Abstract

We report discovery of recently predicted phenomenon, optical orientation by polar way of local centers with permanent dipole moment. In a crystal of Bi12SiO20 grown in the argon atmosphere electrical current arises when the polarization of incident light is periodically modulated. Dependence of the current amplitude on the modulation frequency allows us to attribute this current to the predicted effect, which is supported by the data on light-induced dichroism and photoconductivity of the sample. A model of donor-acceptor pairs as dipolar centers is shown to be able to explain main peculiarities of optical orientation of dipolar centers in the crystal.

© 2007 Optical Society of America

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References

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  1. A. I. Grachev and A. A. Kamshilin, "Electric polarization induced by optical orientation of dipolar centers in non-polar piezoelectrics," Opt. Express 13, 8565 (2005).
    [CrossRef] [PubMed]
  2. R. Oberschmid, "Conductivity Instabilities and Polarization Effects of Bi12(Ge, Si)O20 single-Crystal Samples," Phys. Status Solidi A 89, 263 (1985).
    [CrossRef]
  3. B. I. Sturman and V. M. Fridkin, Photovoltaic and Photorefractive Effects in Noncentrosymmetric Materials (Gordon Breach, Philadelphia, Pa., 1992).
  4. E. V. Mokrushina, M. A. Bryushinin, V. V. Kulikov, A. A. Petrov, and I. A. Sokolov, "Photoconductive properties of photorefractive sillenites grown in an oxygen-free atmosphere," J. Opt. Soc. Am. B 16, 57 (1999).
    [CrossRef]

2005 (1)

1999 (1)

1985 (1)

R. Oberschmid, "Conductivity Instabilities and Polarization Effects of Bi12(Ge, Si)O20 single-Crystal Samples," Phys. Status Solidi A 89, 263 (1985).
[CrossRef]

J. Opt. Soc. Am. B (1)

Opt. Express (1)

Phys. Status Solidi A (1)

R. Oberschmid, "Conductivity Instabilities and Polarization Effects of Bi12(Ge, Si)O20 single-Crystal Samples," Phys. Status Solidi A 89, 263 (1985).
[CrossRef]

Other (1)

B. I. Sturman and V. M. Fridkin, Photovoltaic and Photorefractive Effects in Noncentrosymmetric Materials (Gordon Breach, Philadelphia, Pa., 1992).

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Figures (4)

Fig. 1.
Fig. 1.

(a) Configuration of the experimental setup, (b) Orientation of Bi12SiO20 crystal: electrodes are in the faces (110), the unit polarization vectors ek and ej make angle 330 with[001] and [1 1̄ 0] axes, respectively.

Fig. 2.
Fig. 2.

Dependencies of (a) the in-phase and (b) quadrature components of the Jd - current on the modulation frequency (ω/2π) measured at incident light intensity of 0.065 W/cm2 (squares), 0.13 W/cm2 (diamonds), and 0.26 W/cm2 (triangles). Laser beam was expanded to overlap the space between electrodes. RC of electrical circuit was about 7·10-7 s.

Fig. 3.
Fig. 3.

Dependence of light-induced dichroism on the pump intensity. The intensity of probe beam was 0.02 W/cm2. Both beams were focused into 1-mm2 area on the crystal surface. Arrows indicates incident light intensities in OODC experiments.

Fig. 4.
Fig. 4.

Frequency (ω/2π) dependencies of (a) the in-phase and (b) quadrature components of the photoconductive current at the light intensity of 0.065 W/cm2 (squares), 0.13 W/cm2 (diamonds), and 0.26 W/cm2 (triangles).

Equations (8)

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P i = d ijk ( e j e k * + e j * e k ) I ,
J d ( ω ) = I d τ d ( ω τ d 1 + ω 2 τ d 2 cos ω t ω 2 τ d 2 1 + ω 2 τ d 2 sin ω t ) .
d N 1 d t = σ 1 N 1 I + γ n ( N 2 N 1 ) 2 + Γ ( N 1 N 2 ) ,
d N 2 d t = σ 2 N 2 I h ν + γ n ( N 2 N 2 ) 2 + Γ ( N 1 N 2 ) ,
dn dt = ( σ 1 N 1 + σ 2 N 2 ) I h ν γ n N A 0 = ( σ 1 N 1 + σ 2 N 2 ) I h ν γ n 2 ,
N 1 + N 2 N ( N A 0 + n ) ,
dN D + dt = β ( N N D + ) η n N D + .
Δ N = Δ σ N D + τ d ( I h ν ) = Δ σ ( β N β + η σ 0 NI γ h ν ) ( 1 σ 0 ( I h ν ) + γ σ 0 N ( I h ν ) ) ( I h ν ) ,

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