Applications of quantum dots in optical fiber luminescent oxygen sensors

Jorge, P. A. S.; Mayeh, Mona; Benrashid, R.; Caldas, Paulo; Santos, J. L.; Farahi, Faramarz

doi:10.1364/ao.45.003760

Cited by 35 publications

(31 citation statements)

References 22 publications

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“…In the next step the radius of QDs was varied from 1 nm to 30 nm. To carry out our simulations, we set the carrier density to = 3×10 22 m −3 and the damping rate as all the relaxation rates = 5 ps −1 [67][68][69]. Also, the refractive index of GaAs was set as constant value = 3.2.…”

Section: Resultsmentioning

confidence: 99%

Optical Rectification and Second Harmonic Generation on Quasi-Realistic InAs/GaAs Quantum Dots: With Attention to Wetting Layer Effect

Khaledi-Nasab

Sabaiean

Sahrai

et al. 2013

ISRN Condensed Matter Physics

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In this paper, we have performed a theoretical study on nonlinear optical rectification (OR) and second harmonic generation (SHG) for three-level dome-shaped InAs/GaAs quantum dots (QDs) in the presence of wetting layer (WL). We used the compact density matrix framework and effective mass approximation to investigate the second order nonlinear phenomena on InAs/GaAs QD. It is demonstrated that second harmonic generation (SHG), optical rectification (OR), and their mutual absorption and refractive index changes are quite sensitive to the size of QDs. The size variations have profound irregular behavior owing to distribution of envelope function on WL and QD simultaneously. Moreover it is found that = 13 nm is a critical radius where the regular variation takes place. It is shown that size variation causes blue shift until Critical radius ( = 13 nm) and after that, increasing the QD size lead to redshift in second order phenomena.

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Section: Resultsmentioning

confidence: 99%

Optical Rectification and Second Harmonic Generation on Quasi-Realistic InAs/GaAs Quantum Dots: With Attention to Wetting Layer Effect

Khaledi-Nasab

Sabaiean

Sahrai

et al. 2013

ISRN Condensed Matter Physics

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“…However, because a low permeability matrix was used, photodegradation of the Ru(dpp) was very small. It has already been demonstrated that, in spite of introducing a reduced sensitivity, doped non-hydrolitic sol-gel matrixes can provide for very photostable oxygen and temperature sensors [34,37].…”

Section: Resultsmentioning

confidence: 99%

Dual sensing of oxygen and temperature using quantum dots and a ruthenium complex

Jorge

Maule

Silva

et al. 2008

Analytica Chimica Acta

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A scheme for the simultaneous determination of oxygen and temperature using quantum dots and a ruthenium complex is demonstrated. The luminescent complex [Ru(II)-tris(4,7-diphenyl-1,10-phenanthroline)]2+ is immobilized in a non-hydrolytic sol-gel matrix and used as the oxygen sensor. The temperature information is provided by the luminescent emission of core-shell CdSe-ZnS semiconductor nanocrystals immobilized in the same material. Measurements of oxygen and temperature could be performed with associated errors of +/-2% of oxygen concentration and +/-1 degrees C, respectively. In addition, it is shown that while the dye luminescence intensity is quenched both by oxygen and temperature, the nanocrystals luminescent emission responds only to temperature. Results presented demonstrate that the combined luminescence response allows the simultaneous assessment of both parameters using a single optical fiber system. In particular, it was shown that a 10% error in the measured oxygen concentration, induced by a change in the sample temperature, could be compensated using the nanocrystals temperature information and a correction function.

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“…Other possibilities of QDs improving the performance of oxygen sensors were recently addressed [148]. By using a sol-gel prepared SiO 2 sample doped with CdSe/ZnS QDs, with low oxygen permeability, combined with an oxygen sensing film, it was possible to implement a ratiometric reference scheme.…”

Section: Optical Fiber Sensingmentioning

confidence: 99%

Optical Fiber Sensing Using Quantum Dots

Jorge

Martins

Trindade

et al. 2007

Sensors

Self Cite

114

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Recent advances in the application of semiconductor nanocrystals, or quantum dots, as biochemical sensors are reviewed. Quantum dots have unique optical properties that make them promising alternatives to traditional dyes in many luminescence based bioanalytical techniques. An overview of the more relevant progresses in the application of quantum dots as biochemical probes is addressed. Special focus will be given to configurations where the sensing dots are incorporated in solid membranes and immobilized in optical fibers or planar waveguide platforms.

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Applications of quantum dots in optical fiber luminescent oxygen sensors

Cited by 35 publications

References 22 publications

Optical Rectification and Second Harmonic Generation on Quasi-Realistic InAs/GaAs Quantum Dots: With Attention to Wetting Layer Effect

Optical Rectification and Second Harmonic Generation on Quasi-Realistic InAs/GaAs Quantum Dots: With Attention to Wetting Layer Effect

Dual sensing of oxygen and temperature using quantum dots and a ruthenium complex

Optical Fiber Sensing Using Quantum Dots

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