Surface Normal Lasing from CdSe Nanoplatelets Coupled to Aluminum Plasmonic Nanoparticle Lattices
Surface Normal Lasing from CdSe Nanoplatelets Coupled to Aluminum Plasmonic Nanoparticle Lattices
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DOI：
10.1021/acs.jpcc.1c05662
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
Nicolas E Watkins;J. Guan;B. Diroll;Kali R. Williams;R. Schaller;Teri W. Odom
中科院分区：
文献类型：
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作者：
Nicolas E Watkins;J. Guan;B. Diroll;Kali R. Williams;R. Schaller;Teri W. Odom
本文描述了低阈值激光从胶体CdSe纳米片（NPLs）涂在二维等离子体腔组成的铝纳米粒子（NPs）。我们设计的NP晶格，以支持光谱窄的表面晶格共振，其波长重叠的放大自发辐射（ASE）从CdSe NPL。在Al NP晶格表面镀上CdSe非线性发光薄膜，在光泵作用下，在表面法线方向产生激光，具有低角度发散、窄谱线宽度（~ 1 nm）和~ 200 μJ/cm ~ 2的阈值。发现非线性光发射特性依赖于CdSe NPL膜的厚度。需要150 nm的最小厚度来观察SLR介导的激光，但较薄的膜仅表现出光致发光。150 nm以上的膜表现出在平面内波导ASE从CdSe非PL膜和激光作用从Al NP晶格。
This paper describes low-threshold lasing from colloidal CdSe nanoplatelets (NPLs) coated on two-dimensional plasmonic cavities composed of aluminum nanoparticles (NPs). We designed the NP lattice to support a spectrally narrow surface lattice resonance whose wavelength overlapped with the amplified spontaneous emission (ASE) from CdSe NPLs. Al NP lattices coated with CdSe NPL thin films were optically pumped and exhibited lasing in the surface normal direction with low angular divergence, narrow spectral line width (∼1 nm), and a threshold of ∼200 μJ/cm2. Nonlinear light emission characteristics were found to depend on the thickness of the CdSe NPL film. A minimum thickness of 150 nm was required to observe SLR-mediated lasing, but thinner films exhibited only photoluminescence. Films above 150 nm exhibited both in-plane waveguided ASE from the CdSe NPL film and lasing action from the Al NP lattice.