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Light-assisted domain engineering, waveguide fabrication and microstructuring of lithium niobate

Light-assisted domain engineering, waveguide fabrication and microstructuring of lithium niobate
Light-assisted domain engineering, waveguide fabrication and microstructuring of lithium niobate
The thesis is focussing on the interaction of lithium niobate with UV and ultrafast laser radiation to achieve 1) ferroelectric domain inversion, 2) waveguide fabrication, and 3) surface microstructuring.

Preferential ferroelectric domain inversion has been demonstrated by 'latent light-assisted poling' and 'inhibition of poling' using ultrafast laser irradiation at 400 nm and CW highly absorbed UV radiation (305..244 nm) respectively. The characteristics of the resultant domains have been experimentally investigated as a function of the fabrication conditions and a theoretical model have been proposed to explain the experimental observations. UV radiation in the 305 nm to 244 nm range have been used for the fabrication of optical waveguides in lithium niobate. The waveguiding characteristics and electro-optic response of the UV written optical channel waveguides have been investigated experimentally. Inhibition of poling and post processing has been used for the fabrication of ridge waveguide structures with enhanced refractive index change. Finally, a method for the fabrication of ultra-smooth lithium niobate single crystal photonic microstructures has been proposed. The method is based on surface tension reshaping of surface microstructures which are produced by preferential poling and subsequent etching. Whispering gallery mode resonators have been fabricated and characterised here.
University of Southampton
Ying, Yongjun
1cc13d62-ee04-4ca3-b0b8-e60a523dc145
Ying, Yongjun
1cc13d62-ee04-4ca3-b0b8-e60a523dc145
Mailis, Sakellaris
233e0768-3f8d-430e-8fdf-92e6f4f6a0c4

Ying, Yongjun (2010) Light-assisted domain engineering, waveguide fabrication and microstructuring of lithium niobate. University of Southampton, Optoelectronics Research Centre, Doctoral Thesis, 193pp.

Record type: Thesis (Doctoral)

Abstract

The thesis is focussing on the interaction of lithium niobate with UV and ultrafast laser radiation to achieve 1) ferroelectric domain inversion, 2) waveguide fabrication, and 3) surface microstructuring.

Preferential ferroelectric domain inversion has been demonstrated by 'latent light-assisted poling' and 'inhibition of poling' using ultrafast laser irradiation at 400 nm and CW highly absorbed UV radiation (305..244 nm) respectively. The characteristics of the resultant domains have been experimentally investigated as a function of the fabrication conditions and a theoretical model have been proposed to explain the experimental observations. UV radiation in the 305 nm to 244 nm range have been used for the fabrication of optical waveguides in lithium niobate. The waveguiding characteristics and electro-optic response of the UV written optical channel waveguides have been investigated experimentally. Inhibition of poling and post processing has been used for the fabrication of ridge waveguide structures with enhanced refractive index change. Finally, a method for the fabrication of ultra-smooth lithium niobate single crystal photonic microstructures has been proposed. The method is based on surface tension reshaping of surface microstructures which are produced by preferential poling and subsequent etching. Whispering gallery mode resonators have been fabricated and characterised here.

Text
C.Y.J.Ying PhD thesis - Version of Record
Available under License University of Southampton Thesis Licence.
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More information

Published date: October 2010
Organisations: University of Southampton, Optoelectronics Research Centre

Identifiers

Local EPrints ID: 301282
URI: https://eprints.soton.ac.uk/id/eprint/301282
PURE UUID: 88797a12-38fb-4dac-a0c3-13e6216126af
ORCID for Sakellaris Mailis: ORCID iD orcid.org/0000-0001-8100-2670

Catalogue record

Date deposited: 20 Apr 2012 14:19
Last modified: 08 Aug 2019 00:37

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