumed to occur in the regime of void formation and nanogratings, shedding light on the potential formation mechanism of nanogratings.
Text
Final Void Publication.pdf
- Accepted Manuscript
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Accepted/In Press date: 4 August 2016
e-pub ahead of print date: 11 August 2016
Published date: 11 August 2016
Organisations:
Optoelectronics Research Centre
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Local EPrints ID: 399255
URI: http://eprints.soton.ac.uk/id/eprint/399255
ISSN: 1094-4087
PURE UUID: 7afdcbbd-b6ca-46da-9922-dd6a3e22468c
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Date deposited: 15 Aug 2016 07:52
Last modified: 15 Mar 2024 01:48
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Author:
Ye Dai
Author:
Aabid Patel
Author:
Juan Song
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