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Nanoscale imaging of domains and domain walls in periodically poled ferroelectrics using atomic force microscopy
KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
KTH, Tidigare Institutioner (före 2005), Materialvetenskap.ORCID-id: 0000-0003-2070-9167
KTH, Tidigare Institutioner (före 2005), Materialvetenskap.
KTH, Tidigare Institutioner (före 2005), Fysik.
Vise andre og tillknytning
2002 (engelsk)Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 80, nr 9, s. 1622-1624Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We use the inverse piezoelectric effect for high-resolution imaging of artificially produced ferroelectric domains in periodically poled potassium titanium phosphate, KTiOPO4, and lithium niobate, LiNbO3, crystals using a modified atomic force microscope (AFM). By monitoring the vertical as well as the lateral deflection of the AFM tip, details of the domains and the domain walls were obtained at 1 nm resolution. With this approach we determine the domain wall width to be 20-80 nm for KTiOPO4 and about 150 nm for LiNbO3. The above technique is of importance in tailoring ferroelectric crystals for frequency conversion of lasers and studies of domain walls in ferroelectric and its magnetic analogs.

sted, utgiver, år, opplag, sider
2002. Vol. 80, nr 9, s. 1622-1624
Emneord [en]
NONLINEAR DIELECTRIC MICROSCOPY, WAVE-GUIDE, FIELD, FATIGUE, KTIOPO4, LINBO3, FILMS
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-7990DOI: 10.1063/1.1455700ISI: 000174181400040Scopus ID: 2-s2.0-79956051948OAI: oai:DiVA.org:kth-7990DiVA, id: diva2:13191
Merknad
QC 20100930. Tidigare titel: Nanoscale characterisation of domains in periodically poled ferroelectricsTilgjengelig fra: 2005-10-25 Laget: 2005-10-25 Sist oppdatert: 2022-06-26bibliografisk kontrollert
Inngår i avhandling
1. Domain engineering in KTiOPO4
Åpne denne publikasjonen i ny fane eller vindu >>Domain engineering in KTiOPO4
2005 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Ferroelectric crystals are commonly used in nonlinear optics for frequency conversion of laser radiation. The quasi-phase matching (QPM) approach uses a periodically modulated nonlinearity that can be achieved by periodically inverting domains in ferroelectric crystals and allows versatile and efficient frequency conversion in the whole transparency region of the material.

KTiOPO4 (KTP) is one of the most attractive ferroelectric non-linear optical material for periodic domain-inversion engineering due to its excellent non-linearity, high resistance for photorefractive damage, and its relatively low coercive field. A periodic structure of reversed domains can be created in the crystal by lithographic patterning with subsequent electric field poling. The performance of the periodically poled KTP crystals (PPKTP) as frequency converters rely directly upon the poling quality. Therefore, characterization methods that lead to a deeper understanding of the polarization switching process are of utmost importance.

In this work, several techniques have been used and developed to study domain structure in KTP, both in-situ and ex-situ. The results obtained have been utilized to characterize different aspects of the polarization switching processes in KTP, both for patterned and unpatterned samples.

It has also been demonstrated that it is possible to fabricate sub-micrometer (sub-μm) PPKTP for novel optical devices. Lithographic processes based on e-beam lithography and deep UV-laser lithography have been developed and proven useful to pattern sub- μm pitches, where the later has been the most convenient method. A poling method based on a periodical modulation of the K-stoichiometry has been developed, and it has resulted in a sub-μm domain grating with a period of 720 nm for a 1 mm thick KTP crystal. To the best of our knowledge, this is the largest domain aspect-ratio achieved for a bulk ferroelectric crystal. The sub-micrometer PPKTP samples have been used for demonstration of 6:th and 7:th QPM order backward second-harmonic generation with continuous wave laser excitation, as well as a demonstration of narrow wavelength electrically-adjustable Bragg reflectivity.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2005. s. 108
Serie
Trita-FYS, ISSN 0280-316X ; 2005:49
Emneord
quasi-phase matching, KTiOPO4, ferroelectric domains, atomic force microscopy, periodic electric field poling, polarization switching, second harmonic generation
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-464 (URN)91-7178-152-8 (ISBN)
Disputas
2005-10-28, sal FA32, AlbaNova, Roslagstullsbacken 21, Stockholm, 13:00
Opponent
Veileder
Merknad
QC 20100930Tilgjengelig fra: 2005-10-25 Laget: 2005-10-25 Sist oppdatert: 2022-06-26bibliografisk kontrollert

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