Abstract

The spectral features, i.e., wavelength and intensity, of fluorescence generated from semiconductor nanocrystals (quantum dots) can be used for coding information. Unlike the 1-D and 2-D barcodes, the information carrier is applied to a very small area and hardly visible. The information retrieving by a fluorospectrometer is not subjected to the changes of rotation and scale. A de-convolution-based algorithm is used to separate the overlapped spectral profiles. This technology can be applied to small products labeling, document security and object identification.

© 2004 Optical Society of America

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References

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    [CrossRef]
  2. M. Han, X. Gao, J. Z. Su, S. Nie, �??Quantum-dot-tagged microbeads for multiplexed optical coding of biomolecules,�?? Nature Biotechnol. 19, 631-635 (2001).
    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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  7. <a href="http://www.evidenttech.com">http://www.evidenttech.com</a>
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    [CrossRef]
  9. <a href="http://www.oceanoptics.com">http://www.oceanoptics.com</a>
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    [CrossRef]
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    [CrossRef]

Adv. Mater. (1)

J. Lee, V. C. Sundar, J. R. Heine, M. G. Bawendi, K. F. Jensen, �??Full color emission from II-VI semiconductor quantum dot-polymer composites,�?? Adv. Mater. 12, 1102-1105 (2000).
[CrossRef]

Current Opinion in Biotechnol. (1)

W. C. W. Chan, D. J. Maxwell, X. Gao, R. E. Bailey, M. Han, S. Nie, �??Luminescent quantum dots for multiplexed biological detection and imaging,�?? Current Opinion in Biotechnol. 13, 40-46 (2002).
[CrossRef]

J. Biomed. Opt. (1)

X. Gao, W. C. W. Chan, S. Nie, �??Quantum-dot nanocrystals for ultrasensitive biological labeling and multicolor optical encoding,�?? J. Biomed. Opt. 74, 532-537 (2002).
[CrossRef]

J. Phys. Chem. (2)

M. A. Hines, P. Guyot-Sionnest, �??Synthesis and characterization of strongly luminescing ZnS-capped CdSe nanocrystals,�?? J. Phys. Chem. 100, 468-471 (1996).
[CrossRef]

A. P. Alivisatos, �??Perspectives on the physical chemistry of semiconductor nanocrystals,�?? J. Phys. Chem. 100, 13226-13239 (1996).
[CrossRef]

J. Phys. Chem. B (1)

B. O. Dabbousi, J. Rodriguez-Viejo, F. V. Mikulec, J. R. Heine, H. Mattoussi, R. Ober, K. F. Jensen, M. G. Bawendi, �??(CdSe)ZnS core-shell quantum dots: synthesis and characterization of a size series of highly luminescent nanocrystallites,�?? J. Phys. Chem. B, 101, 9463-9475 (1997).
[CrossRef]

Nature Biotechnol. (1)

M. Han, X. Gao, J. Z. Su, S. Nie, �??Quantum-dot-tagged microbeads for multiplexed optical coding of biomolecules,�?? Nature Biotechnol. 19, 631-635 (2001).
[CrossRef]

Opt. & Laser Technol. (1)

C. C. Chan, W. Jin, M. S. Demokan, �??Enhancement of measurement accuracy in fiber Bragg grating sensors by using digital signal processing,�?? Opt. & Laser Technol. 31, 299-307 (1999).
[CrossRef]

Opt. Eng. (1)

S. Chang and C. P. Grover, �??Centroid detection based on optical correlation," Opt. Eng. 41, 2479-2486 (2002).
[CrossRef]

Other (2)

<a href="http://www.oceanoptics.com">http://www.oceanoptics.com</a>

<a href="http://www.evidenttech.com">http://www.evidenttech.com</a>

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Figures (4)

Fig. 1.
Fig. 1.

Information contained in info-ink

Fig. 2.
Fig. 2.

The information retrieving system

Fig. 3.
Fig. 3.

Fluorescent spectrum of an info-ink

Fig. 4.
Fig. 4.

Illustration of spectral lines extraction

Equations (6)

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f ) = i = 1 N k i · δ ( λ λ i ) P ( λ i ) ,
FT [f ( λ ) ] = i = 1 N k i · FT [ δ ( λ λ i ) ] · FT [p ( λ i ) ] ,
F (u ) = i = 1 N k i · D i · P i .
F ( u ) / P m = i = 1 m 1 k i · D i · P i / P m + k m · D m + i = m + 1 N k i · D i · P i / P m .
IFT [ F ( u ) / P m ] = IFT [ i = 1 m 1 k i D i P i / P m + i = m + 1 N k i D i P i / P m ] + k m · δ ( λ λ m )
IFT [ F ( u ) / P m ] = i = 1 N k i δ ( λ λ i )

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