Observation of split evanescent field distributions in tapered multicore fibers for multiline nanoparticle trapping and microsensing

Yan，Dong1; Tian，Zhen1,2; Chen，Nan Kuang1; Zhang，Liqiang1; Yao，Yicun1; Xie，Yanru1; Shum，Perry Ping3; Grattan，Kenneth T.V.4; Wang，Daqin1

2021-03-15

10.1364/OE.419194

OPTICS EXPRESS   影响因子和分区

1094-4087

1094-4087

The optical attractive force in tapered single-mode fibers (SMFs) is usually uniformly distributed around the tapered section and has been found to be important for trapping and manipulating targeted atoms and nanoparticles. In contrast, a peculiar phenomenon of the evanescent field splitting along the azimuth axis can be experimentally observed by tapering a weakly-coupled MCF into a strongly-coupled MCF to generate supermode interference. Moreover, the supermode interference produces a hexagonally distributed evanescent field and its six vertices give rise to the multiline optical attractive force. For such spectral resonances, the optimum extinction ratio for the transmission dips is given by 47.4 dB, this being determined using an index liquid to cover the tapered MCF. The resonant dips move to a greater extent at longer wavelengths, with the optimum tuning efficiency of 392 nm/RIU for index sensing. The split evanescent fields respectively attract the excited upconversion nanoparticles in the liquid to be linearly aligned and running down the tapered region over the fiber surface, emitting green light with 60° symmetry. The charged nanoparticles were periodically self-organized, with a period of around 1.53 µm. The parallel lines, with 60° rotational symmetry, can be useful for (1) indicating the exact locations of the side-cores or orientations of the tapered MCF; (2) as precision alignment keys for micro-optical manipulation; and (3) enhancing the upconversion light, or for use in lasers, coupling back to the MCF. The split evanescent fields can be promising for developing new evanescent field-based active and passive fiber components with nano-structures.

SCI ; EI

英语

其他

Liaocheng University[318051411,31805180101,319190301] ; Natural Science Foundation of Shandong Province["ZR201910210137","ZR201910280068"] ; National Natural Science Foundation of China[61875247]

Optics

Optics

WOS:000629298900127

OPTICAL SOC AMER

20211110085047

Fibers ; Nanoparticles ; Single mode fibers

Electricity and Magnetism:701 ; Fiber Optics:741.1.2 ; Nanotechnology:761 ; Solid State Physics:933

PHYSICS

2-s2.0-85102469580

Scopus

1.School of Physics Sciences and Information Technology,Liaocheng University,Liaocheng,252000,China
2.State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing,100876,China
3.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Electrical and Electronic Engineering,City,University of London,London,EC1 V 0HB,United Kingdom

Yan，Dong,Tian，Zhen,Chen，Nan Kuang,et al. Observation of split evanescent field distributions in tapered multicore fibers for multiline nanoparticle trapping and microsensing[J]. OPTICS EXPRESS,2021,29(6):9532-9543.

Yan，Dong.,Tian，Zhen.,Chen，Nan Kuang.,Zhang，Liqiang.,Yao，Yicun.,...&Wang，Daqin.(2021).Observation of split evanescent field distributions in tapered multicore fibers for multiline nanoparticle trapping and microsensing.OPTICS EXPRESS,29(6),9532-9543.

Yan，Dong,et al."Observation of split evanescent field distributions in tapered multicore fibers for multiline nanoparticle trapping and microsensing".OPTICS EXPRESS 29.6(2021):9532-9543.