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Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 10 — May. 12, 2008
  • pp: 6999–7005
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Three-photon absorption in semiconductor quantum dots: experiment

Xiaobo Feng, Yu Long Ang, Jun He, Cyrus W. J. Beh, Hairu Xu, Wee Shong Chin, and Wei Ji  »View Author Affiliations


Optics Express, Vol. 16, Issue 10, pp. 6999-7005 (2008)
http://dx.doi.org/10.1364/OE.16.006999


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Abstract

The four-band model, derived under the effective-mass approximation for cubic semiconductor quantum dots (QDs), is compared with experimental measurements on frequency degenerate three-photon absorption (3PA) in CdSe QDs and ZnS QDs. Qualitatively, the model provides the correct prediction on the magnitude of the 3PA cross-sections, which are in the range from 10-79 to 10-77 cm6s2photon-2 in the light frequency region of interest. More noticeably, the theoretical conclusion of an increasing tendency in the 3PA cross-sections with increasing dot-size is in agreement with the experiment. The discrepancy is also found for smaller QDs (dot-radius is less than one-third of the exciton Bohr radius), which is attributed to neglecting the mixing among the three valence bands in the theory.

© 2008 Optical Society of America

1. Introduction

Recently, semiconductor quantum dots (QDs), or nanocrystals (NCs), have received considerable attention due to their potential applications in optical limiting, bio-labels, biosensors and imaging agents [1–4

1. X. Michalet, F. F. Pinaud, L. A. Bentolila, J. M. Tsay, S. Doose, J. J. Li, G. Sundaresan, A. M. Wu, S. S. Gambhir, and S Weiss, “Quantum Dots for Live Cells, in Vivo Imaging, and Diagnostics,” Science 307, 538 (2005). [CrossRef] [PubMed]

], employing two-photon absorption (2PA) or three-photon absorption (3PA). Compared with 2PA, longer excitation wavelengths may be utilized in 3PA-based applications to provide deeper penetration depths in absorptive media and higher spatial resolution [5

5. F. E. Hernandez, K. D. Belfield, and I. Cohanoschi, “Three-photon absorption enhancement in a symmetrical charge transfer fluorene derivative,” Chem. Phys. Lett. 391, 22 (2004). [CrossRef]

, 6

6. F. E. Hernandez, K. D. Belfield, I. Cohanoschi, M. Balu, and K. J. Schafer, “Three- and Four-Photon Absorption of a Multiphoton absorbing Fluorescent Probe,” Appl. Opt. 43, 5394 (2004). [CrossRef] [PubMed]

]. A better understanding of 3PA in semiconductor QDs should be of direct relevance to 3PA-based applications. By extending Federov’s model [7

7. A. V. Fedorov, A. V. Baranov, and K. Inoue, “Two-photon transitions in systems with semiconductor quantum dots,” Phys. Rev. B. 54, 8627 (1996). [CrossRef]

], we have developed a four-band model for the frequency degenerate 3PA of cubic semiconductor QDs or NCs. To validate the model, we present here the comparison between the model and experimental measurements on the frequency degenerate 3PA cross-sections of CdSe QDs and ZnS QDs.

The 3PA in semiconductor QDs was first reported on CdS QDs. With femtosecond pulsed excitation, Chon and his co-workers [8

8. J. W. M. Chon, M. Gu, C. Bullen, and P. Mulvaney, “Three-photon excited band edge and trap emission of CdS semiconductor nanocrystals,” Appl. Phys. Lett. 84, 4472 (2004). [CrossRef]

] measured the three-photon-excited band-edge and trap-state emission from CdS QDs in solution, and they concluded that the 3PA cross-sections should be ~10-79 cm6s2photon-2. However, there was uncertainty in their measurements since the three-photon-excited photoluminescence efficiency was assumed. The first unambiguous measurement on the 3PA cross-section of ZnS QDs of 1.3-nm radius was made by He, et al., [9

9. J. He, W. Ji, J. Mi, Y. Zheng, and J. Y. Ying, “Three-photon absorption in water-soluble ZnS nanocrystals,” Appl. Phys. Lett. 88, 181114 (2006). [CrossRef]

