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Updated: Apr 6, 2026
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
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Terahertz emission in ladder plus Y-configurations in double quantum dot structure
Applied Optics
|July 21, 2015
Summary
This study enhances second-order nonlinear susceptibility (SONS) in quantum dot (QD) structures using a wetting layer (WL). Optimized QD structures show potential for terahertz (THz) applications.
Area of Science:
- Condensed Matter Physics
- Quantum Optics
- Nanotechnology
Background:
- Nonlinear optical properties of quantum dot (QD) structures are crucial for advanced photonic devices.
- Improving second-order nonlinear susceptibility (SONS) is key for efficient light-matter interactions.
Purpose of the Study:
- To investigate methods for enhancing SONS in a ladder-type Y-double quantum dot (QD) structure.
- To analyze the contributions of the wetting layer (WL) and QD inhomogeneity to SONS.
Main Methods:
- Theoretical examination of a ladder-type Y-double quantum dot (QD) structure.
- Analysis of structure size, energy level separation, momentum matrix elements, and pump detuning.
- Inclusion of wetting layer (WL) and quantum dot (QD) inhomogeneity effects.
Main Results:
- The wetting layer (WL) significantly increases SONS.
- A low momentum matrix element for WL-QD transitions enhances SONS compared to interdot transitions.
- Quantum dot (QD) inhomogeneity was found to reduce SONS by approximately 50%.
Conclusions:
- The proposed QD structure with WL shows enhanced SONS, making it suitable for terahertz (THz) applications.
- Optimized QD structures can achieve frequency emissions in the 75.5–600 μm range.
- This research provides a pathway for developing novel THz devices.
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