[24p-D214-1~11] 3.16 Optics and Photonics English Session

▲ [24p-D214-8] Emission enhancement in MoS₂ flakes through coupling
with plasmonic resonance visualized by cathodoluminescence

〇(D)Dung Thi VU¹, Takumi Sannomiya¹ (1.Tokyo Tech)

Keywords:Luminescence enhancement, Surface plasmonic, molybdenum disulfide semiconductor

Transition metal dichalcogenides (TMDs) such as molybdenum disulfide (MoS₂) have unique optical properties such as the strong luminescence and the tunable bandgap. However, the small interaction distance is a limitation for their applications¹. In this study, we report a significant enhancement of A- and B-exciton emissions in MoS₂ flakes by coupling with plasmonic Au nano-pyramid arrays fabricated by the colloidal lithography technique. We experimentally map local emission enhancement from the structure with a nanometer spatial resolution by cathodoluminescence (CL) technique. A strongly enhanced emission intensity within the MoS₂-Au pyramids was achieved due to the localized surface plasmon resonance confined in nano-pyramids and its interaction with the periodicity-based resonance of array structure, promising for applications in optoelectronic and nano-photonic devices.