Photonic Jets Formation by Non Spherical Axially and Spatially Asymmetric 3D Dielectric Particles

Minin, Igor V.; Minin, Oleg V.

doi:10.1007/978-3-319-24253-8_4

Cited by 3 publications

(1 citation statement)

References 61 publications

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“…It can be seen that, in comparison with the far field scattering in the near field, the incident electromagnetic waves can be highly concentrated and a narrow, high-intensity, beam propagates toward the shadow side of the dielectric sphere. Such kind jet-like structure has been called 'photonic jet' and relates with spherical particle surface curvature, which causes relevant deformation of the incident phase wave front [39,40].…”

Section: Resultsmentioning

confidence: 99%

Terajet-assisted time-domain super-resolution imaging

Paddubskaya,

Valynets,

Novitsky

et al. 2024

J. Phys. D: Appl. Phys.

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Large-scale applications of real-time terahertz (THz) imaging are often limited by the spatial resolution of a THz microscope. One of the simplest approaches to circumvent this problem in practice and achieve resolution below the diffraction limit consists in placing a dielectric particle with a size comparable to the radiation wavelength in the vicinity of the focal plane of the THz imaging system. Here, we theoretically consider the transmittance of a THz Gaussian beam through a Teflon sphere to further analyze experimental results on THz superresolution imaging. We address the resolution beyond the diffraction limit (the experimentally determined value is 0.38λ at 0.46 THz) through the superlens effect of the terajet generated by the mesoscale sphere owing to propagating and evanescent partial waves in the terajet. Due to the coupling of the dielectric sphere and time-domain THz spectrometer, we can detect a 10 µm thick PTEF film, which is almost transparent (98% transmittance) in the THz frequency range. The correlation between the transmittance spectrum of the dielectric sphere and the quality of THz images of thin, nonconducting films collected at different frequencies has been demonstrated experimentally and considered analytically. Our study is relevant for hyperspectral imaging applications and further development of the sphere-coupled time-domain THz imaging technique.

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Section: Resultsmentioning

confidence: 99%

Terajet-assisted time-domain super-resolution imaging

Paddubskaya,

Valynets,

Novitsky

et al. 2024

J. Phys. D: Appl. Phys.

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Terahertz tunable three-dimensional photonic jets

Rezaei,

Yahyapour,

Darafsheh

2024

Sci Rep

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Highly localized electromagnetic field distributions near the “shadow-side” surface of certain transparent mesoscale bodies illuminated by light waves are called photonic jets. We demonstrated formation of three-dimensional (3D) tunable photonic jets in terahertz regime (terajets, TJs) by dielectric micro-objects -including spheres, cylinders, and cubes-coated with a bulk Dirac semimetal (BDS) layer, under uniform beam illumination. The optical characteristics of the produced TJs can be modulated dynamically through tuning the BDS layer’s index of refraction via changing its Fermi energy. It is demonstrated that the Fermi energy of BDS layer has a significant impact on tuning the optical characteristics of the produced photonic jets for both TE and TM polarizations. A notable polarization dependency of the characteristics of the TJs was also observed. The impact of obliquity of the incident beam was studied as well and it was demonstrated that electromagnetic field distributions corresponding to asymmetric photonic jets can be formed in which the intensity at the focal region is preserved in a wide angular range which could find potential application in scanning devices. It was found that the maximum intensity of the TJ occurs at a non-trivial morphology-dependent source-angle.

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Side-lobes-controlled photonic nanojet with a horizontal graded-index microcylinder

Xing

Zhou

2018

Opt. Lett.

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A photonic nanojet generated by the transparent dielectric microparticle (microsphere or microcylinder) is a sub-wavelength focused beam. The properties of the photonic nanojet have been modified by changing the refractive index and structure of the micropaticles. In this Letter, a super-narrow photonic nanojet with a full width at half-maximum waist of approximately 116.6 nm (λ/4.3, with 500 nm excitation wavelength) is obtained by a horizontal graded-index microcylinder, which is divided by multilayers parallel to the direction of light propagation. The method for side lobes controlling by the waves' superposition from the modified graded refractive index and that of the center layer is proposed and discussed. Also, a structure with the composition of different height plates approaching the desired circular section is suggested for decreasing the difficulties in fabrication, and generates a similar photonic nanojet.

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Photonic Jets Formation by Non Spherical Axially and Spatially Asymmetric 3D Dielectric Particles

Cited by 3 publications

References 61 publications

Terajet-assisted time-domain super-resolution imaging

Terajet-assisted time-domain super-resolution imaging

Terahertz tunable three-dimensional photonic jets

Side-lobes-controlled photonic nanojet with a horizontal graded-index microcylinder

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