Electric polarization induced by optical orientation of dipolar centers in non-polar piezoelectrics

Alexander I. Grachev; Alexei A. Kamshilin

doi:10.1364/OPEX.13.008565

Optics Express
Vol. 13,
Issue 21,
pp. 8565-8570
(2005)
•https://doi.org/10.1364/OPEX.13.008565

Electric polarization induced by optical orientation of dipolar centers in non-polar piezoelectrics

Alexander I. Grachev and Alexei A. Kamshilin

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Alexander I. Grachev and Alexei A. Kamshilin, "Electric polarization induced by optical orientation of dipolar centers in non-polar piezoelectrics," Opt. Express 13, 8565-8570 (2005)

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Abstract

We predict new nonlinear optical phenomenon, static electric polarization induced in non-polar piezoelectric by linearly polarized light owing to orientation of the impurity centers with permanent dipole moment. Microscopic model of this effect for the crystals of cubic symmetry is proposed. Estimations of the model show that the induced polarization might be much higher than that caused by optical rectification. It is shown that a transient current J_d generated under non-steady-state illumination could be observed at extremely high modulation frequency. We expect that the effect could be applied for ultrafast optical signal processing.

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Figures (1)

Fig. 1.

Fig. 1. Dipolar complexes within the unit cell of a crystal with zink-blende structure. Four possible orientations of A and D centers occupied near-neighbor positions are indicated by a through d. Blue and red atoms refer to two sublattices of the crystal structure. Inset on the left shows propagation direction of the light and its polarization vector, e.

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Equations (11)

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P_{i} = d_{ijk} (e_{j} e_{k}^{*} + e_{j}^{*} e_{k}) I

σ (θ) = σ_{∥} \cos^{2} θ + σ_{⊥} \sin^{2} θ,

\frac{{d N}_{1}}{d t} = \frac{- σ_{1} N_{1} I}{hv} + γn \frac{(N - {2 N}_{1})}{2} - Γ (N_{1} - N_{2}),

\frac{{d N}_{2}}{d t} = \frac{- σ_{2} N_{2} I}{hv} + γn \frac{(N - {2 N}_{2})}{2} + Γ (N_{1} - N_{2}),

\frac{d n}{d t} = \frac{(σ_{1} N_{1} + σ_{2} N_{2}) I}{hv - {γnN}_{A}^{0}},

N_{1} + N_{2} \geq N - (N_{A}^{0} + n) .

\frac{dΔ N}{d t} = \frac{(N_{1} + N_{2}) Δ σI}{2 hv} - \frac{N Δ N σ_{0} I}{hv N_{A}^{0} - 2 ΓΔ N},

Δ N_{ST} ≅ \frac{N Δ τ_{rel} I}{hv}

τ_{rel} = {(\frac{2 Γ + σ_{0} NI}{N_{A}^{0} hv})}^{- 1} .

J_{LPG} \approx \frac{{eN σ}_{0} l_{0} ζ^{ex} I}{hv},

\frac{d P}{d t} ≅ (\frac{Δ σNμ}{2 \sqrt{3} hv}) I (t)

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