Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
Nano Lett. 2011 Dec 14;11(12):5524-30. doi: 10.1021/nl203418c. Epub 2011 Nov 30.
We study the resonant modes of surface plasmon whispering gallery cavities based on a circular groove in a Au surface. We use spatially, angle-, and polarization-resolved cathodoluminescence spectroscopy to measure the resonant plasmonic local field distribution at deep-subwavelength resolution and determine the far-field radiation distribution for each plasmonic mode. We show mode-selective excitation of the plasmonic modes and resolve the modal angular radiation pattern. The results show that plasmonic whispering gallery resonators can be used as versatile antennas both in receiving and transmitting mode.
我们研究了基于金表面圆形凹槽的表面等离激元 whisperinggallery 腔的共振模式。我们使用空间、角度和偏振分辨的阴极荧光光谱技术，以深亚波长分辨率测量共振等离子体局域场分布，并确定每个等离子体模式的远场辐射分布。我们展示了等离子体模式的选择性激发，并解析了模态角辐射模式。结果表明，等离子体 whisperinggallery 谐振器可用作接收和发射模式下的多功能天线。
