Regulation and characterization of photonic hook of eccentric ellipsoidal particles

Xie, Shuyue; Han, Guoxia; Zhang, Jialing; Ma, Yanbin; Zhao, Li; Liu, Peng

doi:10.1016/j.optcom.2024.130312

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…These methods with their advantages and limitations are extensively discussed in detail in the provided [29]. Recently, a study highlighted the fabrication of eccentric ellipsoidal structures [30]. According to their findings, an eccentric structure can be created by employing a combination of 3D nanolithography, ensuring sub-nanometer level precision, along with atomic layer deposition (ALD) to precisely control the thickness of the structure.…”

Section: Introductionmentioning

confidence: 99%

Photonic hook propagation from eccentric microcylinder

Das,

Saha,

Vadivel

2024

Phys. Scr.

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The Photonic hook (PH) is an intricately curved photonic nanojet (PNJ) or a highly intense electromagnetic beam featuring a subwavelength waist, whose principal hallmark lies in its capacity to bend light at the nanoscale. According to existing literature, the origin of PH can be attributed to symmetry breaking, whereas symmetrical microstructures predominantly contribute to PNJ formation. This study presents the novel revelation of PH emergence from an isolated eccentric core-shell dielectric microcylinder, achieved through the illumination of a paraxial Gaussian beam (PGB). The eccentrically structured core-shell microscale geometry introduces an additional degree of freedom, influencing PH formation and directly shaping its characteristic parameters. Much like PNJ, the propagation of PH depends on different parameters such as core and shell refractive indices of the micro-structures, microstructure geometry, incident light type, and direction of propagation. A fascinating outcome from our numerical simulations is the switchable occurrence of PNJ and PH from an eccentric core-shell microcylinder by a simple adjustment of eccentricity, either parallel or perpendicular to the PGB's propagation direction. This computational investigation emphasizes the impact of eccentricity and the incident wave's beam waist, maintaining a consistent refractive index contrast between the core and shell. The outcomes are interpreted in terms of key parameters governing PH generation characteristics, encompassing FWHM, maximum electric field enhancement, and focal plane. Notably, we have observed the coexistence of whispering gallery modes (WGM) and PH within this system and these modes exhibit high sensitivity to the excitation wavelength. The potential applications of PH are believed to be far-reaching, including areas like optical trapping, sensing, and functioning as a versatile focusing element. This study not only contributes to our fundamental understanding of PH but also illuminates its potential as a robust tool across diverse optical applications.

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Section: Introductionmentioning

confidence: 99%

Photonic hook propagation from eccentric microcylinder

Das,

Saha,

Vadivel

2024

Phys. Scr.

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A study on hybrid light extinction model and inversion based on Lambert-Beer Law

Su,

Deng,

Sun

et al. 2025

Optics Communications

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Photonic hook shaping achieved by the micro-nano fiber array based Janus cylindrical metalens

Dinh,

Wu,

Chen

et al. 2024

Phys. Scr.

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Near-field focusing of an electromagnetic wave on the assembly of hexagonally asymmetric arranged close-contact nanofibers into a cylindrical Janus metalens is considered for different fiber sizes and optical properties. We propose combining the meta-material concept with a photonic hook based on the finite-difference time-domain technique. Simulation results show that the cylindrical meta-photonic Janus structure produces the focal region of enhanced optical intensity, which exists in the spatial form of a localized structured light known as a photonic hook. A detailed study of all key parameters of a photonic hook depending on the Janus metalens topology and optical properties of the fiber filling is carried out. The structure conditions have been determined for the beam waist of a photonic hook that is less than the diffraction limit. This Janus cylindrical metalens may contribute to the versatile control of photonic hook generation in the applications of bio-photonics and optical microscopes.

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Regulation and characterization of photonic hook of eccentric ellipsoidal particles

Cited by 3 publications

References 29 publications

Photonic hook propagation from eccentric microcylinder

Photonic hook propagation from eccentric microcylinder

A study on hybrid light extinction model and inversion based on Lambert-Beer Law

Photonic hook shaping achieved by the micro-nano fiber array based Janus cylindrical metalens

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