Hybrid plasmonic ring resonator at subwavelength scale in the visible spectrum

作者：Shi, Feifei; Gong, Xin; Zhang, Zhaoyu^*

来源：Journal of Nanophotonics, 2014, 8(1): 083990.

DOI：10.1117/1.JNP.8.083990

• ring resonator
• hybrid plasmonic
• subwavelength
• visible spectrum

In the past decade, plasmonic resonators have emerged and exploited field compression to create ultrasmall mode volume devices and to enhance light-matter interactions. We devised a ring resonator on a metal substrate separated by a low-permittivity dielectric, which supports hybrid plasmonic modes with a highly localized electromagnetic field. The finite difference time domain method was used to calculate the properties of the ring resonator. By changing the cavity's geometry and low-permittivity dielectric's height, a high-quality factor along with ultracompact mode confinement was achieved, leading to Purcell factor as high as 2.7 x 10(4). The hybrid plasmonic ring resonator exhibits a trade-off between the high-quality factor and the ultrasmall mode volume at subwavelength scale in the visible spectrum. c 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)

• 出版日期2014-4-9
• 单位北京大学深圳研究生院; 北京大学