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Spatial range of the plasmonic Dicke effect in an InGaN/GaN multiple quantum well structure
Wai Fong Tse1, Ruei-Nan Wu1, Cai-Chen Lu1
1Institute of Photonics and Optoelectronics, and Department of Electrical Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.
Nanotechnology
|April 9, 2020
Summary
The plasmonic Dicke effect enhances light emission in quantum wells (QWs) by coupling them to surface plasmons (SPs). Emission efficiency increases with QW number up to a critical point, optimizing SP coupling.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Optoelectronics
Background:
- The plasmonic Dicke effect describes enhanced light emission from multiple emitters coupled to a shared surface plasmon (SP) mode in metal nanostructures.
- This cooperative emission mechanism offers a pathway to higher collective emission efficiency.
- Indium Gallium Nitride/Gallium Nitride (InGaN/GaN) quantum wells (QWs) are crucial for optoelectronic devices, and their emission efficiency is a key performance metric.
Purpose of the Study:
- To investigate and compare the emission efficiency enhancements in InGaN/GaN quantum-well (QW) structures with varying QW period numbers under surface plasmon (SP) coupling.
- To demonstrate emission behavior consistent with the plasmonic Dicke effect in a multi-QW system.
- To identify the optimal QW structure for maximizing the SP coupling effect and understand the effective depth range of the plasmonic Dicke effect.
Main Methods:
- Fabrication of InGaN/GaN quantum-well (QW) structures with different QW period numbers.
- Coupling of QW structures with surface Ag nanoparticles to induce surface plasmon (SP) excitation.
- Measurement of internal quantum efficiency and time-resolved photoluminescence to compare emission efficiencies of blue and green QW structures.
Main Results:
- The relative enhancement of overall emission efficiency increased with the QW period number up to a critical value.
- Beyond this critical QW period number, the emission enhancement began to decrease, indicating an optimal range for SP coupling.
- The observed behavior was consistent with the principles of the plasmonic Dicke effect, showing enhanced collective emission.
Conclusions:
- The study confirms the plasmonic Dicke effect in SP-coupled InGaN/GaN QW systems, demonstrating enhanced light emission.
- A critical QW period number was identified, representing the effective depth for plasmonic Dicke effect and an optimized structure for maximizing SP coupling.
- Surface plasmon coupling with Ag nanoparticles provides an effective method to enhance the emission efficiency of InGaN/GaN QW structures.
