College of Physics and Optoelectronic Engineering, Harbin Engineering University, 150001 Harbin, China.
Qingdao Innovation and Development Center of Harbin Engineering University, Harbin Engineering University, 266000 Qingdao, China.
ACS Appl Mater Interfaces. 2022 Dec 7;14(48):54304-54312. doi: 10.1021/acsami.2c13385. Epub 2022 Nov 23.
Lanthanide-doped upconversion nanoparticles (UCNPs) are appealing for light emitting applications because their high internal conversion efficiency facilitates the amplified spontaneous emission (ASE) under low pumping. In addition, the integration of photonic crystals and microcavities with optical quantum emitters provides a unique opportunity to manipulate their light emissions and generate coherent light sources for quantum photonics. Here, this work describes a two-dimensional (2D) plasmonic lattice of Al nanocone array (Al NCA), which can confine the light at the tip. Light confinement by the enhancement effect supports narrow linewidth resonances as optical feedback for the ASE of UCNPs doped with sensitizer Yb ions/emitter Ho ions/relaxator Ce ions. An off-angle ASE with an enhancement of 19-fold from UCNPs is achieved by propagating lattice plasmons from the Al NCA. Moreover, this upconverting ASE can be switched on or off by adjusting the polarization state of the incident pump light, and photonic band engineering can be used to manipulate it intentionally. This composite plasmonic system opens prospective applications for the ASE as directional emission, real-time tunable wavelengths, controlled multimode lasing, and optical switches.
镧系掺杂上转换纳米粒子（UCNPs）因其高内部转换效率而在发光应用中具有吸引力，因为在低泵浦下可以促进放大自发发射（ASE）。此外，光子晶体和微腔与光学量子发射器的集成提供了一个独特的机会来操纵它们的光发射，并为量子光子学产生相干光源。在这里，这项工作描述了二维（2D）的铝纳米锥阵列（Al NCA）等离子体晶格，它可以将光限制在尖端。光的限制通过增强效应支持窄线宽共振，作为敏化剂 Yb 离子/发射体 Ho 离子/弛豫剂 Ce 离子掺杂的 UCNPs 的 ASE 的光学反馈。通过传播来自 Al NCA 的晶格等离子体，可以实现 UCNPs 的 ASE 的 19 倍增强的离轴 ASE。此外，通过调整入射泵浦光的偏振状态，可以打开或关闭上转换 ASE，并且可以使用光子带工程来有意地操纵它。这种复合等离子体系统为 ASE 作为定向发射、实时可调谐波长、控制多模激光和光开关的应用提供了前景。
