Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets

Gu, Guoqiang; Song, Jun; Liang, Hongda; Zhao, Mengjie; Chen, Yue; Qu, Junle

doi:10.1038/s41598-017-05781-4

Cited by 27 publications

(29 citation statements)

References 29 publications

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“…D is reduced from 2.2λ 0 to 0.7λ 0 . We notice that both L and D diminish with the reduction of FWHM, as in Ref [16][17][18][19][20][21]. This phenomenon can be compared to the result obtained with a conventional lens for which higher numerical aperture corresponds to a shorter focal length for a constant lens diameter.…”

Section: Ultra-narrow Photonic Nanojetsupporting

confidence: 73%

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Ultra-narrow photonic nanojets through a glass cuboid embedded in a dielectric cylinder

Yang¹,

Twardowski²,

Gérard³

et al. 2018

Opt. Express

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A glass cuboid, embedded inside a dielectric cylinder is studied when illuminated with a monochromatic plane wave. A photonic nanojet (PNJ) with a full-width at half-maximum (FWHM) waist of around 0.25λ is obtained outside the external surface of the cuboid. The influence of the parameters of a square section cuboid is studied. Three particular phenomena can be obtained and are discussed: an ultra-narrow PNJ on the external surface of the cuboid, a long photonic jet and the excitation of whispering gallery modes (WGMs). A parametric study, over the width and the height of a rectangular section cuboid, shows that these parameters can be used to control the photonic jet properties. We also study several other geometries of the insert, which shows that the key parameter is the refractive index of the inserted material. Finally, we show that by changing the incident angle we can obtain a curved photonic jet.

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Section: Ultra-narrow Photonic Nanojetsupporting

confidence: 73%

“…Yue et al reported a reduction of the FWHM (0.244λ 0 ) using cylindrical metalenses assembled by hexagonally arranged nanofibers [20]. Recently, ultra-narrow PNJs (0.287 λ 0 ) generated by overstepping the upper refractive index limit have been proposed by Gu et al [21]. A review of PNJs has been made by B. S. Luk'yanchuk [22].…”

Section: Introductionmentioning

confidence: 99%

Ultra-narrow photonic nanojets through a glass cuboid embedded in a dielectric cylinder

Yang¹,

Twardowski²,

Gérard³

et al. 2018

Opt. Express

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“…2(a) and 2(b), the bright areas in the upper half-cylinder are obviously larger than the bright areas in the case of single dielectric microcylinder. According to classical electromagnetic theory and our previous research, the energy flow diagram denoted by the field lines of time-averaged Poynting vectors can be used to compare and analyze the formation mechanism of PJs and PHs [26,27]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Photonic hooks from Janus microcylinders

Shao

Song

et al. 2019

Opt. Express

Self Cite

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Recently, a type of curved light beams, photonic hooks (PHs), was theoretically predicted and experimentally observed. The production of photonic hook (PH) is due to the breaking of structural symmetry of a plane-wave illuminated microparticle. Herein, we presented and implemented a new approach, of utilizing the symmetry-broken of the microparticles in material composition, for the generation of PHs from Janus microcylinders. Finite element method based numerical simulation and energy flow diagram represented theoretical analysis were used to investigate the field distribution characteristics and formation mechanism of the PHs. The full width at half-maximum (FWHM) of the PH (~0.29λ) is smaller than the FWHM of the photonic nanojet (~0.35λ) formed from a circular microcylinder with the same geometric radius. By changing the refractive index contrasts between upper and lower half-cylinders, or rotating the Janus microcylinder relative to the central axis, the shape profiles of the PHs can be efficiently modulated. The tunability of the PHs through simple stretching or compression operations, for the Janus microcylinder constituted by one solid inorganic halfcylinder and the other flexible polymer half-cylinder, was studied and discussed as well.

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“…In contrast, if the core’s refractive index is smaller than that of the shell ( Figure 2 c), the wavefront’s curvature decreases, generating an elongated nanojet with a lower peak intensity. Numerical simulations indicate that ultra-narrow (width from

[ 41 ] to

[ 42 , 43 ]) as well as ultra-long (length from ~22

[ 44 ] to 100

[ 45 , 46 ]) nanojets can be generated with core-shell dielectric spheres and cylinders.…”

Section: Practical Considerations For Nanopatterningmentioning

confidence: 99%

Nanopatterning with Photonic Nanojets: Review and Perspectives in Biomedical Research

Surdo

Diaspro

2021

Micromachines

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Nanostructured surfaces and devices offer astounding possibilities for biomedical research, including cellular and molecular biology, diagnostics, and therapeutics. However, the wide implementation of these systems is currently limited by the lack of cost-effective and easy-to-use nanopatterning tools. A promising solution is to use optical methods based on photonic nanojets, namely, needle-like beams featuring a nanometric width. In this review, we survey the physics, engineering strategies, and recent implementations of photonic nanojets for high-throughput generation of arbitrary nanopatterns, along with applications in optics, electronics, mechanics, and biosensing. An outlook of the potential impact of nanopatterning technologies based on photonic nanojets in several relevant biomedical areas is also provided.

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Overstepping the upper refractive index limit to form ultra-narrow photonic nanojets

Cited by 27 publications

References 29 publications

Ultra-narrow photonic nanojets through a glass cuboid embedded in a dielectric cylinder

Ultra-narrow photonic nanojets through a glass cuboid embedded in a dielectric cylinder

Photonic hooks from Janus microcylinders

Nanopatterning with Photonic Nanojets: Review and Perspectives in Biomedical Research

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