Phase composition of Z-cut protonated LiNbO3: a Raman study

Savova, I.; Savatinova, I.; Liarokapis, E.

doi:10.1016/s0925-3467(00)00046-x

Cited by 12 publications

(15 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to previous works these four modes correspond to vibrations along the z-axis of Nb ions against the O sublattice leaving Li relatively static ͑ATO 1 mode͒, antiphase vibrations along the z-axis of Li and Nb ions with respect to the O ions ͑ATO 2 mode͒, to rigid rotations of the whole O ion octahedron along the c-axis ͑ATO 3 mode͒, and to stretching vibrations of the O octahedron along the xy-plane ͑ATO 4 mode͒. 23,24,35,36 A general response of all these Raman modes to the presence of extended defects within the LN network is a decrease in intensity. 37 In addition, the presence of structural disorder in the LN lattice will broaden all the observed Raman modes.…”

Section: -Ramanmentioning

confidence: 96%

Anisotropic lattice changes in femtosecond laser inscribed Nd3+:MgO:LiNbO3 optical waveguides

Ródenas

Maestro

Ramı́rez

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

Aniso t r o pi c la t tic e c h a n g e s in fe m t o s e c o n d la s e r in s c ri b e d N d 3 + : M g O:Li N b O 3 o p tic al w a v e g ui d e s M a r ti n e z M a e s t r o, L, Ro d e n a s , A, R a mi r e z, M O, Tor c hi a, G A, Ro s o, L, C h e n, F a n d Ja q u e , D h t t p:// dx. d oi.o r g/ 1 0. 1 0 6 3/ 1. 3 1 6 8 4 3 2 Ti t l e Aniso t r o pic la t tic e c h a n g e s in fe m t o s e c o n d la s e r in s c ri b e d N d 3 + : M g O:Li N b O 3 o p ti c al w av e g ui d e s A u t h o r s M a r ti n e z M a e s t r o, L, Ro d e n a s , A, R a mi r e z, M O, Tor c hi a, G A, Ro s o, L, C h e n, F a n d Ja q u e, D Typ e Articl e U RL This ve r sio n is a v ail a bl e a t : h t t p:// u sir.s alfo r d. a c. u k/id/ e p ri n t/ 5 3 3 6 6/ P u b l i s h e d D a t e 2 0 0 9 U SIR is a di git al c oll e c tio n of t h e r e s e a r c h o u t p u t of t h e U niv e r si ty of S alfo r d. W h e r e c o py ri g h t p e r mi t s, full t e x t m a t e ri al h el d in t h e r e p o si to ry is m a d e fr e ely a v ail a bl e o nli n e a n d c a n b e r e a d , d o w nlo a d e d a n d c o pi e d fo r n o nc o m m e r ci al p riv a t e s t u dy o r r e s e a r c h p u r p o s e s . Pl e a s e c h e c k t h e m a n u s c ri p t fo r a n y fu r t h e r c o py ri g h t r e s t ri c tio n s. Fo r m o r e info r m a tio n, in cl u di n g o u r p olicy a n d s u b mi s sio n p r o c e d u r e , pl e a s e c o n t a c t t h e R e p o si to ry Te a m a t: u si r@ s alfo r d. a c. u k .We report on the fabrication and microspectroscopy imaging of femtosecond laser written double-filament based Nd 3+ : MgO: LiNbO 3 optical waveguides. The waveguiding high refractive-index regions are identified by blueshifts of the Nd 3+ ion fluorescence lines with no deterioration in the fluorescence efficiency, whereas filamentary low-index regions are identified by both a Nd 3+ line redshift and a fluorescence efficiency reduction. The lattice structural micromodifications at the origin of both waveguide formation and Nd 3+ fluorescence changes have been investigated by means of confocal micro-Raman experiments. We have found that the direct laser written filaments are mainly constituted by a large density of defects, together with a marked axial compression perpendicular to the filaments ͑along the optical c-axis͒. Conversely, the high-index waveguiding regions are characterized by a pronounced anisotropic dilatation of the LiNbO 3 lattice xy-planes.

show abstract

Section: -Ramanmentioning

confidence: 96%

Anisotropic lattice changes in femtosecond laser inscribed Nd3+:MgO:LiNbO3 optical waveguides

