Breaking the Diffraction Limit with Radially Polarized Light Based on Dielectric Metalenses

Zuo, Ruizhi; Liu, Wenwei; Cheng, Hua; Chen, Shuqi; Tian, Jianguo

doi:10.1002/adom.201800795

Cited by 77 publications

(40 citation statements)

References 42 publications

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“…This revolutionary capability of simultaneous control of multiple dimensions of optical field enabled by metasurfaces makes it possible to produce more novel phenomena, and to encourage more available applications, such as the accurate and robust transmission of optical information. One significant advantage of multidimensional manipulation is to realize integrated photonic devices, which may strikingly reduce the size and enhance the performance of the devices due to the compact manipulation. Another intriguing application is artificial intelligence enhanced photonic techniques, such as a photonic neural network.…”

Section: Discussionmentioning

confidence: 99%

From Single‐Dimensional to Multidimensional Manipulation of Optical Waves with Metasurfaces

et al. 2019

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given refractive indices. The limited refractive indices of natural materials prevent the generation of new optical phenomena. The size and weight of traditional optical devices also prevent optical system miniaturization and integration. Nowadays, there is an everincreasing demand for new approaches to implement the effective manipulation of optical waves in different dimensions and to get the novel optical devices on demand.With the development of nanofabrication technology, artificial nanostructures become approachable which offer a promising solution to the achievement of efficient manipulation of optical waves in different dimensions. Metamaterials, which attain their optical functionalities from the subwavelength structures rather than their constitutive materials, provided intriguing possibilities for the evolution of modern optics and have attracted great interest from the scientific community over the past twenty years. [1][2][3] By judiciously modulating their subwavelength structure parameters, the effective values of the permeability and permittivity of the metamaterials can be designed on purpose to realize the manipulation of optical waves in a spectific dimension and to get the desirable optical functionalities, which are even not achievable with natural materials. Previous works have demonstrated that metamaterials can be widely applied in realizing negative refractive index, [4][5][6] electromagnetic invisibility cloaks, [7,8] optical black holes, [9] chiral media, [10,11] and so on. However, the commercialization of metamaterial-based optical devices in real applications is still challenging, which we ascribe to the strong dispersion and high losses associated with typically used metallic structures, and also the difficult and costly fabrication for 3D designs.Recently, planar metamaterials or metasurfaces have received great attention for their advantages to meet these challenges. [12][13][14] Compared to metamaterials, metasurfaces, as artificial planar designs, have dramatically reduced the fabrication complexity. Moreover, the thickness of metasurfaces is less than or similar to the wavelength of operating waves, which results in the reduction of the undesirable losses and offers an effective manner for implementing tunable and reconfigurable optical devices. Overall, metasurfaces provide an effective way to overcome the challenges in metamaterials, and it has been successfully proven that metasurfaces are more feasible for the engineering of the fundamental dimensions of optical Metasurfaces, 2D artificial arrays of subwavelength elements, have attracted great interest from the optical scientific community in recent years because they provide versatile possibilities for the manipulation of optical waves and promise an effective way for miniaturization and integration of optical devices. In the past decade, the main efforts were focused on the realization of single-dimensional (amplitude, frequency, polarization, or phase) manipulation of optical waves. Compared to the metasurfaces with sing...

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Section: Discussionmentioning

confidence: 99%

From Single‐Dimensional to Multidimensional Manipulation of Optical Waves with Metasurfaces

et al. 2019

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“…However, the plasmonic metasurface exhibits only 30% efficiency for linearly polarized incidence at 900 nm. To reduce ohmic losses in plasmonic metasurfaces and improve efficiency, dielectric designs 105,106 have been introduced to generate a desired vectorial optical eld. 107 The unit cell of the dielectric metasurface is schematically depicted in Fig.…”

Section: Simultaneous Control Of Multiple Properties Of Output Light mentioning

confidence: 99%

Controlling the degrees of freedom in metasurface designs for multi-functional optical devices

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“…For applications where polarization insensitivity is crucial, one can use instead isotropic nanostructures such as pillars or squares . A similar approach of using more complicated shapes would be necessary for the angular dispersion engineering of other devices such as Fourier or subresolution metalenses . Another intriguing possibility is the use of topology optimization to design freeform shapes with these desired functionalities …”

Section: Metasurface As Aberration Correctormentioning

confidence: 99%

Compact Aberration‐Corrected Spectrometers in the Visible Using Dispersion‐Tailored Metasurfaces

Zhu

Chen

Sisler

et al. 2018

Advanced Optical Materials

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The key components of a spectrometer are a dispersive element, such as a grating, followed by a focusing lens. These are usually arranged in a Czerny-Turner configuration. [7] However, different wavelengths of incident light are focused along a curved surface as opposed to a planar one; as a result the focal spot broadens and becomes aberrated due to astigmatism and field curvature. [7] These factors result in a tradeoff between the spectral resolution, which is related to the size and quality of the focal spot, and the spectral range of the spectrometer.Conventional methods to overcome this challenge involve additional optical components (e.g., multiple lenses) or precisely machined parts to correct for these aberrations, such as wedge-shaped cylindrical lenses, [8] toroidal gratings, [9] and freeform elements. [10] These are typically fabricated from aspheric blanks and introduce a significant overhead in terms of overall device cost and complexity. This also poses a significant challenge for truly compact, low-cost, handheld aberration-corrected spectrometers.Recently, metasurfaces comprising of subwavelength scale nanostructures have received much attention from the research community. [11] They allow for exquisite control over the output wavefront of light, [12][13][14][15] and have been used to demonstrate ultracompact analogs of numerous optical components, such as lenses, [16][17][18] holograms, [19][20][21] and polarimeters. [22][23][24] An important advantage of metasurfaces is their ability to integrate multiple functionalities within a single planar device, thereby greatly reducing bulk and system complexity. For example, in an earlier work, [25] we demonstrated off-axis focusing metalenses capable of simultaneously focusing and dispersing light: they thus integrate the functionality of both the grating and the focusing lens in a single optical component. Additionally, by engineering the off-axis focusing angle very large dispersions can be obtained; [26] this allows one to achieve a miniature spectrometer with subnanometer resolution with a working distance of only a few centimeters from the lens to the detector. This distance is not fundamentally limited in any way; it is dependent on the desired specifications of the metalens, and in principle could even be much smaller, enabling monolithic integration with detectors.However, these off-axis focusing metalenses face the same challenges as their refractive and diffractive counterparts [27][28][29][30] The spectral resolution and range of conventional spectrometers are typically limited by optical aberrations of their focusing elements, mainly due to chromatically induced astigmatism and an intrinsically curved focal plane. Traditional approaches to overcome this challenge require additional optical components which introduce significant bulk and design complexity to the system and prevent easy integration with portable devices. Here a single planar off-axis focusing metalens consisting of subwavelength TiO 2 nanofins whose focal spots lie along a pla...

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Breaking the Diffraction Limit with Radially Polarized Light Based on Dielectric Metalenses

Cited by 77 publications

References 42 publications

From Single‐Dimensional to Multidimensional Manipulation of Optical Waves with Metasurfaces

From Single‐Dimensional to Multidimensional Manipulation of Optical Waves with Metasurfaces

Controlling the degrees of freedom in metasurface designs for multi-functional optical devices

Compact Aberration‐Corrected Spectrometers in the Visible Using Dispersion‐Tailored Metasurfaces

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