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Updated: Dec 7, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Two-step light conversion with quantum dots inside non-linear crystals.

Dmytro Vorontsov¹, Galyna Okrepka², Yuriy Khalavka³

¹Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu, 3, 121 16 Prague 2, Czech Republic.

The Journal of Chemical Physics

|October 2, 2020

Summary

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This study demonstrates infrared to visible light up-conversion using a novel two-step process in composite materials. This method offers faster response times and broader spectral ranges compared to traditional up-converting materials.

Area of Science:

Materials Science
Optoelectronics
Photonics

Background:

Up-conversion of infrared (IR) light to visible light is crucial for various photonic applications.
Conventional up-conversion materials often rely on lanthanide ions, which can be costly and have limitations in response time and spectral range.

Purpose of the Study:

To demonstrate an unconventional two-step up-conversion process combining second harmonic generation (SHG) and photoluminescence (PL).
To develop novel composite materials for efficient IR to visible light up-conversion using abundant elements.

Main Methods:

Fabrication of composite materials by embedding Cadmium Telluride/Cadmium Sulfide (CdTe/CdS) quantum dots (QDs) within potassium dihydrogen phosphate (KDP) single crystals during growth.
Utilizing a two-step process: first, SHG of an IR laser in KDP, followed by absorption of the generated light by QDs to emit luminescence.

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Last Updated: Dec 7, 2025

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Published on: October 13, 2017

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Published on: June 28, 2016

Main Results:

Successful demonstration of IR to visible light up-conversion in the KDP:CdTe/CdS QD composite.
The composite exhibits a faster response time (nanoseconds) compared to lanthanide-based materials (milliseconds).
The up-conversion process shows strong dependence on the incident beam's direction and offers a broader spectral range for excitation and emission.

Conclusions:

The novel composite material provides an efficient and fast method for IR to visible light up-conversion.
This approach offers advantages over traditional lanthanide-based materials, including the use of abundant elements and tunable spectral properties.
The directional dependence and rapid response of this material open potential applications in advanced photonic devices.