Abnormal optical anisotropy in correlated disorder KTa1−xNbxO3:Cu with refractive index gradient

Zhang, Xin; He, Shan; Zhao, Zhuan; Wu, Pengfei; Wang, Xuping; Liu, Hongliang

doi:10.1038/s41598-018-20756-9

Cited by 13 publications

(3 citation statements)

References 35 publications

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“…This will cause distortion of the lattice, which results in a series of changes, such as the displacement of niobium ions, the asymmetry of KTN crystal at the micro level, and generation of polarized dipoles on the lattice scale. All of these lead to the changes in the refractive index inside the crystal [20]. The incident light is scattered, resulting in a phase delay of the modulated light intensity and attenuation of the modulation depth.…”

Section: Experiments and Discussionmentioning

confidence: 99%

Electro-Optic Intensity Modulation in Fe-Doped KTa0.65Nb0.35O3 Crystals

et al. 2020

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KTa0.65Nb0.35O3 and Fe-doped KTa0.65Nb0.35O3 crystals were grown by the top-seeded solution growth method (TSSG). Fe ion doping significantly improves the electro-optic properties of cubic KTN crystals. We describe their electro-optic modulation theory and experimental research. The electro-optic modulation waveform deduced by theoretical calculation is basically consistent with the waveform measured in the experiment. We observed the attenuation of light modulation under multiple voltage cycles. The modulation curve of the crystal is inconsistent when the crystal voltage is boosting and bucking. Under the same voltage condition, the higher the incident light power, the faster the modulation depth attenuation. In this experiment, the size of the KTN crystal chip is 6 mm × 5 mm × 2 mm. We obtain the effective electro-optic coefficient as s11 − s12 = 1.34 × 10−15 m2/V2; the half-wave voltage near the Curie temperature is 39 V.

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Section: Experiments and Discussionmentioning

confidence: 99%

Electro-Optic Intensity Modulation in Fe-Doped KTa0.65Nb0.35O3 Crystals

et al. 2020

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“…And the effect of film–substrate interface is very complex. Recently, KTa 1– x Nb x O 3 single crystal with refractive index gradient show good optical properties, − such as high output power and high tuning speed amplified spontaneous emission (ASE) source . Hence, bulk materials with continued CGs are potential alternatives to investigate the effect of CGs on micro and macro properties.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Composition Gradient on Microdomain Structure and the Macro-Ferroelectric/Piezoelectric Properties

Huang

Meng

et al. 2019

Crystal Growth & Design

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Internal fields caused by strain gradient, composition gradient (CG), and space charges have significant influences on micro and macro properties of ferroelectrics. Here, we report the relationship among composition gradient, microdomain structure, and macroscopic ferroelectric/piezoelectric properties. Three KTa1–x Nb x O3 samples with the same Curie temperature T c = 39 °C and different CGs are designed and investigated. As CG decreases, the scale of domains decreases from ∼10 μm to 200 nm, and the spontaneous polarizations orientate more randomly, which leads to a smaller ratio of lattice content c to a (c/a). Furthermore, dielectric constant and d 33 increases dramatically from 6000 to 11 000 and from 203 to 345 pC N–1, respectively. This relationship is important for prospective applications due to its controllability of microdomains and polarization states. In addition, we reveal that CG and composition fluctuation induce internal fields (E in) and resilience, respectively, leading to the frequency-dependent biased and standard double polarization–electric field (P–E) loops. Moreover, the existence of CGs drives the formation of different size domains by E in, which provides a way to adjust ferroelectric and piezoelectric properties by controlling CG. As well, it is important for the study of flexoelectric on continuous CG bulk materials.

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“…At present, the growth methods for KTN single crystals are fully developed. Specifically, this provided the advantage that the composition of the crystal could be controlled accurately. − …”

Section: Introductionmentioning

confidence: 99%

Controllable Gradient in the Composition of a Ferroelectric Single Crystal

Meng

Tian

et al. 2019

Crystal Growth & Design

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Graded ferroelectric materials have attracted great attention because of their peculiar properties arising from the evolution of their microscopic structure. Graded bulk materials are advantageous because of their unique effects that can only be observed in bulk samples. A tetragonal KTa 1−x Nb x O 3 single crystal with graded composition (GC) was designed and grown with the goal of exploring the effects of GC on the macroscopic properties of the crystal. The crystal was produced via the top-seed solution growth method. A mechanism of the formation of an internal electric field induced by GC was elucidated, and an enhancement of the strain was observed as a result of the internal electric field.

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Abnormal optical anisotropy in correlated disorder KTa1−xNbxO3:Cu with refractive index gradient

Cited by 13 publications

References 35 publications

Electro-Optic Intensity Modulation in Fe-Doped KTa0.65Nb0.35O3 Crystals

Electro-Optic Intensity Modulation in Fe-Doped KTa0.65Nb0.35O3 Crystals

The Effect of Composition Gradient on Microdomain Structure and the Macro-Ferroelectric/Piezoelectric Properties

Controllable Gradient in the Composition of a Ferroelectric Single Crystal

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