Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 21, Pages 19631-19637Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b03880
Keywords
GaSe; plasmonic; SERS; photoluminescence; gratings; polarization control
Funding
- National Natural Science Foundations of China [61674124, 61774128, 61874092, 11604275, 61704040]
- Natural Science Foundation of Fujian Province [201810017, 2017J01012, 2018J01102]
- Outstanding Youth Foundation Project of Jiujiang [2018042]
- Fundamental Research Funds for the Central Universities [20720170012, 20720170018]
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Resonant plasmonic coupling has been considered as a promising strategy to enhance the optical response and manipulate the polarization of two-dimensional (2D) layer materials toward the practical applications. Here, a hybrid structure with periodic Ag nanoprism arrays was designed and fabricated on 2D GaSe layers to enhance these optical properties. By using the optimized hybrid structure with well-matched resonance, significant enhanced Raman scattering and band edge emission were successfully realized, and it is also interestingly found that the higher enhancement would be achieved while decreasing the thickness of GaSe layers. Theoretical simulation indicated that the strongly enhanced local field and the modified charge densities are the main reasons. By further introducing the patterned gratings on the plasmonic hybrid structure, selective excitation with controllable polarization was readily realized, besides the strongly enhanced photoluminescence intensity. This work provides a strategy for the plasmonic engineering of polarization controllable 2D optoelectronic devices.
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