] who applied both Z-scan and transient transmission techniques with 120-fs laser pulses to determine it to be ~10-78 cm6s2photon-2 at 780 nm. Very recently, 3PA of CdSe QDs in hexane solution of five different dot-sizes was investigated systematically with femtosecond laser pulses [4

4. G. S. He, K. T. Yong, Q. D. Zheng, Y. Sahoo, A. Baev, A. I. Ryasnyanskiy, and P. N. Prasad, “Multi-photon excitation properties of CdSe quantum dots solutions and optical limiting behavior in infrared range,” Opt. Express 15, 12818 (2007). [CrossRef] [PubMed]

]. It is also noticed that Lad, et al., experimentally studied the 3PA in ZnSe QDs and ZnSe/ZnS core-shell QDs with picosecond laser pulses [10

10. A. D. Lad, P. P. Kiran, G. R. Kumar, and S. Mahamuni, “Three-photon absorption in ZnSe and ZnSe/ZnS quantum dots,” Appl. Phys. Lett. 90, 133113 (2007). [CrossRef]

].

2. Experiment

Following Federov’s model [7

7. A. V. Fedorov, A. V. Baranov, and K. Inoue, “Two-photon transitions in systems with semiconductor quantum dots,” Phys. Rev. B. 54, 8627 (1996). [CrossRef]

], we have derived the following analytical expression for the frequency degenerate 3PA cross-sections, σ 3, for ZnS and CdSe QDs, with the Lifshits-Slezov size distribution [11

11. I. M. Lifshits and V. V. Slezov, “The kinetics of diffusional decomposition of super-saturated solid solutions,” Zh. Eksp. Teor. Fiz 35, 479 (1958).

].

σ3=6πħ2ω3εω32(8πe23ω2c)3(Pħ)2j=13Fc,hj,
(1)

where

Fc,hj=12Δhjβ1,β2,β0(l2δl2,l0+1+l0δl2,l01)(l1δl1,l2+1+l2δl1,l21)
×Tβ1,β2,β0c,hj(Rβ1;β0(hj))ξβ24ξβ02ξβ12(ξβ22ξβ02)2(ξβ12ξβ22)2f(Rβ1;β0(hj))(Rβ1;β0(hj))3.
(2)

Table 1. Parameters used in the Calculations for the Investigated Materials

table-icon
View This Table

2.1 3PA Cross-Sections of CdSe Quantum Dots

Fig. 1. The 3PA cross-section plotted as a function of the dot diameter for CdSe QDs with the three-photon excitation wavelength of ~1300 nm. The solid line is our theoretical calculation. The solid squares are the data measured by He, et al. [4].

The 3PA cross-sections calculated at the wavelength of 1300 nm for CdSe QDs as a function of the average diameter are shown in Fig. 1. It is evident that the overall magnitude of the 3PA cross-section increases with increasing QD diameter, in agreement with the case of two-photon absorption (2PA) [14

14. L. A. Padilha, J. Fu, D. J. Hagan, E. W. Van Stryland, C. L. Cesar, L. C. Barbosa, C. H. B. Cruz, D. Buso, and A. Martucci, “Frequency degenerate and nondegenerate two-photon absorption spectra of semiconductor quantum dots,” Phys. Rev. B 75, 075325 (2007). [CrossRef]

, 15

15. L. A. Padilha, J. Fu, D. J. Hagan, E. W. Van Stryland, C. L. Cesar, L. C. Barbosa, and C. H. B. Cruz, “Two-photon absorption in CdTe quantum dots,” Opt. Express 13, 6460 (2004). [CrossRef]

]. For comparison, we re-plot the experimental results by He, et al., [4

4. G. S. He, K. T. Yong, Q. D. Zheng, Y. Sahoo, A. Baev, A. I. Ryasnyanskiy, and P. N. Prasad, “Multi-photon excitation properties of CdSe quantum dots solutions and optical limiting behavior in infrared range,” Opt. Express 15, 12818 (2007). [CrossRef] [PubMed]

] for CdSe QDs with the three-photon excitation wavelength of ~1300 nm. Notice that the 3PA coefficient per QD, σ 3′ is defined as σ 3′=α 3/N in Ref. [4

