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

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Coherent random fiber laser emission from CdSe/ZnS quantum dots.

Lihua Ye¹, Zhixiang Cheng¹, Ziang Zhang¹

¹Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China.

|September 23, 2024

Summary

We achieved coherent random laser emission using cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots in hollow optical fibers. This low-threshold random laser, enhanced by silver nanoparticles, shows potential for photonic devices and display imaging.

Keywords:

quantum dots random lasers surface plasmons

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Area of Science:

Materials Science
Optics and Photonics
Nanotechnology

Background:

Random lasers offer unique emission properties but often suffer from high thresholds and poor coherence.
Colloidal quantum dots (QDs) provide tunable optical gain, making them promising for laser applications.
Hollow optical fibers offer a versatile platform for integrating gain media and controlling light propagation.

Purpose of the Study:

To demonstrate coherent random laser emission using CdSe/ZnS colloidal QDs within a hollow optical fiber.
To investigate the role of silver nanoparticles (Ag NPs) and QD density in achieving random lasing.
To explore the tunability of the random laser emission characteristics.

Main Methods:

Combining CdSe/ZnS colloidal QDs with hollow optical fibers.
Utilizing localized surface plasmon resonance (LSPR) induced by Ag NPs for enhanced lasing.
Employing high packing-density QD solutions to achieve lasing without Ag NPs.
Conducting angle-resolved emission measurements to study directional properties.

Main Results:

Observed well-distinguished discrete spikes indicative of coherent random laser emission from Ag-modified fibers.
Achieved low-threshold coherent random laser action in hollow optical fibers filled with high-density CdSe/ZnS QDs, even without Ag NPs.
Identified self-assembled QD clusters acting as both gain media and scattering centers.
Demonstrated adjustable directional emission by varying pumping methods.

Conclusions:

Coherent random laser emission is successfully demonstrated using CdSe/ZnS QDs in hollow optical fibers.
Both Ag NP-enhanced LSPR and high QD density contribute to low-threshold random lasing.
The developed random laser is facile, inexpensive, and tunable, with broad applications in photonic devices and display imaging.