Space-charge fields in photorefractive materials enhanced by moving fringes: comparison of electron–hole transport models

Aubrecht, Ivo; Ellin, H. C.; Grunnet‐Jepsen, A.; Solymár, L.

doi:10.1364/josab.12.001918

Cited by 17 publications

(8 citation statements)

References 18 publications

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“…photorefractives. The existence of similar resonance peaks for hole-donor photoactive centers have been theoretically predicted 20 and also experimentally detected. 21 However, the characterization of simultaneous hole-and electron-based photorefractive running holograms has always been a difficult task because of the large number of parameters to be handled and the different effects (wave coupling, electric coupling, light absorption effect on the response time and even optical activity and birrefringence [22][23][24][25][26] ) to be considered.…”

Section: Introductionsupporting

confidence: 60%

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Detection of resonance space-charge wave peaks for holes and electrons in photorefractive crystals

Oliveira

Frejlich

2007

J. Opt. Soc. Am. B

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We report nonstationary photorefractive holograms in absorbing Bi 12 TiO 20 samples with different degrees of hole-electron competition exhibiting resonance peaks due to electron and hole charge carriers. One sample with moderate hole-electron competition and another with a much larger effect were studied. Experimental data from these samples were analyzed using a theoretical model accounting for electrical hole-electron coupling, wave coupling, and response-time variation along the sample thickness due to bulk light absorption. Comparing experimental data and theoretical results allows finding out material parameters adequately describing hole and electron photoactive centers in these samples.

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Section: Introductionsupporting

confidence: 60%

“…A set of independent rate equations is therefore written for electrons and for holes where the electrical coupling arises from the Poisson equation. Following the formulation by Aubrecht et al 20…”

Section: Theorymentioning

confidence: 99%

Detection of resonance space-charge wave peaks for holes and electrons in photorefractive crystals

Oliveira

Frejlich

2007

J. Opt. Soc. Am. B

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“…However, the domain motion may possibly be explained as the group velocity associated with spatial space-charge wave packets. It is well established that the dispersion relation for space-charge waves around a space-charge resonance is approximately of the form ␦ ϳ A/K, 6,12 where ␦ is the frequency shift, K is the wave vector of the grating, and A is a constant collecting the material parameters. The phase velocity is V ph ϭ ␦/K, which in our case corresponds to the velocity of the intensity fringes V ph ϭ V f .…”

Section: Discussionmentioning

confidence: 99%

“…When a photorefractive Bi 12 SiO 20 (BSO) crystal is illuminated with two plane waves with a small frequency offset, spontaneous beams (termed spatial subharmonics) may occur under the right combination of experimental conditions. [1][2][3][4] The collimated nature and the direction of propagation of these beams suggest diffraction of the incident (writing) beams in photorefractive gratings with a grating period equal to an integer times that of the primary grating recorded by the two incident beams.…”

Section: Introductionmentioning

confidence: 99%

Dynamic spatial structure of spontaneous beams in photorefractive bismuth silicon oxide

et al. 1996

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We report the domain structure of spontaneously occurring beams (subharmonics) in photorefractive bismuth silicon oxide with an applied electric field from 1 to 6 kV/cm and a running grating. The subharmonic beams are generated in a pattern of domains that evolve dynamically as they move through the crystal. We find that the domains move as a whole with a speed approximately equal to that of the primary grating, but in the opposite direction. The domains are separated by narrow boundary regions, where the phase of the subharmonic waves changes by . The domain motion is consistent with the group velocity for running space-charge waves.

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“…Thus, the e À h competition is harmful for SCWs. This is in line with e À h models of the DC enhancement [90].…”

Section: Two Generalizationssupporting

confidence: 89%

Space-Charge Wave Effects in Photorefractive Materials

Sturman

Springer Series in Optical Sciences

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This chapter provides the first systematic description of the basic properties of low-frequency space-charge waves (SCWs) in photorefractive materials, and the effects caused by these weakly damped eigen-modes. The basic properties incorporate the dependences of the wave frequency and damping on the wavevector, and the restrictions on the material parameters necessary to ensure weakness of the wave damping. The unifying feature of the SCW effects is their resonant character. These effects include the known DC and AC enhancement of the photorefractive response (treated as the linear resonance), the subharmonic generation (treated as parametric excitation of SCWs), the low-frequency peculiarities of the nonlinear response, and also a number of effects caused by the joint action of the optical and material nonlinearities. While an exposition of the concepts lies at the center of this chapter, it also gives a review of experimental studies relevant to the subject matter and a historical sketch.

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Space-charge fields in photorefractive materials enhanced by moving fringes: comparison of electron–hole transport models

Cited by 17 publications

References 18 publications

Detection of resonance space-charge wave peaks for holes and electrons in photorefractive crystals

Detection of resonance space-charge wave peaks for holes and electrons in photorefractive crystals

Dynamic spatial structure of spontaneous beams in photorefractive bismuth silicon oxide

Space-Charge Wave Effects in Photorefractive Materials

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