4. G. S. He, K. T. Yong, Q. D. Zheng, Y. Sahoo, A. Baev, A. I. Ryasnyanskiy, and P. N. Prasad, “Multi-photon excitation properties of CdSe quantum dots solutions and optical limiting behavior in infrared range,” Opt. Express 15, 12818 (2007). [CrossRef] [PubMed]

], where α 3 and N are the 3PA coefficient of the solution and the QD density, respectively. In Fig. 1, we convert it to the 3PA cross-section by the definition of σ 3=(ħω)2 α 3/N. As seen from Fig. 1, the theory predicts an increasing tendency in the 3PA cross-sections with the increase in the dot-diameter, though it does not increase monotonously. This is consistent with the measurement. Within the experimental errors, a good agreement between the experimental data and the theory can be found, for CdSe QDs of larger diameters (2R 0=~3.9 and ~3.4 nm). Notice that the exciton Bohr diameter is 2a B=9.8 nm. Thus, the good agreement can be reached for CdSe QDs with dot’s diameter being greater than 2a B/3 (=3.3 nm).

For smaller diameters (less than 2a B/3=3.3 nm), however, the discrepancy exists, similar to the finding for 2PA in QDs [14

14. L. A. Padilha, J. Fu, D. J. Hagan, E. W. Van Stryland, C. L. Cesar, L. C. Barbosa, C. H. B. Cruz, D. Buso, and A. Martucci, “Frequency degenerate and nondegenerate two-photon absorption spectra of semiconductor quantum dots,” Phys. Rev. B 75, 075325 (2007). [CrossRef]

, 15

15. L. A. Padilha, J. Fu, D. J. Hagan, E. W. Van Stryland, C. L. Cesar, L. C. Barbosa, and C. H. B. Cruz, “Two-photon absorption in CdTe quantum dots,” Opt. Express 13, 6460 (2004). [CrossRef]

]. It was revealed by Padilha, et al., [15

15. L. A. Padilha, J. Fu, D. J. Hagan, E. W. Van Stryland, C. L. Cesar, L. C. Barbosa, and C. H. B. Cruz, “Two-photon absorption in CdTe quantum dots,” Opt. Express 13, 6460 (2004). [CrossRef]

] that the mixing of the three valence bands is of importance to smaller QDs. If such mixings are considered and included in a k⃗·P⃗ model, an excellent agreement can be reached for the 2PA in smaller QDs. Similarly, we anticipate the mixing should also play an important role in the 3PA of smaller QDs. And the calculation based on the k⃗·P⃗ model is under way.

2.2 3PA Cross-Sections of ZnS Quantum Dots

To investigate the 3PA cross-sections of ZnS QDs, we freshly prepared the QDs with method described in the following. Precursor of ZnS QDs was prepared by reacting thiobenzoic acid with sodium carbonate and zinc nitrate. Thioglycolic acid (20X capping agent) of 420mL was added to 5mL water. The pH value was adjusted to approximately 11~12 by addition of base (~5mL 2M potassium hydroxide or sodium hydroxide). 0.103g precursor was then dissolved in the reaction mixture, and heated to 100 °C after degassing and filling the reaction set-up with nitrogen gas. After 30 minutes the reaction was stopped by placing the reaction mixture into an ice bath. The pH value was readjusted back to around 7 by addition of acid so as to reduce the QD solubility in water, thereby increasing the ease of precipitation. The reaction mixture was then left to stand for 7 days to allow the aggregation of smaller crystals into larger ones. 2-propanol was then added until turbidity was observed and the mixture was centrifuged. The precipitate was washed with 2-propanol and dried under vacuum. The pellet of the QDs was vacuum-dried at room temperature overnight, and the final product in the powder form could be re-dissolved in water.

Fig. 2. UV-VIS one-photon absorption (thick solid line:—) spectrum, together with the Gaussian fitting bands (dotted lines:⋯), of the ZnS QDs. The inset shows the PL (dashed line:---) spectrum excited at 230 nm.

