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- CdSe/ZnS

: 01.04.10 ­

-

- 2008


. .. . : - , ..

:

- , .. - , ..

:

- ( )

22 2008. 1700 . 501.001.70 . .. : 119992, -2, . , , 1, . .. , , - . . .. « » 2008 .

501.001.70 . .. , ,

..

2


. , () - . . . -. . , , . , , , ­ , , . , , . -. , . . - . . 1. CdSe/ZnS . 2. , , CdSe/ZnS - .
3


3. CdSe/ZnS. : 1. CdSe/ZnS ( ) . 2. CdSe/ZnS , , . 3. , CdSe/ZnS, . , (-) . . , , . , , . , ( , , ..). : . ,
4


CdSe/ZnS, . , CdSe/ZnS, . , (-) . . . . - , . . . "Nanostructures: Physics and Technology" (, 2006, , 2007), "Excitons and Exciton Condensates in Confined Semiconductor Systems" (, 2006), « . » (, 2006, 2007), "Tenth International Meeting on the Optics of Excitons in Confined Systems" (Messina ­ Patti, Italy, 2007), VIII (, 2007), "ICONO/LAT 2007" Minsk, Belarus. . , , 3 8 , . , , . . , , . 90 , 33 . 71 .

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. , , , . . , - . , CdSe/ZnS 1S3/2(h)1S(e) . , , . , , CdSe/ZnS 1017 -3. CdSe/ZnS 0.8 0.8 Nd3+:YAG0.6 (=1,165 ), 0.4 0.4 0.2 , , 0.0 2.0 2.2 2.4 2.6 , . .1 .1 CdSe/ZnSe ( = 300 ). - . 2,5 ± 0,3 Nd3+:YAG-. - 1S3/2(h)1S(e) ( ) CdSe [1]. 80 1S3/2(h) - (..)



6


, , [2]. ( ) . 1S(e) , . .1, CdSe/ZnS ( ). 2,5 ( 1S3/2(h)1S(e)). , , , n = 0 l = 0 ( n l - ) n = 1 / l = 2 . l = 1 . CdSe/ZnS. . . CdSe/ZnS . () . Nd3+:YAG-, ( ­ 30 , ­ 7 ), 1 CdSe/ZnS, 3 ( ) (19), 7-19. (±5 ) . CdSe/ZnS .2. , , , . , . , -, - .
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.2. CdSe/ZnS .

5

I0/I

4 3 2 5 10 15 20 25 30 35 40

I0,/2
.3 I0/I I0, I I0 . - (2), ­ (4) ( ).

- , . (I0/I) (I0) (.3). . 2 I0<20 / I0/I . . , . [3,4]: (1) - . (1) , L :

dI / dz = -I - I 2 ,

I0 e L (e L - 1) = + I0 = A + B I0 , I (1 - R ) (1 - R) 2
0, B L .
8

(2)


R ­ L 2 . e /(1 - R ) 1,1 . .3 (2). .4. - CdSe/ZnSe (3) . CdSe/ZnS (3) 17 -3 22 2 -13 3 10 : = 0,8 ± 0, 2 /; Im c n /(32 ) 310 -1. . , 25/2 (.3), , . , , :



dI dz = -I - I 2 - H I ,
H

(3)

- , -

H N ( N - 2 ). , H N I . (3)
,
H

= I 2 :

I + I 0 I0 + I - ln = 1 + LI o + 0 ln . (4) I0 I I (3, ). , . =0,004±0,00053/2. , .
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1) , , (4). 2) , , , , , . , , , . . , . (. 2.), , , . .

I 0 >>



(1 - R )

(1 - e

-L -1

)

(5)

I0.

I

max

=

(1 - R) (eL - 1)

(6)
max

L << 1 , I



1- R L . ,

- . , , 12 /2 ( 1017-3). L=1, R=0,04 , (.3.). CdSe/ZnS . . . CdSe/ZnS .4. . , 10


, . , , . II, . ( ) . - n ( : n <0) . , . ( n ), -, - . , [5-7]: n n b + n f (7) 2 (3) 2 n b = I 0 , = 12 Re / cn0 ( n0 - ). , , n = I 0 . . f n . CdSe/ZnS (. 4.) ( n < 0 ). , -, . , I , , <0 <0. (.5) , f 2

2 n = n0 - I - I . -

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. 40 , 35 30 . 25 20 15 10 5 0 0 5 10 15 20 25 30 . 2 I0,/ , .5. , ( I0/I I0) CdSe/ZnS . ( ) . . , . III 0.8 0.7 CdSe/ZnS. I0/I I0 0.6 I II 0.5 = -1,6·10 -18 2 -1 0.4 ( Re (3) -7 10 -10 3 -1 ) 0.3 = -2,0·10 -36 4 2 -2 . 0.2 0.4 0 .8 1.2 1 .6 , / 2 .6. CdSe/ZnS (W) . CdSe/ZnS . ,
W

