Tunable surface plasmon mediated emission from semiconductors by using metal alloys
Tunable surface plasmon mediated emission from semiconductors by using metal alloys
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DOI：
10.1063/1.2752770
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发表时间：
2007-07
影响因子：
4
通讯作者：
D. Lei;Jia Li;H. Ong
中科院分区：
文献类型：
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作者：
D. Lei;Jia Li;H. Ong
作者探讨了利用二元金属合金在半导体表面等离子体介导发射上的可能性。通过调整合金成分，他们发现表面等离子体共振能量可以调谐到与半导体的发射能量相匹配，从而优化半导体与表面等离子体之间的能量传递过程。他们计算了不同合金成分下ZnO和ZnTe的态等离子体密度和Purcell因子，结果支持了这一论点。实验中，他们制备了不同组成的AlxAg1−x∕ZnO薄膜，并测量了其光致发光性能。Al0.8Ag0.2∕ZnO的带边发射强度是裸ZnO的约60倍，与理论预测一致。因此，金属合金可以被认为是优化表面等离子体介导发射的一种简单有效的手段。
The authors have explored the possibility of using binary metal alloys on surface plasmon mediated emission from semiconductor. By adjusting the alloy composition, they have found that the surface plasmon resonance energy can be tuned to match with the emission energy of semiconductor so that the energy transfer process between the semiconductor and surface plasmons can be optimized. They have calculated the plasmonic density of states and Purcell factor for ZnO and ZnTe at different alloy compositions and the results support the argument. Experimentally, they have prepared AlxAg1−x∕ZnO films at different compositions and have measured their photoluminescence. The band-edge emission from Al0.8Ag0.2∕ZnO is found to be ∼60 times stronger than that of bare ZnO, which is consistent with the theoretical prediction. As a result, metal alloys can be considered as a simple and effective means in optimizing the surface plasmon mediated emission.