With a UV-visible spectrophotometer (Shimadzu, UV-1700), the one-photon absorption spectrum of the thioglycol-capped ZnS QDs in aqueous solution was recorded and is shown in Fig. 2. Both sharp optical absorption edge and well-defined excitonic feature are indicative of a narrow size distribution of the QDs. The 1.3-nm size of the ZnS QDs was estimated by the calculation based on effective mass approximation [16

16. Y. Nosaka, “Finite depth spherical well model for excited states of ultrasmall semiconductor particles: an application,” J. Phys. Chem. 95, 5054 (1991). [CrossRef]

] and realistic tight binding calculation [17

17. R. Viswanatha, S. Sapra, T. Saha-Dasgupta, and D. D. Sarma, “Electronic structure of and quantum size effect in III–V and II–VI semiconducting nanocrystals using a realistic tight binding approach,” Phys. Rev. B 72, 045333 (2005). [CrossRef]

]. Broadening of the excitonic transition is primarily due to the inhomogeneity arising from size dispersion. A size distribution of ~8% can be estimated with the 520-meV width of the excitonic transition of 1S(e)-1S3/2(h) observed in Fig. 2. The inset of Fig. 2 displays two PL emission bands (peaked at 350 and 450 nm), recorded by a Jasco FP-6300 spectrofluorometer for the ZnS QDs. The PL emission peak at 350 nm, which is red-shifted compared to the excitonic transition (~232 nm), is consistent with the observation by Kumbhojkar, et al., [18

18. N. Kumbhojkar, V. V. Nikesh, A. Kshirsagar, and S. Mahamuni, “Photophysical properties of ZnS nanoclusters,” J. Appl. Phys. 88, 6260 (2000). [CrossRef]

] and Sapra, et al., [19

19. S. Sapra, A. Prakash, A. Ghangrekar, N. Periasamy, and D. D. Sarma, “Emission Properties of Manganese-Doped ZnS Nanocrystals,” J. Phys. Chem. B 109, 1663 (2005). [CrossRef]

] for un-doped ZnS QDs. The change of excitation wavelength only led to the alteration in the intensity of the emission peaks. The strong emission bands could be attributed to the carrier recombination of the sulfur defect states, which are mostly on the surface of the QDs [16

16. Y. Nosaka, “Finite depth spherical well model for excited states of ultrasmall semiconductor particles: an application,” J. Phys. Chem. 95, 5054 (1991). [CrossRef]

, 19

19. S. Sapra, A. Prakash, A. Ghangrekar, N. Periasamy, and D. D. Sarma, “Emission Properties of Manganese-Doped ZnS Nanocrystals,” J. Phys. Chem. B 109, 1663 (2005). [CrossRef]

].

The room-temperature 3PA of the ZnS QDs in aqueous solution was investigated with a standard Z-scan technique [20

20. M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, and E. W. Van Stryland, “Sensitive measurement of optical nonlinearities using a single beam,” IEEE J. Quantum Electron. 26, 760 (1990). [CrossRef]

]. The 1-mJ, 1-kHz, 120-fs laser pulses were generated by a Ti:Sapphire regenerative amplifier (Quantronix, Titan), which was seeded by an erbium-doped fiber laser (Quantronix, IMRA). The wavelengths were tunable as the laser pulses passed through an optical parametric amplifier (Quantronix, TOPAS). The spatial distribution of the pulses was nearly Gaussian, after passing through a spatial filter. The high quality of the Gaussian beam was confirmed by the M2-factor measurement, showing that the value of M2 was close to the unity. The laser beam was divided by a beam splitter into two parts. The reflected part was taken as the reference representing the incident laser power and the transmitted beam was focused with a lens (f=25 cm) onto the ZnS aqueous solution which was placed in a 10-mm-thick quartz cell. Two light power probes (Laser Probe, RkP-465 HD) were used to record both the incident and transmitted laser power simultaneously. A computer-controlled translation stage was employed to move the cell along the propagation direction (Z-axis) of the laser pulses. For the open-aperture (OA) Z-scans, extreme care was taken to ensure the entire collection of the transmitted light, and thus, self-lensing effects were eliminated.

