中国物理B ›› 2017, Vol. 26 ›› Issue (1): 17807-017807.doi: 10.1088/1674-1056/26/1/017807

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Effects of thickness & shape on localized surface plasmon resonance of sexfoil nanoparticles

Yan Chen(陈艳), Xianchao Liu(刘贤超), Weidong Chen(陈卫东), Zhengwei Xie(谢征微), Yuerong Huang(黄跃容), Ling Li(李玲)   

  1. 1. College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, China;
    2. State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology, Chengdu 610054, China
  • 收稿日期:2016-08-12 修回日期:2016-09-23 出版日期:2017-01-05 发布日期:2017-01-05
  • 通讯作者: Ling Li E-mail:lingli70@aliyun.com
  • 基金资助:
    Project supported by the Sichuan Provincial Department of Education, China (Grant No. 16ZA0047), the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China (Grant No. 201509), the Large Precision Instruments Open Project Foundation of Sichuan Normal University, China (Grant Nos. DJ201557, DJ201558 and DJ201560), and the State Key Laboratory of Optical Technologies on Nano Fabrication and Micro Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences.

Effects of thickness & shape on localized surface plasmon resonance of sexfoil nanoparticles

Yan Chen(陈艳)1, Xianchao Liu(刘贤超)1,2, Weidong Chen(陈卫东)1, Zhengwei Xie(谢征微)1, Yuerong Huang(黄跃容)1, Ling Li(李玲)1   

  1. 1. College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, China;
    2. State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology, Chengdu 610054, China
  • Received:2016-08-12 Revised:2016-09-23 Online:2017-01-05 Published:2017-01-05
  • Contact: Ling Li E-mail:lingli70@aliyun.com
  • Supported by:
    Project supported by the Sichuan Provincial Department of Education, China (Grant No. 16ZA0047), the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China (Grant No. 201509), the Large Precision Instruments Open Project Foundation of Sichuan Normal University, China (Grant Nos. DJ201557, DJ201558 and DJ201560), and the State Key Laboratory of Optical Technologies on Nano Fabrication and Micro Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences.

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摘要： Localized surface plasmon (LSPR) resonance and sensing properties of a novel nanostructure (sexfoil nanoparticle) are studied using the finite-difference time-domain method. For the sandwich sexfoil nanoparticle, the calculated extinction spectrum shows that with the thickness of the dielectric layer increasing, long-wavelength peaks blueshift, while short-wavelength peaks redshift. Strong near-field coupling of the upper and lower metal layers leads to electric and magnetic field resonances; as the thickness increases, the electric field resonance gradually increases, while the magnetic field resonance decreases. The obtained refractive index sensitivity and figure of merit are 332 nm/RIU and 3.91 RIU-1, respectively. In order to obtain better sensing ability, we further research the LSPR character of monolayer Ag sexfoil nanoparticle. After a series of trials to optimize the thickness and shape, the refractive index sensitivity approximates 668 nm/RIU, and the greatest figure of merit value comes to 14.8 RIU-1.

关键词: sexfoil nanoparticle, localized surface plasmon resonance, extinction properties, LSPR sensors

Abstract: Localized surface plasmon (LSPR) resonance and sensing properties of a novel nanostructure (sexfoil nanoparticle) are studied using the finite-difference time-domain method. For the sandwich sexfoil nanoparticle, the calculated extinction spectrum shows that with the thickness of the dielectric layer increasing, long-wavelength peaks blueshift, while short-wavelength peaks redshift. Strong near-field coupling of the upper and lower metal layers leads to electric and magnetic field resonances; as the thickness increases, the electric field resonance gradually increases, while the magnetic field resonance decreases. The obtained refractive index sensitivity and figure of merit are 332 nm/RIU and 3.91 RIU-1, respectively. In order to obtain better sensing ability, we further research the LSPR character of monolayer Ag sexfoil nanoparticle. After a series of trials to optimize the thickness and shape, the refractive index sensitivity approximates 668 nm/RIU, and the greatest figure of merit value comes to 14.8 RIU-1.

Key words: sexfoil nanoparticle, localized surface plasmon resonance, extinction properties, LSPR sensors

中图分类号:  (Optical properties of surfaces)

  • 78.68.+m
42.62.Be (Biological and medical applications) 73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)) 78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)