Generation of super-length optical needle by focusing hybridly polarized vector beams through a dielectric interface

Hu, Kelei; Chen, Ziyang; Pu, Jixiong

doi:10.1364/ol.37.003303

Cited by 53 publications

(36 citation statements)

References 17 publications

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“…To further improve the optical resolution, it would be attractive to a method of creating nondiffracting beams with sub-diffraction transverse dimensions. The generation of sub-wavelength 14 and sub-diffraction 15 optical needles has also been theoretically studied. Optical super-oscillation is referred to the optical phenomenon, in which the local spatial frequency of the optical field is larger than its global spatial frequency, and theoretically, it provides a possible means of creating arbitrary small features in far-field optics with the superposition of band-limited functions 16, 17 .…”

Section: Introductionmentioning

confidence: 99%

Planar binary-phase lens for super-oscillatory optical hollow needles

Chen

et al. 2017

Sci Rep

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Optical hollow beams are suitable for materials processing, optical micromanipulation, microscopy, and optical lithography. However, conventional optical hollow beams are diffraction-limited. The generation of sub-wavelength optical hollow beams using a high numerical aperture objective lens and pupil filters has been theoretically proposed. Although sub-diffraction hollow spot has been reported, nondiffracting hollow beams of sub-diffraction transverse dimensions have not yet been experimentally demonstrated. Here, a planar lens based on binary-phase modulation is proposed to overcome these constraints. The lens has an ultra-long focal length of 300λ. An azimuthally polarized optical hollow needle is experimentally demonstrated with a super-oscillatory transverse size (less than 0.38λ/NA) of 0.34λ to 0.42λ, where λ is the working wavelength and NA is the lens numerical aperture, and a large depth of focus of 6.5λ. For a sub-diffraction transverse size of 0.34λ to 0.52λ, the nondiffracting propagation distance of the proposed optical hollow needle is greater than 10λ. Numerical simulation also reveals a good penetrability of the proposed optical hollow needle at an air-water interface, where the needle propagates through water with a doubled propagation distance and without loss of its super-oscillatory property. The proposed lens is suitable for nanofabrication, optical nanomanipulation, super-resolution imaging, and nanolithography applications.

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Section: Introductionmentioning

confidence: 99%

Planar binary-phase lens for super-oscillatory optical hollow needles

Chen

et al. 2017

Sci Rep

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“…One of the fundamental issues is whether the focal configurations would remain after passing through a boundary. Török et al [8], Gu [9], Novotny and Hecht [10], Pu and co-workers [11], and Biss and Brown [12] deduced rigorous solutions to the problem of focusing into an isotropic medium. However, there is a wide range of materials, such as uniaxial crystals (UCs), biaxial crystals, liquid crystals, fluorophores [13], and some biological tissues [14], possessing anisotropic properties.…”

Section: Introductionmentioning

confidence: 99%

Optical sharper focusing in an anisotropic crystal

Wang

Xie

et al. 2015

J. Opt. Soc. Am. A

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Optical super-resolution technique through tight focusing is a widely used technique to image material samples with anisotropic optical properties. The knowledge of the field distribution of a tightly focused beam in anisotropic media is both scientifically interesting and technologically important. In this paper, the optical properties of a uniaxial crystal with the optic axis perpendicular to the interface under a tight focusing configuration are studied with rigorous theoretical and numerical analysis. The significant effect of the Poynting vector on the focal position introduces an obvious displacement of the focal spot formed by the extraordinary waves (e-ray). Moreover, a sharper focus with a lateral size of 0.22λ is obtained as a result of the effective separation of the ordinary waves (o-ray) and the e-ray. It provides a new tool to fabricate optical structures with higher resolutions than that in an isotropic medium through the far-field method.

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“…Recently Kelei Hu etal investigated the focusing properties of a hybrid polarized beam through a dielectric interface focused by an annular high-NA lens. It is observed that the system generates a needle of transversally polarized field with homogeneous intensity long the optical axis with ultra-long focal depth of (∼14λ), and sub diffraction beam size of (∼0.9λ) 8 . Jianhua Shu etal illustrated that focusing of a double-ringshaped azimuthally polarized vector beam) through a dielectric interface focused by an annular high-NA objective lens can generate a ultra long focal hole (∼106λ) of sub wavelength size (∼0.5λ) 9 .…”

Section: Introductionmentioning

confidence: 99%

Generation of super long dark channel using annular multi-Gaussian beam

Lavanya

Udhayakumar²,

Shanmugapriya

et al. 2015

SPIE Proceedings

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According to Vector diffraction theory, focusing properties of azimuthally polarized annular multi Gaussian beam through dielectric interface is numerically studied. It is observed that the presence of dielectric interface generates focal shift and the inclusion of annular obstruction at the aperture enhances the focal depth and minimized the focal hole size. By properly tuning the annular obstruction, a focal hole of FWHM 0.606 λ having super long focal depth of 3080λ is achieved. The focal depth of the dark channel achieved is found to be much larger than all the previously proposed methods.Vector diffraction theory, MultiGaussian beam, Azimuthally polarized beam.

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Generation of super-length optical needle by focusing hybridly polarized vector beams through a dielectric interface

Cited by 53 publications

References 17 publications

Planar binary-phase lens for super-oscillatory optical hollow needles

Planar binary-phase lens for super-oscillatory optical hollow needles

Optical sharper focusing in an anisotropic crystal

Generation of super long dark channel using annular multi-Gaussian beam

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