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

doi:10.1088/1674-1056/26/1/017807

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.

Keywords: sexfoil nanoparticle localized surface plasmon resonance extinction properties LSPR sensors

Received: 12 August 2016
Revised: 23 September 2016
Accepted manuscript online:

PACS:	78.68.+m	(Optical properties of surfaces)
	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)

Fund: 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.

Corresponding Authors: Ling Li
E-mail: lingli70@aliyun.com

Cite this article:

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) Effects of thickness & shape on localized surface plasmon resonance of sexfoil nanoparticles 2017 Chin. Phys. B 26 017807

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

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