14:45 〜 15:00
▼ [20p-C304-5] Low threshold plasmonic lattice laser based on CsPbBr3 quantum dots with directional emission
キーワード：perovskite, single-mode lasing, surface lattice resonance
Recently, plasmonics attracts lots of interest in the field of lasing as it enables strong light confinement in the near-field region at metal surfaces. When metallic nanoparticles (NPs) are arranged into a two-dimensional lattice, the localized surface plasmon resonance (LSPR) from a single particle will couple with the in-plane diffractive mode, resulting in a narrow-linewidth surface lattice resonance (SLR). SLRs have been utilized to make plasmonic lattice lasers with reported lasing thresholds ranging from 10-1 to 100 mJ/cm2. Since currently reported plasmonic lattice lasers are relying on dye-doped resists or solutions as gain media, replacement with more efficient gain materials is one of the keys to achieving lasers with lower thresholds. Solution-processed quantum dots (QDs), as one of the possible substitutes, have been studied as potential materials for gain media due to their compatibility with complex structures. Among the solution-processed QDs, lead halide perovskites CsPbX3 (X = Br, Cl, I) QDs gain great attention in photonic applications due to their outstanding optical properties. So far, lasers based on CsPbX3 QDs have been realized in the form of microdisk cavities, distributed feedback cavities, and plasmonic cavities. However, the realization of plasmonic lattice lasers using perovskite QDs is still a challenge.
In this work, we experimentally demonstrate an ultralow-threshold plasmonic lattice laser containing a CsPbBr3 QD thin film with low surface roughness and a large area achieved by a pressure-assisted recrystallization process. The spin-coated CsPbBr3 QD film on the Ag NPs array is pressed by a PDMS slab and then baked for recrystallization. The fabricated CsPbBr3 QD film achieved by the recrystallization process is characterized to have a low surface roughness with an RMS of 1.3 nm, and the resulting lasing threshold is 16.9 μJ/cm2.
In this work, we experimentally demonstrate an ultralow-threshold plasmonic lattice laser containing a CsPbBr3 QD thin film with low surface roughness and a large area achieved by a pressure-assisted recrystallization process. The spin-coated CsPbBr3 QD film on the Ag NPs array is pressed by a PDMS slab and then baked for recrystallization. The fabricated CsPbBr3 QD film achieved by the recrystallization process is characterized to have a low surface roughness with an RMS of 1.3 nm, and the resulting lasing threshold is 16.9 μJ/cm2.