垂直耦合CdZnTe/ZnTe量子点的光学增益
Optical Gain of Vertically Coupled CdZnTe/ZnTe Quantum Dots.
作者信息
Mei Ming, Kim Minju, Kim Minwoo, Kim Inhong, Lee Hong Seok, Taylor Robert A, Kyhm Kwangseuk
机构信息
Department of Optics & Cogno-Mechatronics Engineering, Pusan National University, Busan 46241, Republic of Korea.
Smart Gym-Based Translational Research Center for Active Senior's Healthcare, Pukyong National University, Busan 48513, Republic of Korea.
出版信息
Nanomaterials (Basel). 2023 Feb 13;13(4):716. doi: 10.3390/nano13040716.
The optical modal gain of CdZnTe/ZnTe double quantum dots was measured using a variable stripe length method, where large and small quantum dots are separated with a ZnTe layer. With a large (18 nm) separation layer thickness of ZnTe, two gain spectra were observed, which correspond to the confined exciton levels of the large and small quantum dots, respectively. With a small (6 nm) separation layer thickness of ZnTe, a merged single gain spectrum was observed. This can be attributed to a coupled state between large and small quantum dots. Because the density of large quantum dots (4 × 10 cm) is twice the density of small quantum dots (2 × 10 cm), the density of the coupled quantum dots is determined by that of small quantum dots. As a result, we found that the peak gain (123.9 ± 9.2 cm) with the 6 nm separation layer is comparable to that (125.2 ± 29.2 cm) of the small quantum dots with the 18 nm separation layer.
采用可变条纹长度法测量了CdZnTe/ZnTe双量子点的光学模态增益，其中大、小量子点被一层ZnTe层隔开。当ZnTe的隔离层厚度较大（约18 nm）时，观察到两个增益谱，它们分别对应于大、小量子点的受限激子能级。当ZnTe的隔离层厚度较小（约6 nm）时，观察到一个合并的单一增益谱。这可归因于大、小量子点之间的耦合态。由于大量子点的密度（4×10¹⁰ cm⁻²）是小量子点密度（2×10¹⁰ cm⁻²）的两倍，耦合量子点的密度由小量子点的密度决定。结果，我们发现6 nm隔离层的峰值增益（123.9±9.2 cm⁻¹）与18 nm隔离层的小量子点的峰值增益（125.2±29.2 cm⁻¹）相当。
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