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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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All-Optically Controlled Terahertz Modulation by Silicon-Grown CdSe/CdZnS Colloidal Quantum Wells.

Reyihanguli Tudi¹, Zhongxin Zhang¹, Xintian Song¹

¹Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials, School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China.

Nanomaterials (Basel, Switzerland)

|October 28, 2025

Summary

Colloidal quantum wells made of CdSe/CdZnS offer a new way to create efficient terahertz modulators. These devices show high performance for terahertz communication and testing.

Keywords:

CdSe/CdZnS CQWs THz modulator all-optically controlled heterojunction

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Area of Science:

Materials Science
Optoelectronics
Quantum Engineering

Background:

Colloidal quantum wells (CQWs) exhibit unique optoelectronic properties.
Terahertz (THz) modulators are crucial for advanced communication systems.
Developing high-performance, cost-effective THz modulators remains a challenge.

Purpose of the Study:

To fabricate and characterize a novel terahertz modulator using CdSe/CdZnS colloidal quantum wells.
To evaluate the performance of the developed modulator in terms of modulation depth and bandwidth.
To assess the potential of this material for next-generation THz technologies.

Main Methods:

Fabrication of CdSe(4ML)/CdZnS nanosheets via spin-coating onto a silicon substrate.
Characterization of the all-optical terahertz modulator's performance.
Measurement of modulation depth and bandwidth across the terahertz spectrum.

Main Results:

Achieved a remarkable modulation depth of 87.6% at a low power density of 2 W/cm^2.
Demonstrated broadband modulation capabilities spanning from 0.25 THz to 1.4 THz.
Exhibited high carrier mobility and ultrafast response characteristics.

Conclusions:

CdSe/CdZnS colloidal quantum wells are highly promising for high-performance active terahertz modulators.
The developed all-optical device is cost-effective and suitable for terahertz communication and non-destructive testing.
The material's efficiency and performance pave the way for advancements in terahertz applications.