It should be pointed out that the ZnS QDs possessed the high photostability in aqueous solution with high-power laser pulses because their one-photon absorption and PL spectra were measured before and after the pulsed laser irradiation; no measurable difference was observed. For calibration, similar 3PA measurements were conducted on a 0.5-mm-thick cubic ZnS bulk crystal (Semiconductor Wafer, Inc.) with laser polarization perpendicular to its <111> axis. All the Z-scans reported here were performed with excitation irradiances below the damage threshold.

TOA=1πp0ln[1+p02exp(2x2)+p0exp(x2)]dx
(3)

where p0=2α3I02Leff , I 0=I 00/(1+z 2/z 2 0) is the excitation intensity at position z, z 0=πw 2 0/λ is the Rayleigh range, w 0 is the minimum beam waist, λ is the laser free-space wavelength, Leff=1exp(2α0L)2α0 is the effective sample length, α0 is the linear absorption coefficient, and L is the sample length. The 3PA coefficient α 3 can be extracted by fitting Eq. (3) to the OA Z-scan curves. Finally, the 3PA cross-section (σ 3) can be inferred from σ 3=(ħω)2 α 3/N. Note that the large experimental errors result primarily from the uncertainty in determining the density of the ZnS QDs in solution.

Fig. 3. Typical open-aperture Z-scans at 700 nm for the ZnS QDs. The symbols denote the experimental data while the solid lines are theoretically fitted curves employing the Z-scan theory described in the text. The inset shows the Z-scan curves for the ZnS bulk crystal.
Fig. 4. 3PA cross-sections calculated as a function of the wavelength for ZnS QDs. The solid squares are the experimental data.

The measured 3PA cross-section spectrum for the 1.3 nm-sized water-soluble ZnS QDs is shown in Fig. 4. For comparison, the theoretical calculations are also presented. Obviously, a good agreement is found between the theory and the experiment within the experimental errors. The magnitude of the 3PA cross-sections that we calculated and measured is at least one order larger than those of ZnS bulk crystal [23

23. I. M. Catalano, A. Cingolani, and A. Minafra, “Multiphoton impurity luminescence in zinc sulphide,” Opt. Commun. 7, 270 (1973). [CrossRef]

]. This enhancement can be attributed to the quantum confinement effect since ZnS QDs’ average radius (R 0~1.3 nm) is smaller than the Bohr exciton radius (a B=2.2 nm). The good agreement demonstrates again that our model explains the data well for QD sizes in the range from being smaller than the exciton Bohr radius, a B to being greater than a B/3.

3. Conclusion

Acknowledgment

Xiaobo Feng gratefully acknowledges the scholarship from the China Scholarship Council. We also thank the financial support of the National University of Singapore (R-144-000-213-112).

References and links

1.

X. Michalet, F. F. Pinaud, L. A. Bentolila, J. M. Tsay, S. Doose, J. J. Li, G. Sundaresan, A. M. Wu, S. S. Gambhir, and S Weiss, “Quantum Dots for Live Cells, in Vivo Imaging, and Diagnostics,” Science 307, 538 (2005). [CrossRef] [PubMed]

2.

D. R. Larson, W. R. Zipfel, R. M. Williams, S. W. Clark, M. P. Bruchez, F. W. Wise, and W. W. Webb, “Water-Soluble Quantum Dots for Multiphoton Fluorescence Imaging in Vivo,” Science 300, 1434 (2003). [CrossRef] [PubMed]

3.

B. Dubertret, P. Skourides, D. J. Norris, V. Noireaux, A. H. Brivanlou, and A. Libchaber, “In Vivo Imaging of Quantum Dots Encapsulated in Phospholipid Micelles,” Science 298, 1759 (2002). [CrossRef] [PubMed]

4.

G. S. He, K. T. Yong, Q. D. Zheng, Y. Sahoo, A. Baev, A. I. Ryasnyanskiy, and P. N. Prasad, “Multi-photon excitation properties of CdSe quantum dots solutions and optical limiting behavior in infrared range,” Opt. Express 15, 12818 (2007). [CrossRef] [PubMed]

5.

F. E. Hernandez, K. D. Belfield, and I. Cohanoschi, “Three-photon absorption enhancement in a symmetrical charge transfer fluorene derivative,” Chem. Phys. Lett. 391, 22 (2004). [CrossRef]

6.

