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Colloidal quantum dot lasers built on a passive two-dimensional photonic crystal backbone.
Hojun Chang1, Kyungtaek Min1, Myungjae Lee1
1Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea. hsjeon@snu.ac.kr and Inter-university Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea.
Nanoscale
|March 4, 2016
Summary
Room-temperature lasing was achieved using two-dimensional photonic crystal structures with colloidal quantum dots. The quantum dot layer thickness controlled the dual band-edge modes, impacting future photonic integrated circuits.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Photonic crystals (PCs) offer unique light manipulation properties.
- Colloidal quantum dots (CQDs) provide efficient optical gain materials.
- Integrating active gain materials with passive photonic structures is crucial for advanced optical devices.
Purpose of the Study:
- To demonstrate room-temperature lasing from a novel two-dimensional photonic crystal structure.
- To investigate the role of colloidal quantum dot over-layer thickness on lasing modes.
- To explore the potential of this platform for photonic integrated circuits.
Main Methods:
- Fabrication of two-dimensional photonic crystal structures using a silicon nitride (Si3N4) backbone.
- Coating the Si3N4 structures with a layer of Cadmium Selenide/Cadmium Sulfide/Zinc Sulfide (CdSe/CdS/ZnS) colloidal quantum dots.
- Optical excitation of the devices to achieve lasing.
- Analysis of lasing modes and their dependence on the CQD over-layer thickness.
Main Results:
- Successful room-temperature lasing action was observed from the hybrid PC-CQD devices.
- Dual photonic crystal band-edge modes were identified as the lasing modes.
- The dominance of specific lasing modes was found to be tunable by adjusting the thickness of the CQD over-layer.
Conclusions:
- The developed laser platform demonstrates efficient room-temperature operation.
- The ability to control lasing modes via CQD layer thickness offers design flexibility.
- This technology is promising for the development of on-chip photonic integrated circuits due to inherent component coupling.
