Ultrahigh field enhanced nanofocusing of radially polarized light by conical hybrid plasmonic probe with two low-index layers

Kang Li; Ji Xu; Sicheng Zhang; Xinyi Lu; Ning Liu; Yunqing Lu; Zhongcheng Liang

doi:10.1117/1.OE.58.7.077101

9 July 2019 Ultrahigh field enhanced nanofocusing of radially polarized light by conical hybrid plasmonic probe with two low-index layers

Kang Li, Ji Xu, Sicheng Zhang, Xinyi Lu, Ning Liu, Yunqing Lu, Zhongcheng Liang

Author Affiliations +

Optical Engineering, Vol. 58, Issue 7, 077101 (July 2019). https://doi.org/10.1117/1.OE.58.7.077101

Abstract

A conical hybrid plasmonic probe (CHPP) for ultrahigh field enhanced nanofocusing with lower loss is demonstrated. The CHPP consists of two different low-index dielectric layers sandwiched between a high-index conical core and a silver cladding. Properties of nanofocusing are analyzed by finite element method, under illumination of a radially polarized beam at a wavelength of 632.8 nm. The numerical results prove that, by introducing the additional lower-index layer, the whole low-index dielectric region is broadened to collect more energy efficiently, and the energy is converged on the apex of the CHPP to form the ultrahigh field enhancement. Compared with the traditional hybrid plasmonic probe, the optimized CHPP exhibits lower loss and higher field enhancement of 1771 times. The thickness and refractive index of the lower-index layer are discussed for optimizing the structure. The results indicate that the CHPP has a simple structure with excellent performance, which has important potential applications in relevant fields, particularly in nanotechnology of field enhancement. This work also provides a convenient way for designing and optimizing hybrid plasmonic structure.

Citation Download Citation

Kang Li, Ji Xu, Sicheng Zhang, Xinyi Lu, Ning Liu, Yunqing Lu, and Zhongcheng Liang "Ultrahigh field enhanced nanofocusing of radially polarized light by conical hybrid plasmonic probe with two low-index layers," Optical Engineering 58(7), 077101 (9 July 2019). https://doi.org/10.1117/1.OE.58.7.077101

Received: 17 May 2019; Accepted: 13 June 2019; Published: 9 July 2019

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