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Three-dimensional photonic-crystal cavity with an embedded quantum dot as a nonclassical light emitter

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Abstract

In this paper, we introduce a hybrid three-dimensional photonic-crystal cavity with an embedded quantum dot, and investigate the dynamics of the cavity-quantum dot system. The general procedure of modelling such a practical structure is presented, where the master equation is solved on the basis of the parameters obtained from defect mode analyses. According to our study, this structure can be engineered to achieve a nearly deterministic single photon gun. The excitation power is found to have an optimal value in terms of photon emission efficiency. Large excitation pulse duration is believed to cause a spurious peak in the second-order coherence measurement.

©2004 Optical Society of America

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Figures (5)

Fig. 1.
Fig. 1. The schematic view of the photonic-crystal. The darker regions represent GaAs, and the brighter ones represent AlAs. Both a complete photonic-crystal (a) and the photonic-crystal cavity (b) are shown.
Fig. 2.
Fig. 2. Normalized amplitude of Ex of x-dipole mode in the central xy-plane where the quantum dot is located (a) and in a vertical slice with respect to y axis (b). The frequency of the mode is a/λ=0.263. The structural parameters are as follows: p=8a/15, s=16a/15, the refractive index nGaAs=3.57 and nAlAs=2.94.
Fig. 3.
Fig. 3. The average photon number detected during time interval from 0 to t. The parameters are (g, κ, γ0 , r 0)=(441,1678,0.56,500) GHz and 2T 0=3 ps.
Fig. 4.
Fig. 4. Dependence of the saturation value p(+∞) on peak pump rate r 0 with 2T 0=3 ps and 6 ps.
Fig. 5.
Fig. 5. The pulse duration dependence of P max

Equations (16)

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V = ∫∫∫ ε ( r ) E ( r ) 2 d 3 r max [ ε ( r ) E ( r ) 2 ] ,
g = μ ħ ħ ω 2 εV = γ 0 2 V 0 V ,
H = ħ g ( σ a + a σ ) + ħ r ( t ) ( σ + σ ) ,
d dt ρ = i ħ [ H , ρ ] + κ ( 2 a ρ a a ρ a a ) + γ 2 ( 2 σρ σ σ σρ ρσ σ )
P ( t ) 2 κ 0 t a ( τ ) a ( τ ) d τ
r ( t ) = r 0 exp { ( t 3 T 0 ) 2 T 0 2 }
H = H iħκ a a γ 0 2 σ σ .
ψ ( t ) = a 1 ( t ) G , 0 + a 2 ( t ) X , 0 + a 3 ( t ) G , 1 ,
i a ˙ 1 = r ( t ) a 2
i a ˙ 2 = r ( t ) a 1 + g a 3 i γ 0 2 a 2
i a ˙ 3 = g a 2 i κ a 3 ,
a 3 g a 2
a 2 { sin ( r 0 t ) t < T sin ( r 0 T ) exp { ( g 2 κ + γ 0 2 ) t } t T
a 1 i 0 t r ( t ) a 2 ( t ) d t .
P ( t ) 2 κ 0 t a 3 ( t ) 2 d t sin 2 ( r 0 T ) F F + 1 { 1 exp [ ( 2 g 2 κ + γ 0 ) t ] }
P ( t ) g 2 (κ γ 0 )1 t+ sin 2 ( r 0 T )
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