Dielectric electrooptic gratings in potassium lithium tantalate niobate

Agranat, Aharon J.; Oliveira, C.E.M. de; Orr, G. William

doi:10.1016/j.jnoncrysol.2007.02.074

Cited by 9 publications

(8 citation statements)

References 8 publications

(8 reference statements)

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“…The strong similarity between this enhancement and those observed under unbiased conditions at T C (Fig. 3b) indicates that E C coincides with the coercive field, and the discontinuity corresponds to the fieldinduced phase transition 16,26,35 . In fact, in Fig.…”

Section: Spontaneous Polarization Underlying the Ferroelectric Superlsupporting

confidence: 67%

“…Observation of a compositionally induced super-crystal. To investigate the matter, we make use of top-seeded ferroelectric crystals with an oscillating composition along the growth axis achieved using an off-centre growth technique in the furnace 33,35 . We obtain a zero-cut 2.4 mm by 2.0 mm by 1.7 mm, along the x,y,z directions, respectively, optical-quality KLTN sample with a periodically oscillating niobium composition of period L ¼ 5.5 mm along the x axis, with an average…”

Section: Resultsmentioning

confidence: 99%

“…We consider a compositionally disordered perovskite of KLTN, K 1 À a Li a Ta 1 À b Nb b O 3 with a ¼ 0.04 and b ¼ 0.38, grown through the top-seeded solution method by extracting a zero-cut 2.4 mm by 2.0 mm by 1.7 mm, along the x, y, z directions, respectively, optical-quality specimen. It shows, through low-frequency dielectric spectroscopy measurements, the spatial-averaged Curie point, which signals the transition from the high-temperature symmetric paraelectric phase to the low-temperature ferroelectric phase, at the room temperature T C ¼ 294 K. A 1D seed microstructure is embedded into the sample as it is grown through the off-centre growth technique so as to manifest a sinusoidal variation in the low-frequency dielectric constant, and thus in the critical temperature T C , along the growth axis (x direction) 33,35 . This dielectric volume microstructure causes an index of refraction oscillation of period L ¼ 5.5 mm, which is able to diffract light linearly and electro-optically 49 .…”

Section: Methodsmentioning

confidence: 99%

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Super-Crystals in Composite Ferroelectrics

Domenico¹

2019

Springer Theses

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As atoms and molecules condense to form solids, a crystalline state can emerge with its highly ordered geometry and subnanometric lattice constant. In some physical systems, such as ferroelectric perovskites, a perfect crystalline structure forms even when the condensing substances are non-stoichiometric. The resulting solids have compositional disorder and complex macroscopic properties, such as giant susceptibilities and non-ergodicity. Here, we observe the spontaneous formation of a cubic structure in composite ferroelectric potassiumlithium-tantalate-niobate with micrometric lattice constant, 10 4 times larger than that of the underlying perovskite lattice. The 3D effect is observed in specifically designed samples in which the substitutional mixture varies periodically along one specific crystal axis. Laser propagation indicates a coherent polarization super-crystal that produces an optical X-ray diffractometry, an ordered mesoscopic state of matter with important implications for critical phenomena and applications in miniaturized 3D optical technologies.

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Section: Spontaneous Polarization Underlying the Ferroelectric Superlsupporting

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Super-Crystals in Composite Ferroelectrics

Domenico¹

2019

Springer Theses

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“…To investigate the matter, we make use of top-seeded ferroelectric crystals with an oscillating composition along the growth axis achieved using an off-centre growth technique in the furnace 33 35 . We obtain a zero-cut 2.4 mm by 2.0 mm by 1.7 mm, along the x , y , z directions, respectively, optical-quality KLTN sample with a periodically oscillating niobium composition of period Λ =5.5 μm along the x axis, with an average composition K 1− α Li α Ta 1− β Nb β O 3 , where α =0.04 and β =0.38 (see Methods).…”

Section: Resultsmentioning

confidence: 99%

Super-crystals in composite ferroelectrics

et al. 2016

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As atoms and molecules condense to form solids, a crystalline state can emerge with its highly ordered geometry and subnanometric lattice constant. In some physical systems, such as ferroelectric perovskites, a perfect crystalline structure forms even when the condensing substances are non-stoichiometric. The resulting solids have compositional disorder and complex macroscopic properties, such as giant susceptibilities and non-ergodicity. Here, we observe the spontaneous formation of a cubic structure in composite ferroelectric potassium–lithium–tantalate–niobate with micrometric lattice constant, 104 times larger than that of the underlying perovskite lattice. The 3D effect is observed in specifically designed samples in which the substitutional mixture varies periodically along one specific crystal axis. Laser propagation indicates a coherent polarization super-crystal that produces an optical X-ray diffractometry, an ordered mesoscopic state of matter with important implications for critical phenomena and applications in miniaturized 3D optical technologies.

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“…The Curie point at the temperature T C ¼ 294 K is measured and characterized through low-frequency dielectric spectroscopy that also signals the absence of large deviations from the mean-field behavior, typical of other near-transition disordered ferroelectric samples [16,17]. The sample is grown so as to manifest a sinusoidal variation in the low-frequency dielectric constant [18][19][20]. An electric field can turn this volume microstructure into a periodic index of refraction modulation ΔnðxÞ through the quadratic electro-optic effect [21].…”

mentioning

confidence: 99%

Continuous Solitons in a Lattice Nonlinearity

et al. 2015

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We study theoretically and experimentally the propagation of optical solitons in a lattice nonlinearity, a periodic pattern that both affects and is strongly affected by the wave. Observations are carried out using spatial photorefractive solitons in a volume microstructured crystal with a built-in oscillating low-frequency dielectric constant. The pattern causes an oscillating electro-optic response that induces a periodic optical nonlinearity. On-axis results in potassium-lithium-tantalate-niobate indicate the appearance of effective continuous saturated-Kerr solitons, where all spatial traces of the lattice vanish, independently of the ratio between beam width and lattice constant. Decoupling the lattice nonlinearity allows the detection of discrete delocalized and localized light distributions, demonstrating that the continuous solitons form out of the combined compensation of diffraction and of the underlying periodic volume pattern.

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Dielectric electrooptic gratings in potassium lithium tantalate niobate

Cited by 9 publications

References 8 publications

Super-Crystals in Composite Ferroelectrics

Super-Crystals in Composite Ferroelectrics

Super-crystals in composite ferroelectrics

Continuous Solitons in a Lattice Nonlinearity

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