F. E. Hernandez, K. D. Belfield, I. Cohanoschi, M. Balu, and K. J. Schafer, “Three- and Four-Photon Absorption of a Multiphoton absorbing Fluorescent Probe,” Appl. Opt. 43, 5394 (2004). [CrossRef] [PubMed]

7.

A. V. Fedorov, A. V. Baranov, and K. Inoue, “Two-photon transitions in systems with semiconductor quantum dots,” Phys. Rev. B. 54, 8627 (1996). [CrossRef]

8.

J. W. M. Chon, M. Gu, C. Bullen, and P. Mulvaney, “Three-photon excited band edge and trap emission of CdS semiconductor nanocrystals,” Appl. Phys. Lett. 84, 4472 (2004). [CrossRef]

9.

J. He, W. Ji, J. Mi, Y. Zheng, and J. Y. Ying, “Three-photon absorption in water-soluble ZnS nanocrystals,” Appl. Phys. Lett. 88, 181114 (2006). [CrossRef]

10.

A. D. Lad, P. P. Kiran, G. R. Kumar, and S. Mahamuni, “Three-photon absorption in ZnSe and ZnSe/ZnS quantum dots,” Appl. Phys. Lett. 90, 133113 (2007). [CrossRef]

11.

I. M. Lifshits and V. V. Slezov, “The kinetics of diffusional decomposition of super-saturated solid solutions,” Zh. Eksp. Teor. Fiz 35, 479 (1958).

12.

P. Lawaetz, “Valence-band Parameters in Cubic Semiconductors,” Phys. Rev. B 4, 3460 (1971). [CrossRef]

13.

D. J. Norris and M. G. Bawendi, “Measurement and assignment of the size-dependent optical spectrum in CdSe quantum dots,” Phys. Rev. B 53, 16338 (1996). [CrossRef]

14.

L. A. Padilha, J. Fu, D. J. Hagan, E. W. Van Stryland, C. L. Cesar, L. C. Barbosa, C. H. B. Cruz, D. Buso, and A. Martucci, “Frequency degenerate and nondegenerate two-photon absorption spectra of semiconductor quantum dots,” Phys. Rev. B 75, 075325 (2007). [CrossRef]

15.

L. A. Padilha, J. Fu, D. J. Hagan, E. W. Van Stryland, C. L. Cesar, L. C. Barbosa, and C. H. B. Cruz, “Two-photon absorption in CdTe quantum dots,” Opt. Express 13, 6460 (2004). [CrossRef]

16.

Y. Nosaka, “Finite depth spherical well model for excited states of ultrasmall semiconductor particles: an application,” J. Phys. Chem. 95, 5054 (1991). [CrossRef]

17.

R. Viswanatha, S. Sapra, T. Saha-Dasgupta, and D. D. Sarma, “Electronic structure of and quantum size effect in III–V and II–VI semiconducting nanocrystals using a realistic tight binding approach,” Phys. Rev. B 72, 045333 (2005). [CrossRef]

18.

N. Kumbhojkar, V. V. Nikesh, A. Kshirsagar, and S. Mahamuni, “Photophysical properties of ZnS nanoclusters,” J. Appl. Phys. 88, 6260 (2000). [CrossRef]

19.

S. Sapra, A. Prakash, A. Ghangrekar, N. Periasamy, and D. D. Sarma, “Emission Properties of Manganese-Doped ZnS Nanocrystals,” J. Phys. Chem. B 109, 1663 (2005). [CrossRef]

20.

M. Sheik-Bahae, A. A. Said, T. H. Wei, D. J. Hagan, and E. W. Van Stryland, “Sensitive measurement of optical nonlinearities using a single beam,” IEEE J. Quantum Electron. 26, 760 (1990). [CrossRef]

21.

R. L. Sutherland, Handbook of Nonlinear Optics, with contributions by D. G. McLean and S. Kirkpatrick, Second Edition, (New York, NY: Marcel Dekker, 2003). [CrossRef]

22.

J. He, Y. L. Qu, H. P. Li, J. Mi, and W. Ji, “Three-photon absorption in ZnO and ZnS crystals,” Opt. Express 13, 9235 (2005). [CrossRef] [PubMed]

23.

