Acoustic waves effects on raman spectra of piezoelectric crystals

Vtyurin, A. N.; Schäfer, André; Krylov, A. S.

doi:10.1080/00150199508014207

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…For that purpose, we used a modulation detection scheme similar to the ones described in Ref. 9. In this approach, both the excitation laser and the rf-power for SAW generation are on/off amplitude modulated at a frequency of 617 Hz.…”

Section: Methodsmentioning

confidence: 99%

“…To our knowledge, only few approaches for active control of optical phonons have so far been proposed. One example is the modulation of the optical modes in strongly piezoelectric materials by an acoustic wave: 9 here, the anisotropic strain field created by the sub-MHz bulk acoustic wave has been shown to reduce the crystal symmetry, thus introducing changes in the Raman scattering from optical phonons.…”

Section: Introductionmentioning

confidence: 99%

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Optical phonon modulation in semiconductors by surface acoustic waves

et al. 2016

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We investigate the modulation of optical phonons in semiconductor crystal by surface acoustic wave (SAW) propagating on the crystal surface. The SAW fields induce changes on the order of 10 -3 in the average Raman scattering intensity by optical phonons in Si and GaN crystals. The SAWinduced modifications in the Raman cross-section are dominated by the modulation of the optical phonon energy by the SAW strain field. In addition to this local contribution, the experiments give evidence for a weaker and non-local contribution arising from the spatial variation of the SAW strain field. The latter is attributed to the activation of optical modes with large wave vectors and, therefore, lower energies. The experimental results, which are well described by theoretical models for the two contributions, prove that optical phonons can be manipulated by SAWs with µm wavelengths.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical phonon modulation in semiconductors by surface acoustic waves

et al. 2016

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“…11 Anisotropic deformations and orientation disorder in crystal structure lead to the appearance of new lines in piezoelectric crystals. 12,13 Violation of Raman selection rules can be induced under resonant and coherent pumping of two-phonons femtosecond laser pulses 14 or by the inhomogeneous strain caused by mechanical polishing. 15 Even the vibrational Raman spectrum of quartz demonstrates the raising of new lines introduced by birefringence and anisotropy.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the additional lines in Cr 3+ ‐doped MgAl 2 O 4 spinel were attributable to impurity resonant Raman effects when the impurity site symmetry was lower than the host lattice symmetry 11 . Anisotropic deformations and orientation disorder in crystal structure lead to the appearance of new lines in piezoelectric crystals 12,13 . Violation of Raman selection rules can be induced under resonant and coherent pumping of two‐phonons femtosecond laser pulses 14 or by the inhomogeneous strain caused by mechanical polishing 15 .…”

Section: Introductionmentioning

confidence: 99%

Temperature Raman study of Li₄Ti₅O₁₂ and ambiguity in the number of its bands

Nikiforov,

Krylov,

Krylova

et al. 2023

J Raman Spectroscopy

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The two primary physical methods for identifying lithium titanate, a negative electrode material used commercially, are X‐Ray diffraction and Raman spectroscopy. Although there are many publications on this topic, they are focused mainly on chemistry, so there are still some points that require clarification from a physical and methodological point of view. Difference of experimentally observed and theoretically predicted Raman spectra was explained through a combination of experiments and computations. The work comprises experiments and computations to explain why there are different numbers of predicted and observed Raman‐active bands. Our low‐temperature study and the analysis of thermal shifts during heating led us to conclude that the approach with surplus bands is advantageous and we recommend using major F2g band shifts to estimate the sample heating.

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