A giant localized field enhancement and high sensitivity in an asymmetric ring by exhibiting Fano resonance

作者：He Jinna^*; Fan Chunzhen; Wang Junqiao; Ding Pei; Cai Genwang; Cheng Yongguang; Zhu Shuangmei; Liang Erjun

来源：Journal of Optics, 2013, 15(2): 025007.

DOI：10.1088/2040-8978/15/2/025007

• surface plasmons
• plasmon hybridization
• Fano resonance

The optical properties of asymmetric ring structures are investigated theoretically by using the discrete dipole approximation method. The numerical results revealed that this kind of structure can achieve a giant localized field enhancement (LFE, 264) and a high LSPR sensitivity (corresponding FOM, 8.28) in the visible spectrum by Fano resonance, whose origin is discussed based on plasmon hybridization theory. Furthermore, the dependence of the Fano resonance on the polarization states of the incident light is also demonstrated. Giant LFE and high LSPR sensitivity enable this structure to be promising for surface enhanced Raman spectroscopy and sensing applications.

• 出版日期2013-2
• 单位平顶山学院; 郑州大学; 郑州航空工业管理学院