Dan'ko Viktor, Dmitruk Mykola, Indutnyi Ivan, Mamykin Sergiy, Myn'ko Victor, Shepeliavyi Petro, Lukaniuk Mariia, Lytvyn Petro
V. Lashkaryov Institute of Semiconductor Physics, Nat. Acad. of Sci. of Ukraine, 45, Prospect Nauky, 03028, Kyiv, Ukraine.
Nanoscale Res Lett. 2017 Dec;12(1):190. doi: 10.1186/s11671-017-1965-4. Epub 2017 Mar 11.
Optical properties of high-frequency Au gratings with a fixed period (296.6 ± 0.5 nm) and a variable modulation depth are studied using measurements of spectral and angular dependence of transmission and reflection of polarized light in order to build the dispersion curves of excited optical modes and to identify their types. It was shown that in gratings with small modulation depth only propagating surface plasmon-polaritons (SPP) modes were observed. With increasing of modulation depth, the intensity of SPP decreases and localized plasmon (LP) resonance appears, which is more intense at small incident angles, and overlaps with the SPP modes. For grating with isolated grooves (nanowires), mostly LP resonance is observed. After additional deposition of gold onto grating with isolated grooves, the intensity of the SPP mode increases again, and the LP band maximum shifts to longer wavelengths.
研究了具有固定周期（296.6±0.5nm）和可变调制深度的高频金光栅的光学特性，通过测量偏振光透射和反射的光谱及角度依赖性，以构建激发光学模式的色散曲线并确定其类型。结果表明，在调制深度较小的光栅中，仅观察到传播表面等离子体激元（SPP）模式。随着调制深度的增加，SPP的强度降低，局域等离子体（LP）共振出现，其在小入射角时更强，并与SPP模式重叠。对于具有孤立凹槽（纳米线）的光栅，主要观察到LP共振。在具有孤立凹槽的光栅上额外沉积金后，SPP模式的强度再次增加，并且LP带的最大值向更长波长移动。
