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Applied Physics Letters

|June 3, 2009

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We developed a new refractometric sensor using quantum dot microspheres. This sensor detects changes in refractive index with significantly improved sensitivity, outperforming theoretical predictions.

Area of Science:

Nanophotonics and optical sensing
Materials science with polymer microspheres
Quantum dot applications

Background:

Whispering-gallery modes (WGMs) in microspheres create narrow spectral peaks sensitive to refractive index changes.
Quantum dots (QDs) offer unique optical properties for enhanced sensing.
Current refractometric sensors have limitations in sensitivity and detection.

Purpose of the Study:

To develop a highly sensitive refractometric sensor using quantum dot-embedded polystyrene microspheres.
To investigate the coupling of two-photon excited luminescence from QDs into WGMs.
To optimize the sensor for improved spectral visibility and experimental sensitivity.

Main Methods:

Fabrication of quantum dot-embedded polystyrene microspheres.

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Excitation of two-photon luminescence from QDs.

Coupling of QD luminescence into microsphere WGMs.

Measurement of spectral shifts in response to changes in the surrounding refractive index.

Optimization of the detection area for enhanced WGM visibility.

Main Results:

Successful coupling of QD luminescence into WGMs.
Improved spectral visibility of WGMs through optimized detection.
Demonstration of spectral shifts correlating with refractive index changes.
Experimental sensitivity achieved was approximately five times higher than Mie theory predictions.

Conclusions:

Quantum dot-embedded microspheres are effective for refractometric sensing.
The developed sensor exhibits significantly enhanced sensitivity compared to theoretical models.
This approach holds promise for advanced optical sensing applications.