Raman spectroscopy and the origin of electrooptical Kerr phenomenon in niobium alkali-silicate glasses

Lipovskii, A. A.; Tagantsev, D. K.; Vetrov, A. A.; Yanush, O. V.

doi:10.1016/s0925-3467(02)00093-9

Cited by 63 publications

(71 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3,5,6,33 In particular, the nonlinear response of Nb-containing glasses has previously been observed to increase with the molar fraction of Nb 2 O 5 . [8][9][10]25,33,34 This is the trend observed in the present work in the case of transparent bulk glasses. However, when comparing film and bulk glasses with similar Nb contents (G10, G1), an increase of /v (3) / close to one order of magnitude is observed, which has not been previously reported.…”

Section: Discussionsupporting

confidence: 86%

“…The band at 500-650 cm À1 is related to a three-dimensional network formed by slightly distorted [NbO 6 ] octahedra, whereas the peak at 880 cm À1 is assigned to vibrations of isolated [NbO 6 ] octahedra with NBO. [8][9][10][24][25][26] Finally, the sharp peak at 720 cm À1 is also associated to Nb-O vibrations in [NbO 6 ] octahedra. 30 Raman spectra of ternary bulk samples present a combination of the vibrational modes observed in the binary samples.…”

Section: Methodsmentioning

confidence: 94%

“…The comparison of the experimental results with the values calculated using either BGO or Lines' models suggests the existence of additional factors contributing to the nonlinear response in the case of the film glasses. The structural analysis performed demonstrates the existence of two clear differences between bulk and film glasses that should be in the origin of the observed increase of /v (3) In the case of niobio-(boro)phosphate glasses, [8][9][10]24,25 the observed significant increase of the nonlinear response has been related to the formation of first two-dimensional (2D) and then three-dimensional (3D) associations of Nboxygenated sites by clustering of [NbO 6 ] octahedra as [Nb] increases. 7,9,10,26 Taking this into account along with the structural analysis made by Raman spectroscopy, it is possible to depict the evolution of the film glass structure as [Nb] F increases.…”

Section: A Evaluation Of the Nonlinear Response In The Frame Of Bgo mentioning

confidence: 92%

“…The coordination of Nb 5þ in oxide crystals is typically octahedral and rarely tetrahedral. 29 In the case of glasses most works assign the bands observed in Raman spectra to [NbO 6 ] octahedra, [8][9][10][24][25][26] although the existence of [NbO 4 ] has been proposed in the case of niobium germanate glasses. 28,30 Still, Nb-O bond lengths in [NbO 6 ] (2.0 Å ) and [NbO 4 ] (1.9 Å ) are so close that is extremely difficult to neatly assign Raman bands to modes associated to any of these units.…”

Section: Methodsmentioning

confidence: 99%

“…28,30 Still, Nb-O bond lengths in [NbO 6 ] (2.0 Å ) and [NbO 4 ] (1.9 Å ) are so close that is extremely difficult to neatly assign Raman bands to modes associated to any of these units. 25,31 We have assumed in the present work an octahedral coordination for the band assignment based on previously published works. The band at 500-650 cm À1 is related to a three-dimensional network formed by slightly distorted [NbO 6 ] octahedra, whereas the peak at 880 cm À1 is assigned to vibrations of isolated [NbO 6 ] octahedra with NBO.…”

Section: Methodsmentioning

confidence: 99%

See 4 more Smart Citations

Structural origin of the nonlinear optical properties of lead niobium germanate film glasses

Muñoz-Martín¹,

Cruz²,

Fernández-Navarro³

et al. 2011

Journal of Applied Physics

View full text Add to dashboard Cite

Linear and nonlinear optical susceptibilities and hyperpolarizability of borate LiNaB4O7 single crystals: Theory and experiment J. Appl. Phys. 112, 053526 (2012) Effect of Lorentz local field for optical second order nonlinear susceptibility in ZnO nanorod J. Appl. Phys. 111, 103112 (2012) Size dependent optical properties of the CdSe-CdS core-shell quantum dots in the strong confinement regime J. Appl. Phys. 111, 074312 (2012) Methyl groups at dielectric and metal surfaces studied by sum-frequency generation in co-and counterpropagating configurations J. Chem. Phys. 135, 044704 (2011) The third-order nonlinear optical coefficients of Si, Ge, and Si1−xGex in the midwave and longwave infrared J. Appl. Phys. 110, 011301 (2011) Additional information on J. Appl. Phys. The structural origin of the nonlinear optical susceptibility (/v (3) /) of lead-niobium-germanate film glasses with large Nb 2 O 5 contents has been investigated. /v (3) / shows a strong enhancement with the Nb content in the films with /v (3) / values close to 2 Â 10 À11 esu at 800 nm for a Nb content as high as 0.71. Boling-Glass-Owyoung and Lines' semiempirical models predict accurately the values of /v (3) / for transparent bulk glasses but not for film glasses. This discrepancy is related to the remarkable structural differences between them. Raman spectroscopy suggests the formation of a three-dimensional (3D) structure of [NbO 6 ] octahedra in the case of film glasses having large Nb contents, while X-ray photoelectron spectroscopy shows that a significant fraction of these units contain Nb 4þ ions. The combination of a 3D structure of [NbO 6 ] with the presence of Nb 4þ polarons and their migration through electron intervalence transfer is proposed as the origin of the observed enhancement of /v (3) / in the film glasses.

