Focus modulation of cylindrical vector beams through negative-index grating lenses

Wang, Sheng-Ming; Xu, Ji; Zhong, Yi; Ren, Rong; Lu, Yunqing; Wan, Hongdan; Wang, Jin; Ding, Jianping

doi:10.1016/j.optcom.2016.04.035

Cited by 8 publications

(2 citation statements)

References 24 publications

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“…This property is of great importance in applications such as microscopes45 and optical data storage6. Generation of a sub-wavelength focal spot with a strong longitudinal electric field has been theoretically proposed using various methods, such as use of a parabolic mirror7, the combination of a binary optical phase filter and a conventional high-numerical-aperture optical lens89101112, a negative-index grating lens13, a 4π high-numerical-aperture focusing system14, and absorbance modulation15. Compared with conventional optical lenses, planar lenses are attractive because they are small, lightweight, and easily integrated.…”

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confidence: 99%

Creation of Sub-diffraction Longitudinally Polarized Spot by Focusing Radially Polarized Light with Binary Phase Lens

Yu¹,

Chen²,

Zhang³

et al. 2016

Sci Rep

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The generation of a sub-diffraction longitudinally polarized spot is of great interest in various applications, such as optical tweezers, super-resolution microscopy, high-resolution Raman spectroscopy, and high-density optical data storage. Many theoretical investigations have been conducted into the tight focusing of a longitudinally polarized spot with high-numerical-aperture aplanatic lenses in combination with optical filters. Optical super-oscillation provides a new approach to focusing light beyond the diffraction limit. Here, we propose a planar binary phase lens and experimentally demonstrate the generation of a longitudinally polarized sub-diffraction focal spot by focusing radially polarized light. The lens has a numerical aperture of 0.93 and a long focal length of 200λ for wavelength λ = 632.8 nm, and the generated focal spot has a full-width-at-half-maximum of about 0.456λ, which is smaller than the diffraction limit, 0.54λ. A 5λ-long longitudinally polarized optical needle with sub-diffraction size is also observed near the designed focal point.

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confidence: 99%

Creation of Sub-diffraction Longitudinally Polarized Spot by Focusing Radially Polarized Light with Binary Phase Lens

Yu¹,

Chen²,

Zhang³

et al. 2016

Sci Rep

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“…Different vector light fields can be obtained by adjusting the optical path or element, which makes the generation of vector light fields diverse. The main devices involved are the optical metasurface [14,15], q plate [16], cylindrical lens [17,18], bifurcated grating [19], spiral phase plate [20,21], and SLM [22]. Among them, the polarization state and complex amplitude distribution of the vector light field can be adjusted in real time by means of an SLM, which highlights the flexibility of the extra-cavity method.…”

Section: Introductionmentioning

confidence: 99%

Multi-Mode Vector Light Field Generation Using Modified Off-Axis Interferometric Holography and Liquid Crystal Spatial Light Modulators

Zhu,

Gao,

et al. 2023

Photonics

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The increasing enhancement in the modulation accuracy of spatial light modulators has garnered significant attention towards real-time control technology for light fields based on these modulators. It has been demonstrated that this technology possesses a remarkable capability to generate vector beams with arbitrary complex amplitude distributions. Nevertheless, past studies indicate that the generation of only one vector beam at a time has been observed. The simultaneous generation of numerous vector light fields can give rise to several challenges, including compromised picture quality, limited single-mode operation, and intricate optical path configurations. In pursuit of this objective, we present a novel methodology that integrates the coding methodology of modified off-axis interferometric holography with the idea of optical superposition. This technique facilitates the concurrent generation of several vector beams. In this study, we present a demonstration of the simultaneous creation of twelve vector beams using a single spatial light modulator (SLM) as a proof of concept. Significantly, this technology has the ability to generate an unlimited quantity of vector light fields concurrently under the assumption that the resolution of the SLM does not impose any limitations. The findings indicate that the imaging quality achieved by this technology is of a high standard. Furthermore, it is possible to separately control the beam waist radius, topological charge, polarization order, and extra phase of each beam.

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Generation of subdiffraction longitudinal bifoci by shaping a radially polarized wave

et al. 2020

Appl. Opt.

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Lenses with two or more foci along the longitudinal direction exhibit immense potential in several optical applications. In this study, we propose an approach for generating subdiffraction longitudinal bifoci by binary-phase bifocal super-oscillatory lenses (SOLs), which are realized by simple AND operation between two single-foci SOLs with different focal lengths. Three bifocal SOLs with r a d i u s R l e n s = 70 λ are designed at an operating wavelength of λ = 118.8 µ m . Simulation results demonstrate that the minimum full width at half maximum (FWHM) is 0.397 λ , and the maximum FWHM is 0.449 λ , which is still smaller than the Abbe diffraction limit of 0.510 λ , while all the sidelobe ratios are small ( < Privacy Policy and Terms of Service apply.

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