Ródenas

Maestro

Ramı́rez

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…2 nd run showed clearly that a hysteresis behavior exists, which mean that the structural changes occurring at -100°C while cooling are kept to higher temperatures (-50 to +80°C) while heating as indicated by the abnormal temperature dependence of the intensity and frequency. Savatinova reported a similar behavior concerning a remarkable broadening of the vibrational bands leading to an overlap of the closely spaced bands in addition to the appearance of a new band at 70 cm -1 which was completely absent in the pure crystals of LiNbO 3 and LiTaO 3 crystals [4,6].…”

Section: Resultsmentioning

confidence: 54%

“…At room temperature LN is a ferroelectric material, characterized with its high electrooptic, piezoelectric and non-linear coefficients, together with high optical damage threshold and large birefringence which allows phase matching in addition to a broad spectral region of transparency (0.4-5 μm). These properties are very attractive for the integrated optics devices properties, and accordingly, serious attention has been paid to the preparation of high quality optical waveguides in this crystal [4].…”

Section: Introductionmentioning

confidence: 99%

Detection of Two Phases Coexisting at the Phase Transition Temperature in LiNbO3 single crystal by using Raman Spectroscopy

2008

Egyptian Journal of Solids

View full text Add to dashboard Cite

“…The confocal microscope integrated into the Raman spectrometer, along with the precision and repeatability of the computer-controlled To determine the phase composition of the waveguides, we took into account the data provided by Raman spectroscopy, knowing that each H x Li 1−x NbO 3 phase has a specific spectrum [9][10][11][12]. Proton exchange influences both vibration modes in Raman spectra, causing intensity reduction of some of the Raman lines, the appearance of new ones, and the appearance of disorder-induced broadening of some Raman bands [9][10][11][12][13][14][15][16][17][18]. The Raman spectra were measured with a LabRAM HR800 spectrometer (Horiba Scientific, Jobin Yvon S.A.S.…”

Section: Samples Fabrication and Index Profiles Reconstructionmentioning

confidence: 99%

“…The existence of six to seven phases of H x Li 1−x NbO 3 (depending on the crystallographic orientation of the main surface of the crystal plate) has been established in waveguides fabricated using various proton exchange techniques, including Proton Exchange, Annealed Proton Exchange, Soft Proton Exchange, Vapor-phase Proton Exchange, and High Index Soft Proton Exchange [9,10,15,19,22,25,27]. The specific Raman and IR reflection/absorption spectra are observed for each phase [9][10][11][12][13][14][15][16][17]19,21,24]. Therefore, for identification of any H x Li 1−x NbO 3 phase in waveguides fabricated by other techniques, such as the case of our HiVac-VPE [1][2][3] or Reverse Proton Exchange [24], it is sufficient to use optical spectroscopy data.…”

Section: Introductionmentioning

confidence: 99%

Phase Composition of HiVac-VPE Lithium Niobate Optical Waveguides Identified by Spectroscopic Investigations

Rambu,

Kostritskii,

Fedorov

et al. 2024

Materials

View full text Add to dashboard Cite

High-index contrast lithium niobate waveguides, fabricated by the High Vacuum Vapor-phase Proton Exchange (HiVac-VPE) technique, are very promising for increasing both the optical nonlinear and electro-optical efficiencies of photonic integrated devices. So as to play this role effectively, it is mandatory to know the crystallographic phase composition of waveguides and the position of protonated layers for appropriate tailoring and optimization based on the intended applications. In addition, the estimation of structural disorder and electro-optical properties of the waveguides are also of high interest. Benefiting from Raman spectroscopy, IR reflection, IR absorption, and UV-VIS absorption, the HxLi1−xNbO3 phase compositions, as well as the structural disorder in waveguides, were determined. Based on experimental data on the shift of the fundamental absorption edge, we have quantitatively estimated the electro-optic coefficient r13 in as-exchanged waveguides. The electro-optical properties of the waveguides have been found to be depending on the phase composition. The obtained results allow for reconsidering the proton exchange fabricating process of photonic nonlinear devices and electro-optic modulators based on high-index contrast channel waveguides on the LiNbO3 platform.

show abstract

Phase composition of Z-cut protonated LiNbO3: a Raman study

Cited by 12 publications

References 11 publications

Anisotropic lattice changes in femtosecond laser inscribed Nd3+:MgO:LiNbO3 optical waveguides

Anisotropic lattice changes in femtosecond laser inscribed Nd3+:MgO:LiNbO3 optical waveguides

Detection of Two Phases Coexisting at the Phase Transition Temperature in LiNbO3 single crystal by using Raman Spectroscopy

Phase Composition of HiVac-VPE Lithium Niobate Optical Waveguides Identified by Spectroscopic Investigations

Contact Info

Product

Resources

About