Photonic jet generated by spheroidal particle with Gaussian-beam illumination

Han, Liping; Han, Yiping; Gouesbet, G.; Wang, Jiajie; Gréhan, Gèrard

doi:10.1364/josab.31.001476

Cited by 52 publications

(11 citation statements)

References 55 publications

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“…In the case of trapping soft spheres, such as water drops, as has been recently reported [52], laser-induced surface stress would break the spherical symmetry of the scatterer leading to spheroidal particles. The PNJs generated by such scatterers have recently been reported in [53]. Finally when whispering-gallery modes or pulsed beams are of interest, they can also be detected in an optical trap [49], thereby validating recent simulations on photonic-jet shaping [54] and temporal dynamics of the jet [55].…”

Section: Resultssupporting

confidence: 61%

Photonic nanojets in optical tweezers

Neves

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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Photonic nanojets have been brought into attention ten years ago for potential application in ultramicroscopy, because of its sub-wavelength resolution that can enhance detection and interaction with matter. For these novel applications under development, the optical trapping of a sphere acts as an ideal framework to employ photonic nanojets. In the present study, we generated nanojets by using a highly focused incident beam, in contrast to traditional plane waves. The method inherits the advantage of optical trapping, especially for intracellular applications, with the microsphere in equilibrium on the beam propagation axis and positioned arbitrarily in space. Moreover, owing to optical scattering forces, when the sphere is in equilibrium, its center shifts with respect to the focal point of the incident beam. However, when the system is in stable equilibrium with a configuration involving optical tweezers, photonic nanojets cannot be formed. To overcome this issue, we employed double optical tweezers in an unorthodox configuration involving two collinear and co-propagating beams, the precise positioning of which would turn on/off the photonic nanojets, thereby improving the applicability of photonic nanojets.

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Section: Resultssupporting

confidence: 61%

Photonic nanojets in optical tweezers

Neves

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…The photonic nanojets are found to have the long-tail, non-resonant, and strong light intensity with long effective length, emanating from the shadow side of the illuminated objects. They can be generated by different shapes and microstructures of the objects, such as dielectric circular cylinders [6,7], microspheres [8,9], micro ellipsoids [10,11], micro cube [12], micro triangular body, micro hexahedron, micro triangular cone [13,14], micro disk [15], hemisphere [16], micro-toroid [17], and core-shell microspheres [18,19,20,21]. In order to create photonic nanojets with strong light intensity, the structural parameters and materials used in the illuminated and transparent objects need to be carefully chosen and suitably designed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Tunable Photonic Nanojets Generated by Biocompatible Hydrogel Core-Shell Microspheres for Surface-Enhanced Raman Scattering Applications

Wang

Dai

2019

Polymers

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Core-shell microspheres have been applied in various research areas and, in particular, they are used in the generation of photonic nanojets with suitable design for photonic applications. The photonic nanojet is a narrow and focused high-intensity light beam emitting from the shadow-side of microspheres with tunable effective length, thus enabling its applications in biosensing technology. In this paper, we numerically studied the photonic nanojets brought about from biocompatible hydrogel core-shell microspheres with different optical properties. It was found that the presence of the shell layer can significantly affect the characteristics of the photonic nanojets, such as the focal distance, intensity, effective length, and focal size. Generally speaking, the larger the core-shell microspheres, the longer the focal distance, the stronger the intensity, the longer the effective length, and the larger the focal size of the generated photonic nanojets are. The numerical simulations of the photonic nanojets from the biocompatible core-shell microspheres on a Klarite substrate, which is a classical surface-enhancing Raman scattering substrate, showed that the Raman signals in the case of adding the core-shell microspheres in the system can be further enhanced 23 times in water and 108 times in air as compared in the case in which no core-shell microspheres are present. Our study of using tunable photonic nanojets produced from the biocompatible hydrogel core-shell microspheres shows potential in future biosensing applications.

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“…Such a method was applied to laser-fabricate subwavelength holes and convex bumps [21,22], even on materials with low absorption at a given wavelength (λ) [23,24]. Various attempts to tailor the PN optical properties were reported, including changing the refractive index (n) and the shape and diameter (2r) of microspheres and also the illumination conditions [15,[25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Subwavelength Direct Laser Nanopatterning Via Microparticle Arrays for Functionalizing Metallic Surfaces

Romano

Ahmed

García‐Girón

et al. 2019

Journal of Micro and Nano-Manufacturing

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Functionalized metallic nanofeatures can be selectively fabricated via ultrashort laser processing; however, the cost-effective large-area texturing, intrinsically constrained by the diffraction limit of light, remains a challenging issue. A high-intensity near-field phenomenon that takes place when irradiating microsized spheres, referred to as photonic nanojet (PN), was investigated in the transitional state between geometrical optics and dipole regime to fabricate functionalized metallic subwavelength features. Finite element simulations were performed to predict the PN focal length and beam spot size, and nanofeature formation. A systematic approach was employed to functionalize metallic surface by varying the pulse energy, focal offset, and number of pulses to fabricate controlled array of nanoholes and to study the generation of triangular and rhombic laser-induced periodic surface structures (LIPSS). Finally, large-area texturing was investigated to minimize the dry laser cleaning (DLC) effect and improve homogeneity of PN-assisted texturing. Tailored dimensions and densities of achievable surface patterns could provide hexagonal light scattering and selective optical reflectance for a specific light wavelength. Surfaces exhibited controlled wetting properties with either hydrophilicity or hydrophobicity. No correlation was found between wetting and microbacterial colonization properties of textured metallic surfaces after 4 h incubation of Escherichia coli. However, an unexpected bacterial repellency was observed.

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Photonic jet generated by spheroidal particle with Gaussian-beam illumination

Cited by 52 publications

References 55 publications

Photonic nanojets in optical tweezers

Photonic nanojets in optical tweezers

Numerical Study of Tunable Photonic Nanojets Generated by Biocompatible Hydrogel Core-Shell Microspheres for Surface-Enhanced Raman Scattering Applications

Subwavelength Direct Laser Nanopatterning Via Microparticle Arrays for Functionalizing Metallic Surfaces

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