show abstract

Section: Discussionsupporting

confidence: 86%

Section: Methodsmentioning

confidence: 94%

Section: A Evaluation Of the Nonlinear Response In The Frame Of Bgo mentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Structural origin of the nonlinear optical properties of lead niobium germanate film glasses

Muñoz-Martín¹,

Cruz²,

Fernández-Navarro³

et al. 2011

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

Raman Spectroscopy of Glasses

Almeida

Santos

2015

Modern Glass Characterization

View full text Add to dashboard Cite

Pyroelectricity in Highly Stressed Quasi‐Amorphous Thin Films

et al. 2003

View full text Add to dashboard Cite

Spontaneous or stress-induced polarization, signifying pyroelectricity and piezoelectricity, respectively, can appear in ionic solids solely due to a non-centrosymmetrical spatial distribution of ions in a polar crystalline structure. Although theory does not impose strict limitations on the size of a polar crystallite, [1,2] the magnitude of pyroelectric and piezoelectric effects of some ceramics, particularly BaTiO 3 , rapidly decrease as grain size diminishes to a few nanometers. [1,3,4] Determination of the minimal number of periodically arranged unit cells for which a crystal retains pyroelectric and piezoelectric properties has become increasingly important due to the rapid incorporation of these materials into nanometer-scale devices. An intriguing complication to this quest arises from the fact that pyro-and piezoelectric effects may exist in structures that lack the spatial periodicity inherent for ionic crystals, but are composed of polar molecules with directional ordering. An example of such a material is a nematic liquid crystal. Spontaneous or stress-induced dipole ordering without fine-tuned positional order is theoretically possible in ionic solids [5] as well; however, only indirect experimental evidence supporting this theory has been presented so far.[6±9] The present work reports on the preparation and pyroelectric properties of quasiamorphous BaTiO 3 thin films that represent a polar ionic solid without spatial periodicity. Pyroelectric amorphous BaTiO 3 films were obtained by passing sputtered amorphous BaTiO 3 films through a steep temperature gradient. As-deposited BaTiO 3 films were stressfree (< ± 30 MPa) with refractive indices in the range of n^= 1.97±2.02, and a very small in-plane±out-of-plane birefringence of n i ± n^= ± (0.002±0.008), confirming film isotropy. A compressive stress of r e = 2.0±2.2 GPa developed in the films passed through the temperature gradient. The refractive index of these films decreased to n^= 1.89/1.94 but the birefringence grew to n i ± n^= 0.03±0.07, corroborating the existence of high in-plane compressive stress.X-ray diffraction (XRD) spectra of the films passed through the temperature gradient were indistinguishable from those of as-deposited films (Fig. 1a). No XRD peaks apart from those of the Si substrate were observed, indicating the absence of a crystalline phase. The volume detection limit of a crystalline phase by XRD calculated from the signal to noise ratio [10] was < 0.3 %. Furthermore, thorough transmission electron microscopy (TEM) investigation only rarely detected the presence of crystalline grains (Fig. 1b) [11] and the concentration of the crystallites estimated from TEM images was far below 0.3 %. In contrast to the similarity with respect to electron and X-ray diffraction analysis, as-deposited films and the films passed through the temperature gradient have distinctly different electrical properties. The films passed through the temperature gradient show a large pyroelectric effect p measured = (1±3) 10 ±9 C cm ±2 K ±1 (5±15 % that of...

show abstract

Raman spectroscopy and the origin of electrooptical Kerr phenomenon in niobium alkali-silicate glasses

Cited by 63 publications

References 18 publications

Structural origin of the nonlinear optical properties of lead niobium germanate film glasses

Structural origin of the nonlinear optical properties of lead niobium germanate film glasses

Raman Spectroscopy of Glasses

Pyroelectricity in Highly Stressed Quasi‐Amorphous Thin Films

Contact Info

Product

Resources

About