Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
In-situ visualization, monitoring and analysis of electric field domain reversal process in ferroelectric crystals by digital holography
Show others and affiliations
2004 (English)In: Optics express, ISSN 1094-4087, Vol. 12, no 9, 1832-1842 p.Article in journal (Refereed) Published
Abstract [en]

In-situ monitoring of domain reversal in congruent lithium niobate by a digital holographic technique is described. While the ferroelectric polarization is reversed by electric field poling, the two-dimensional distribution of the phase shift, due mainly to the linear electro-optic and piezoelectric effects, is measured and visualized. Digital holography is used to reconstruct both amplitude and phase of the wavefield transmitted by the sample to reveal the phase shift induced by adjacent reversed domains during the poling. The resulting movies of both amplitude and phase maps, for in-situ visualization of domain pattern formation, are shown. The possibility of using the technique as tool for monitoring in real-time the periodic poling of patterned samples is discussed.

Place, publisher, year, edition, pages
2004. Vol. 12, no 9, 1832-1842 p.
Keyword [en]
Electrooptic Imaging Microscopy; Congruent Litao3 Crystals; Lithium-Niobate Crystals; Internal Field; Reconstruction; Linbo3; Walls; Compensation; Optics; Origin
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-5818ISI: 000221423300007OAI: oai:DiVA.org:kth-5818DiVA: diva2:10326
Note
QC 20100824Available from: 2006-05-30 Created: 2006-05-30 Last updated: 2010-12-06Bibliographically approved
In thesis
1. Ferroelectric domain engineering and characterization for photonic applications
Open this publication in new window or tab >>Ferroelectric domain engineering and characterization for photonic applications
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Lithium niobate (LiNbO3) and KTiOPO4 (KTP) are ferroelectric crystals of considerable interest in different fields of optics and optoelectronics. Due to its large values of the nonlinear optical, electro-optic (EO), piezoelectric and acousto-optical coefficients, LiNbO3 is widely used for laser frequency conversion using the quasiphase matching (QPM) approach where the sign of nonlinearity has been periodically modulated by electric field poling (EFP). In the microwave and telecommunication field LiNbO3 is used for surface acoustic devices and integrated optical modulators. KTP and its isomorphs, on the other hand, exhibit slightly lower nonlinear coefficients but have much higher photorefractive damage thresholds, so that it is mainly used in the fabrication of QPM devices for both UV, IR and visible light generation and in high power applications.

This thesis focus on different key issues: (1) accurate characterization of specific optical properties of LiNbO3, which are of interest in nonlinear and EO applications; (2) in-situ visualization and characterization of domain reversal by EFP in LiNbO3 and KTP crystals for a through understanding of the ferroelectric domain switching; (3) fabrication of periodic surface structures at sub-micron scale in LiNbO for photonic applications. An interferometric method is used for accurate measurement of ordinary and extraordinary refractive indices in uniaxial crystals, which is of great interest in the proper design of QPM crystals. A digital holography (DH) based method is presented here for 2D characterization of the EO properties of LiNbO , which is considerably interesting in the applications where the proper design of the EO device requires a spatially resolved information about the EO behaviour and the existing pointwise techniques are not sufficient. A DH method for novel in-situ monitoring of domain reversal by EFP in both LiNbO3 and KTP, is also presented here. The technqiue could be used as a tool for high fidelity periodic domain engineering but also provides information about domain kinetics, internal field and crystals defects. 3 3 3 Finally this thesis presents novel results concerning nanoscale periodic surface structuring of congruent LiNbO3. Holographic lithography (HL) is used for sub-micron period resist patterning and electric overpoling for surface domain reversal. Surface structures are obtained by selective etching. Moiré effect is also used in the HL to fabricate complicated structures with multiple periods. The depth compatibility with waveguide implementation allows foreseeing possible applications of these structures for Bragg gratings or innovative photonic crystal devices, exploiting the additional nonlinear and EO properties typical of LiNbO3.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. x, 118 p.
Series
Trita-FYS, ISSN 0280-316X ; 2006:40
Keyword
LiNbO, KTiOPO, interferometry, digital holography, electric field poling, electro-optic materials, holographic lithography, ferroelectric domains, nanostructures, microstructures
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-4001 (URN)91-7178-382-2 (ISBN)
Public defence
2006-06-08, Sal FD5, AlbaNova univ centrum, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100824Available from: 2006-05-30 Created: 2006-05-30 Last updated: 2015-03-30Bibliographically approved

Open Access in DiVA

No full text

Other links

http://www.opticsexpress.org/abstract.cfm?id=79763

Search in DiVA

By author/editor
Grilli, Simonettta
Atom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 41 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf