Honda Masahiro, Yamamoto Naoki
Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan.
Opt Express. 2013 May 20;21(10):11973-83. doi: 10.1364/OE.21.011973.
The characteristics of surface plasmon polaritons (SPPs) confined in a one-dimensional plasmonic crystal (1D-PlC) cavity are investigated using a cathodoluminescence (CL) detection system equipped with a 200 keV scanning transmission electron microscope (STEM). The dispersion curves of SPPs near the Γ point are derived from the angle-resolved CL spectra, and the SPP cavity modes are observed inside the band gap region. The mode number and wavenumber of the cavity modes are determined from the beam scan CL spectral images. The energy of the cavity mode depends on the cavity length and the angular distribution of the emission from the cavity changes with the mode number of the cavity mode. We also reveal that the phase shift due to the reflection at the cavity edge changes significantly with the resonant energy.
利用配备200 keV扫描透射电子显微镜（STEM）的阴极发光（CL）检测系统，研究了限制在一维等离子体晶体（1D - PlC）腔中的表面等离激元极化激元（SPP）的特性。从角分辨CL光谱中得出Γ点附近SPP的色散曲线，并在带隙区域内观察到SPP腔模。腔模的模式数和波数由束扫描CL光谱图像确定。腔模的能量取决于腔的长度，并且腔发射的角分布随腔模的模式数而变化。我们还发现，由于腔边缘反射引起的相移随共振能量而显著变化。