I0/I

12


, , . CdSe/ZnS 1017 -3. 1S3/2(h)1S(e). , . .6. (W) . , , . . .6. .7. - . , - CdSe/ZnS (photo . darkening). . . , CdSe/ZnS, (.6.). . 1 . (.7.). . , , , .
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, L ( F=25) 18 23 ( ) 2 , , , . , , . . 1) . . 2) (-). , . «» (-) [8,9]. . . , , , . . ­ . , . , ( , , ). , , , . ( -). ( I .6.) , , .6. , . :

dI I =- 0 I - I, dz 1+ c I sat
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(8)


0 ( I 0 ) , , I scat - (c ) . I sat 0.8 0.7 . 0.6 0.5 0.4 0.3 0.2 0.1 0.0 [3]: I s = 1 / 2 . 0.4 0.8 1.2 1.6 2.0 , /2 .8. () , I scat (8) ( ) (10) ( ) . CdSe/ZnS . (8) . .8. . [10,11], ( - ) . . , , . - . 1.3 /2 ( II .6.), -, , , . :



Is = I

c sat

+ I

2 0

,

(9)

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.. I s . (8) dI I =- 0 I - . (10) I dz 1+ c I sat + I 2 CdSe/ZnS (.8.). .6 7. , -, : - (strip effect), . , , . , , CdSe/ZnS (W) . , , , -, CdSe/ZnS (W) , .6. 1.7 /2 ( III .6.), . , -, , , , .
-1

: CdSe/ZnS . . , CdSe/ZnS, . 16










. , CdSe/ZnS, . , , . , . . , CdSe/ZnS, . , (-) . dSe/ZnS . , ( 23 50 0 ) ( E g ) , , . . :

1. V.S.Dneprovskii, D.A.Kabanin, V.L.Lyaskovskii, T.Wumaier and E.A.Zhukov "Nonlinear absorption and refraction of CdSe/ZnS quantum dots at two-photon resonant excitation" Pros. 14th Int. Symposium "Nanostructures:physics and technology ". St.Peterburg, Russia, 2006, p. 142-143. 2. V.S.Dneprovskii, V.L.Lyaskovskii, T.Wumaier and E.A.Zhukov "Nonlinear absorption and refraction of CdSe/ZnS quantum dots at one- and two-photon resonant excitation of excitons" Abstracts of Russion-Swiss Se minar "Excitons and Exciton Condensates in Confined Se miconductor Systems". Moscow, Russia, 2006, p. 18.
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3. .. , .. , .. , . « CdSe/ZnS », , « . » .73-76, 2006. 4. .., .., .., .., .., . « CdSe/ZnS » . 49, 2, 352-356, 2007. 5. . , .. , .. , .. , « CdSe/ZnS », , « . » .52-55, 2007. 6. V.S. Dneprovskii, D.A. Kabanin, V.L. Lyskovskii, T. Wumaier, E.A. Zhukov "Anomalous resonant nonlinear absorption of excitons in CdSe/ZnC quantum dots" Phys. Stat. Sol.(), v.5, 5, 2008. 7. V.S.Dneprovskii, D.A.Kabanin, V.L.Lyaskovskii, T.Wumaier, E.A.Zhukov "Nonlinear absorption and refraction of CdSe/ZnC quantum dots at two-photon resonant excitation of excitons". Phys. Stat. Sol.(), v.5, 5, 2008. 8. V.S. Dneprovskii, D.A. Kabanin, V.L. Lyaskovskii, T. Wumaier, and E.A. Zhukov "Anomalous saturation of CdSe/ZnS quantum dots: the effect of intensity dependent exciton lifetime" Pros. 15th Int. Symposium "Nanostructures:physics and technology ". Novosibirsk, Russia, 2007, p. 220-221. 9. .., .., .., .., . « CdSe/ZnS » VIII (, 2007). , .287. 10. .., .., .., .., . « CdSe/ZnS» VIII (, 2007). , .288. 11.V.S. Dneprovskii,D.A. Kabanin, V.L.Lyaskovskii, T.Wumaier, and E.A.Zhukov "The peculiar nonlinear absorption of CdSe/ZnS quantum dots in the case of resonant excitation of excitons by ultrashort laser pulses". "ICONO/LAT 2007 ". Minsk, Belarus, p. 88.

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