I. M. Catalano, A. Cingolani, and A. Minafra, “Multiphoton impurity luminescence in zinc sulphide,” Opt. Commun. 7, 270 (1973). [CrossRef]

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(190.5970) Nonlinear optics : Semiconductor nonlinear optics including MQW
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

History
Original Manuscript: February 6, 2008
Revised Manuscript: March 17, 2008
Manuscript Accepted: March 17, 2008
Published: May 1, 2008

Citation
Xiaobo Feng, Yu Long Ang, Jun He, Cyrus W. J. Beh, Hairu Xu, Wee Shong Chin, and Wei Ji, "Three-photon absorption in semiconductor quantum dots: experiment," Opt. Express 16, 6999-7005 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-10-6999


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References

  1. X. Michalet, F. F. Pinaud, L. A. Bentolila, J. M. Tsay, S. Doose, J. J. Li, G. Sundaresan, A. M. Wu, S. S. Gambhir, and S. Weiss, "Quantum Dots for Live Cells, in Vivo Imaging, and Diagnostics," Science 307, 538 (2005). [CrossRef] [PubMed]
  2. D. R. Larson, W. R. Zipfel, R. M. Williams, S. W. Clark, M. P. Bruchez, F. W. Wise, and W. W. Webb, "Water-Soluble Quantum Dots for Multiphoton Fluorescence Imaging in Vivo," Science 300, 1434 (2003). [CrossRef] [PubMed]
  3. B. Dubertret, P. Skourides, D. J. Norris, V. Noireaux, A. H. Brivanlou, and A. Libchaber, "In Vivo Imaging of Quantum Dots Encapsulated in Phospholipid Micelles," Science 298, 1759 (2002). [CrossRef] [PubMed]
  4. G. S. He, K. T. Yong, Q. D. Zheng, Y. Sahoo, A. Baev, A. I. Ryasnyanskiy, and P. N. Prasad, "Multi-photon excitation properties of CdSe quantum dots solutions and optical limiting behavior in infrared range," Opt. Express 15, 12818 (2007). [CrossRef] [PubMed]
  5. F. E. Hernandez, K. D. Belfield, and I. Cohanoschi, "Three-photon absorption enhancement in a symmetrical charge transfer fluorene derivative," Chem. Phys. Lett. 391, 22 (2004). [CrossRef]
  6. F. E. Hernandez, K. D. Belfield, I. Cohanoschi, M. Balu and K. J. Schafer, "Three- and Four-Photon absorption of a multiphoton absorbing fluorescent probe," Appl. Opt. 43, 5394 (2004). [CrossRef] [PubMed]
  7. A. V. Fedorov, A. V. Baranov, and K. Inoue, "Two-photon transitions in systems with semiconductor quantum dots," Phys. Rev. B. 54, 8627 (1996). [CrossRef]
  8. J. W. M. Chon, M. Gu, C. Bullen, and P. Mulvaney, "Three-photon excited band edge and trap emission of CdS semiconductor nanocrystals," Appl. Phys. Lett. 84, 4472 (2004). [CrossRef]
  9. J. He, W. Ji, J. Mi, Y. Zheng, and J. Y. Ying, "Three-photon absorption in water-soluble ZnS nanocrystals," Appl. Phys. Lett. 88, 181114 (2006). [CrossRef]
  10. A. D. Lad, P. P. Kiran, G. R. Kumar, and S. Mahamuni, "Three-photon absorption in ZnSe and ZnSe/ZnS quantum dots," Appl. Phys. Lett. 90, 133113 (2007). [CrossRef]
  11. I. M. Lifshits and V. V. Slezov, "The kinetics of diffusional decomposition of super-saturated solid solutions," Zh. Eksp. Teor. Fiz 35, 479 (1958).
  12. P. Lawaetz, "Valence-band parameters in cubic semiconductors," Phys. Rev. B 4, 3460 (1971). [CrossRef]
  13. D. J. Norris and M. G. Bawendi, "Measurement and assignment of the size-dependent optical spectrum in CdSe quantum dots," Phys. Rev. B 53, 16338 (1996). [CrossRef]
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