Off-axis multi-wavelength dispersion controlling metalens for multi-color imaging

Dou, Kaihua; Xie, Xin; Pu, Mingbo; Li, Xiong; Ma, Xiaoliang; Wang, Changtao; Luo, Xiangang

doi:10.29026/oea.2020.190005

Cited by 92 publications

(40 citation statements)

References 35 publications

(39 reference statements)

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“…In addition, the concepts demonstrated in refs. [37][38][39] provide a new perspective for further increasing the transmission efficiency and controlling the chromatic aberration Our work is highlighted in grey of meta-fibres. Furthermore, we envision the use of our UNM as a fibre-optic endoscope, as demonstrated in ref.…”

Section: Discussionmentioning

confidence: 99%

Ultrahigh numerical aperture meta-fibre for flexible optical trapping

et al. 2021

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Strong focusing on diffraction-limited spots is essential for many photonic applications and is particularly relevant for optical trapping; however, all currently used approaches fail to simultaneously provide flexible transportation of light, straightforward implementation, compatibility with waveguide circuitry, and strong focusing. Here, we demonstrate the design and 3D nanoprinting of an ultrahigh numerical aperture meta-fibre for highly flexible optical trapping. Taking into account the peculiarities of the fibre environment, we implemented an ultrathin meta-lens on the facet of a modified single-mode optical fibre via direct laser writing, leading to a diffraction-limited focal spot with a record-high numerical aperture of up to NA ≈ 0.9. The unique capabilities of this flexible, cost-effective, bio- and fibre-circuitry-compatible meta-fibre device were demonstrated by optically trapping microbeads and bacteria for the first time with only one single-mode fibre in combination with diffractive optics. Our study highlights the relevance of the unexplored but exciting field of meta-fibre optics to a multitude of fields, such as bioanalytics, quantum technology and life sciences.

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Section: Discussionmentioning

confidence: 99%

Ultrahigh numerical aperture meta-fibre for flexible optical trapping

et al. 2021

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“…To minimize the influence of adjacent coupling, a careful choice of the geometric parameters is often needed. [127][128][129] Furthermore, the elimination of the effect of near-field evanescent coupling on the focusing efficiency is still a challenge. [130] Compared with the dielectric flat lens, the metallic one may have relatively low efficiency, but the polarization selectivity is much higher.…”

Section: Generalized Laws Of Refraction and Reflectionmentioning

confidence: 99%

“…To minimize the influence of adjacent coupling, a careful choice of the geometric parameters is often needed. [ 127–129 ] Furthermore, the elimination of the effect of near‐field evanescent coupling on the focusing efficiency is still a challenge. [ 130 ]…”

Section: Catenary Functions For Generalized Optical Lawsmentioning

confidence: 99%

Catenary Functions Meet Electromagnetic Waves: Opportunities and Promises

Luo

Guo

et al. 2020

Advanced Optical Materials

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with the development of nanofabrication, characterization, and numerical modeling techniques, research has focused on optical applications in the subwavelength region, where the characteristic dimension of light-matter interactions is below the operating wavelength. [7,8] It was found that catenary functions have played more important roles in this new realm. [9] First, the coupling of evanescent waves, such as surface plasmon polaritons (SPPs) leads to catenary-shaped intensity distributions, [10,11] which have found practical applications in super-resolution imaging and lithography. [12-15] Second, catenaryshaped subwavelength structures have been proved to be ideal candidates for generating geometric phases, which are widely utilized to construct various functional metasurfaces. [2,16-18] Furthermore, besides the field intensity distribution, the dispersion curves of many capacitive metasurfaces were found to be characterized by the catenary function, [3] which provides a versatile mathematical-physical model to predict the optical and electromagnetic properties of metasurfaces. The application of mathematical functions in classical optical problems is a well-established phenomenon. For instance, in geometric optics governed by Fermat's principle and Snell's law, the surfaces of lenses and mirrors have spherical, parabolic, or aspherical shapes to focus light on a given spot. In laser optics, the characteristics of laser beams are characterized by mathematical functions, such as the Gaussian function, Bessel function, Airy function, and Hermite and Laguerre polynomials. [19-21] In addition, the dispersion curve of an anisotropic material is described by an ellipse. If one of the dielectric tensors were to become negative, the dispersion curve would become hyperbolic. Such materials are therefore called hyperbolic materials. [22,23] Because of the unusual dispersion curve, hyperbolic materials could be used in super-resolution imaging as well as enhancement of spontaneous emission. In this review, we focus on the applications of catenary functions in optics and electromagnetics. There are two types of catenary functions, the hyperbolic cosine function (ordinary catenary) and the logarithmic cosine function, which is often called catenary of equal strength. [1] As shown in Figure 1, both curves resemble the parabolic curve for vanishingly small x values. As x increases, the discrepancy increases and the slope of the catenary of equal strength is the largest among the three curves. Like the parabola, both types of catenary functions Catenary functions play pivotal roles in describing the electromagnetic vectors, intensity distribution, and dispersion of structured light on the subwavelength scale. In this article, the history, basic theories, functional devices, and applications of catenary functions in optics and electromagnetics are reviewed. First, the catenary fields generated by the coupling of evanescent waves are discussed, together with their applications in flat optics, super-resolution imaging, and lith...

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“…Metasurface, a new kind of artificial flat optical element, has become an ideal optical material due to its ability DOI: 10.1002/adts.202000239 to control electromagnetic waves in the subwavelength range and its relatively convenient processing. [1][2][3][4][5][6][7][8][9][10] However, most of the demonstrated metasurfaces control spatial light to realize functions, such as deflection, [11,12] orbital angular momentum (OAM) generation, [13,14] focusing, [15,16] and holography, [17,18] which makes it difficult to achieve full on-chip integration.…”

Section: Introductionmentioning

confidence: 99%

Monolithic‐Integrated Multiplexed Devices Based on Metasurface‐Driven Guided Waves

Guo

et al. 2021

Advcd Theory and Sims

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The appearance of metasurfaces has solved the difficult problems of bulkiness, the complexity of traditional optics, and arbitrary optical response controlling. However, most free‐space metasurfaces and existing integrated metadevices do not meet the criteria of full on‐chip integration toward low loss and high information transmission capacity. Here, by decorating silicon‐on‐insulator waveguides with metasurfaces, one can realize the arbitrary phase and intensity manipulation of guided waves. Four‐channel multiplexer is demonstrated with inherent advantages of low loss and independent transmission of electromagnetic waves in x and y directions. As proof‐of‐concept demonstrations, monolithic‐integrated multiplexed orbital angular momentum (OAM) and holographic generators are developed at 1550 nm to realize high information transmission capacity, low loss, and low crosstalk. Specifically, when the electromagnetic wave is incident from x, −x, y, and −y directions, four kinds of OAM mode with different topological charge values (−1, +1, +2, and −2), and four different holographic images of the letter “U,” “C,” “A,” and “S” can be obtained with the four‐channel multiplexed OAM generator and holographic display device, respectively. The design methods proposed here are expected to open a new perspective for future versatile utilization of driven guided waves to achieve numerous functionalities.

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Off-axis multi-wavelength dispersion controlling metalens for multi-color imaging

Cited by 92 publications

References 35 publications

Ultrahigh numerical aperture meta-fibre for flexible optical trapping

Ultrahigh numerical aperture meta-fibre for flexible optical trapping

Catenary Functions Meet Electromagnetic Waves: Opportunities and Promises

Monolithic‐Integrated Multiplexed Devices Based on Metasurface‐Driven Guided Waves

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