Nonlinear optical activity in Bridgman growth layered compounds

Miah, M. Idrish

doi:10.1016/j.matchemphys.2009.09.013

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…As a particular role of the local electron-phonon anharmonicity is described by third-order-rank tensors in disordered systems, 12,18,19 the SHG is very similar to that introduced for the third- order nonlinear optical susceptibility, which has been confirmed by observing the relatively large third-order susceptibility of undoped CdI 2 single crystals. [7][8][9][10] The local disordering of the copper aggregators plays additional role in the size effect of the nanocrystals. [20][21][22][23] As can be seen, for a copper content of about 0.65%, the value of (2) ijk χ achieves its maximum irrespective of the size of the nanocrystals.…”

Section: Resultsmentioning

confidence: 99%

“…The results show that CdI 2 processes third-order optical nonlinearities. [6][7][8][9][10] However, Cu-doped CdI 2 crystals were first studied by Kityk et al, 11 where they studied magnetic field-induced ferroelectricity and showed that the introduction of Cudoping in CdI 2 makes the crystal noncentrosymmetric. Subsequent investigations for the systems are also available in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Observation of the nano-effect on the SHG in moderately Cu-doped CdI2 thin nanocrystals

Miah

2015

Bull Mater Sci

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Nanocrystals take into account the nano-sized quantum-confined effect, where k-space bulk-like dispersion disappears and discrete excitonic-like nanolevels occur within the forbidden energy gap of the material processes. Nanocrystals of cadmium iodide both un-doped and doped with copper, synthesized and grown by the standard Bridgman method, were analysed by scanning electron microscopy for the investigation of the nano-confined effect on the optical nonlinearity. The second harmonic generation (SHG) of the crystals was measured and studied. The second-order optical susceptibilities in dependences of the size of the nanocrystals and of their copper contents within low levels were calculated. The results showed a clear increase in the SHG with the decrease in the thickness of the nanocrystals. The observed size dependence, however, demonstrates the nano-confined effect or nano-effect on the SHG, where the quantum confinement dominates the material's optical properties. A significant change in the second-order optical response with copper content of the nanocrystals was also observed. The observed results are discussed by exploring the photo-induced electron-phonon anharmonic interaction for the noncentrosymmetry of the nanocrystallite's process.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Observation of the nano-effect on the SHG in moderately Cu-doped CdI2 thin nanocrystals

Miah

2015

Bull Mater Sci

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“…The principal structural element of the lattice is a 2+ 4-6 [Cd I ] − octahedral complex formed by 2+ Cd in an octahedral interstice [1][2][3][4]. Previous investigations of CdI 2 crystals have been performed both theoretically [5][6][7][8] and experimentally [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Long-term evolution of luminescent properties in CdI2 crystals

Karbovnyk

Bolesta

Rovetskyi

et al. 2016

Low Temperature Physics

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Fresh and aged melt-grown or gas-phase grown CdI 2 crystals are studied by means of low-temperature photoluminescence spectroscopy. Noticeable transformations of emission spectra are observed after long-term aging. The formation of nanostructures containing cadmium oxide and cadmium hydroxide as well as the changes in local surrounding of iodine atoms and the possible growth of polytypic modifications of CdI 2 are taken into account when considering the diversity of optical spectra. PACS: 78.55.-m Photoluminescence, properties and materials; 78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures.

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“…Layered transition metal oxides provide a rich structural source for a broad spectrum of intriguing properties, from superconductivity − to ferroelectricity, energy storage, , and optical activity, and they continue to be an active subject of considerable interest in current physics and chemistry. Of these interesting compounds, Aurivillius phases represent one important subgroup, formulated as Bi 2 A n –1 B n O 3 n +3 , where A is an electropositive atom while the B site typically accepts the early transition metal.…”

Section: Introductionmentioning

confidence: 99%

Interlayer Communication in Aurivillius Vanadate to Enable Defect Structures and Charge Ordering

et al. 2015

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The fluorite-like [Bi2O2](2+) layer is a fundamental building unit in a great variety of layered compounds. Here in this contribution, we presented a comprehensive study on an unusual Aurivillius phase Bi3.6V2O10 with respect to its defect chemistry and polymorphism control as well as implications for fast oxide ion transport at lower temperatures. The bismuth oxide layer in Bi4V2O11 is found to tolerate a large number of Bi vacancies without breaking the high temperature prototype I4/mmm structure (γ-phase). On cooling, an orthorhombic distortion occurs to the γ-phase, giving rise to a different type of phase (B-phase) in the intermediate temperature region. Cooling to room temperature causes a further transition to an oxygen-vacancy ordered A-phase, which is accompanied by the charge ordering of V(4+) and V(5+) cations, providing magnetic (d(1)) and nonmagnetic (d(0)) chains along the a axis. This is a novel charge ordering transition in terms of the concomitant change of oxygen coordination. Interestingly, upon quenching, both the γ- and B-phase can be kinetically trapped, enabling the structural probing of the two phases at ambient temperature. Driven by the thermodynamic forces, the oxide anion in the γ-phase undergoes an interlayer diffusion process to reshuffle the compositions of both Bi-O and V-O layers.

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Nonlinear optical activity in Bridgman growth layered compounds

Cited by 9 publications

References 15 publications

Observation of the nano-effect on the SHG in moderately Cu-doped CdI2 thin nanocrystals

Observation of the nano-effect on the SHG in moderately Cu-doped CdI2 thin nanocrystals

Long-term evolution of luminescent properties in CdI2 crystals

Interlayer Communication in Aurivillius Vanadate to Enable Defect Structures and Charge Ordering

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