Liu Yang, Yu Huaqing, Zeng Qingdong, Wang Boyun, Peng Qian
Opt Lett. 2024 Oct 1;49(19):5591-5594. doi: 10.1364/OL.538013.
To develop alternative plasmonic materials for nanophotonic applications, the thickness-dependent optical properties of ultrathin plasmonic SrNbO (SNO) films deposited on MgO are investigated. As the thickness decreases from 10 to 2 nm, the film exhibits less metallic, epsilon-near-zero (ENZ) wavelength redshift and higher optical loss due to increased scattering. Nevertheless, the thinnest film still has a high carrier concentration of 10cm, and the real part of the dielectric functions of all films is less than zero in the near-infrared (NIR) wavelength region, indicating that the samples possess relatively high metallicity and plasmonic characteristics in the NIR. It is found that the carrier concentration dominates the electron effective mass and Drude plasma frequency. Although Au is a commonly used plasmonic material, at a wavelength of 1550 nm, the loss of SNO is 85.8% lower than that of Au, and its plasmonic performance metrics is significantly higher than TiN, Al:ZnO and Sn:InO, demonstrating the great potential of SNO in NIR plasmonic device applications.
为了开发用于纳米光子应用的替代等离子体材料，研究了沉积在MgO上的超薄等离子体SrNbO（SNO）薄膜的厚度依赖性光学性质。随着厚度从10 nm减小到2 nm，由于散射增加，薄膜呈现出较少的金属性、近零介电常数（ENZ）波长红移和更高的光学损耗。然而，最薄的薄膜仍具有10²¹ cm⁻³ 的高载流子浓度，并且所有薄膜的介电函数实部在近红外（NIR）波长区域均小于零，这表明样品在NIR中具有相对较高的金属性和等离子体特性。研究发现，载流子浓度主导着电子有效质量和德鲁德等离子体频率。尽管金是常用的等离子体材料，但在1550 nm波长下，SNO的损耗比金低85.8%，其等离子体性能指标明显高于TiN、Al:ZnO和Sn:InO，这表明SNO在近红外等离子体器件应用中具有巨大潜力。
