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Effect of sodium addition and thermal annealing on second-order optical nonlinearity in thermally poled amorphous Ta2O5 thin films

Effect of sodium addition and thermal annealing on second-order optical nonlinearity in thermally poled amorphous Ta2O5 thin films
Effect of sodium addition and thermal annealing on second-order optical nonlinearity in thermally poled amorphous Ta2O5 thin films
We demonstrate second-order optical nonlinearity (SON) induced in amorphous tantalum pentoxide (Ta2O5) films by thermal poling. The effects of sodium addition and thermal annealing on the efficiency and stability of second harmonic generation (SHG) have been investigated. Maker fringe analysis has been used to quantify the poling-induced SON. χ(2) of 0.46 ± 0.02 pm/V and 0.34 ± 0.02  pm/V was achieved for sodium-containing and pure Ta2O5 films, respectively. Both the strength and the temporal stability of the induced nonlinearity are discussed with respect to the poling mechanisms and measured electrical conductivity. The lower density of uncombined charges of the Ta2O5 thin films is believed to play a role in the strength of SHG signal, and the rate of SHG decay decreases with thermal annealing.
0021-8979
Tong, Amy Sen Kay
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Bondu, Flavie
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Murugan, G. Senthil
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Wilkinson, James S.
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Dussauze, Marc
4710be1d-aaf7-4c05-8803-edc6597a80e7
Tong, Amy Sen Kay
cc6ac738-a365-4ea3-a979-67dd4fb7392a
Bondu, Flavie
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Murugan, G. Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Dussauze, Marc
4710be1d-aaf7-4c05-8803-edc6597a80e7

Tong, Amy Sen Kay, Bondu, Flavie, Murugan, G. Senthil, Wilkinson, James S. and Dussauze, Marc (2019) Effect of sodium addition and thermal annealing on second-order optical nonlinearity in thermally poled amorphous Ta2O5 thin films. Journal of Applied Physics, 125 (1). (doi:10.1063/1.5054857).

Record type: Article

Abstract

We demonstrate second-order optical nonlinearity (SON) induced in amorphous tantalum pentoxide (Ta2O5) films by thermal poling. The effects of sodium addition and thermal annealing on the efficiency and stability of second harmonic generation (SHG) have been investigated. Maker fringe analysis has been used to quantify the poling-induced SON. χ(2) of 0.46 ± 0.02 pm/V and 0.34 ± 0.02  pm/V was achieved for sodium-containing and pure Ta2O5 films, respectively. Both the strength and the temporal stability of the induced nonlinearity are discussed with respect to the poling mechanisms and measured electrical conductivity. The lower density of uncombined charges of the Ta2O5 thin films is believed to play a role in the strength of SHG signal, and the rate of SHG decay decreases with thermal annealing.

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Accepted/In Press date: 10 December 2018
e-pub ahead of print date: 4 January 2019
Published date: 4 January 2019

Identifiers

Local EPrints ID: 428013
URI: http://eprints.soton.ac.uk/id/eprint/428013
ISSN: 0021-8979
PURE UUID: 1b38b2d3-06de-45ca-98e4-c505944c9d35
ORCID for Amy Sen Kay Tong: ORCID iD orcid.org/0000-0002-2026-2062
ORCID for G. Senthil Murugan: ORCID iD orcid.org/0000-0002-2733-3273
ORCID for James S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

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Date deposited: 06 Feb 2019 17:30
Last modified: 18 Feb 2021 17:05

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