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Fig. 1 | Nanoscale Research Letters

Fig. 1

From: InAs/GaAs Quantum Dot Dual-Mode Distributed Feedback Laser Towards Large Tuning Range Continuous-Wave Terahertz Application

Fig. 1

Schematic diagram and morphology of InAs/GaAs QDs LC-DFB laser structure. a Schematic diagram of InAs/GaAs QD LC-DFB laser structure. Inset: cross-sectional TEM image of the QD active layer structure. b The top view of the SEM image of LC-DFB laser structure with first-order grating. Inset: enlarged SEM image focus on the joint between the grating and ridge waveguide

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