Mechanically tunable focusing metamirror in the visible

Cheng, Fei; Qiu, Liangyu; Nikolov, Daniel; Bauer, Aaron; Rolland, Jannick P.; Vamivakas, A. Nick

doi:10.1364/oe.27.015194

Cited by 30 publications

(15 citation statements)

References 64 publications

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“…Vamivakas et al. [ 110 ] adopted a similar approach to realize the first reflective mechanical tunable meta‐lens at a wavelength of 670 nm based on gap surface plasmonic resonators. The focal length could be continuously adjusted by up to 45% with 20% lateral PDMS stretching, while maintaining a high focusing performance comparable to that reported in ref.…”

Section: Functionalitiesmentioning

confidence: 99%

“…The weak optical coupling between the nanoposts allows the tunable meta-lens to operate at a wavelength of 915 nm through radial strain, providing an efficiency of ≈50%, focal distance tunability from 600 µm to 1400 µm, and polarization independence (Figure 10d). Vamivakas et al [110] adopted a similar approach to realize the first reflective mechanical tunable meta-lens at a wavelength of 670 nm based on gap surface plasmonic resonators. The focal length could be continuously adjusted by up to 45% with 20% lateral PDMS stretching, while maintaining a high focusing performance comparable to that reported in ref.…”

Section: Inherent Tunabilitymentioning

confidence: 99%

“…[109]. Although meta-lenses based on flexible substrates can support focal length tuning, most reported works [108][109][110] required an external stretching mechanism that had a long response time.…”

Section: Inherent Tunabilitymentioning

confidence: 99%

See 2 more Smart Citations

Principles, Functions, and Applications of Optical Meta‐Lens

Chen

Feng

et al. 2021

Advanced Optical Materials

163

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A meta‐lens is an advanced flat optical device composed of artificial antennas. The amplitude, phase, and polarization of incident light can be engineered to satisfy the application requirements of meta‐lenses. Meta‐lenses can be designed to achieve a variety of functions, such as diffraction‐limited focusing, high focusing efficiency, and aberration correlation, which are useful in various application scenarios. This review focuses on the recent progress in meta‐lenses, from fundamentals to applications. The present challenges in this domain are summarized and future prospects are offered. The primary aim of this review is to provide the reader with a comprehensive understanding of meta‐lenses and potential inspiration for designing high‐performance meta‐lenses for feasible applications.

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Section: Functionalitiesmentioning

confidence: 99%

Section: Inherent Tunabilitymentioning

confidence: 99%

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Principles, Functions, and Applications of Optical Meta‐Lens

Chen

Feng

et al. 2021

Advanced Optical Materials

163

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“…Besides tuning the orientation of the unit cells and moving the doublets longitudinally, varying the relative position of each scattering element in metasurfaces also alters the phase discontinuity. One method is to fabricate the metasurface on flexible substrates and to stretch it mechanically [109,110]. The centrosymmetric Au nanorods are stripped into polydimethylsiloxane (PDMS) to generate a spherical wavefront [110].…”

Section: Manipulation Of Wavefront: Metalens With Tunable Focusmentioning

confidence: 99%

Metamaterials – from fundamentals and MEMS tuning mechanisms to applications

2020

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Metamaterials, consisting of subwavelength resonant structures, can be artificially engineered to yield desired response to electromagnetic waves. In contrast to the naturally existing materials whose properties are limited by their chemical compositions and structures, the optical response of metamaterials is controlled by the geometrics of resonant unit cells, called “meta-atoms”. Many exotic functionalities such as negative refractive index, cloaking, perfect absorber, have been realized in metamaterials. One recent technical advance in this field is the active metamaterial, in which the structure of metamaterials can be tuned to realize multiple states in a single device. Microelectromechanical systems (MEMS) technology, well-known for its ability of reconfiguring mechanical structures, complementary metal-oxide-semiconductor (CMOS) compatibility and low power consumption, is perfectly suitable for such purpose. In the past one decade, we have seen numerous exciting works endeavoring to incorporate the novel MEMS functionalities with metamaterials for widespread applications. In this review, we will first visit the fundamental theories of MEMS-based active metamaterials, such as the lumped circuit model, coupled-mode theory, and interference theory. Then, we summarize the recent applications of MEMS-based metamaterials in various research fields. Finally, we provide an outlook on the future research directions of MEMS-based metamaterials and their possible applications.

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“…Development of the optical metasurfaces [1][2][3] in the recent years allowed to overcome the limitations of the conventional optical components [4][5][6][7]. The main advantages of the metasurfaces as compared to their traditional counterparts are compactness (sub-wavelength thickness) [8][9][10], multi-functionality [11][12][13][14][15], active and reversible control of the dynamic response [16][17][18][19][20][21][22][23]. This advantage revealed many features and functionalities that were not attainable with conventional optical components [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Use of monocrystalline gold flakes for gap plasmon-based metasurfaces operating in the visible

Boroviks

Todisco

Mortensen

et al. 2019

Opt. Mater. Express

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Gap plasmon-based optical metasurfaces have been extensively used for demonstration of flat optical elements with various functionalities efficiently operating at near-infrared and telecom wavelengths. Extending their operation to the visible is however impeded by the progressively increased plasmon absorption for shorter wavelengths. We investigate the possibility to improve the performance of gap plasmon-based metasurfaces in the visible by employing monocrystalline gold flakes as substrates instead of evaporated polycrystalline gold films, while using the electron-beam lithography patterning of the evaporated thin gold films for fabrication of top gold nanobricks, which define gap-plasmon resonator elements of the metasurfaces. We demonstrate that the efficiency can be improved by modest but noticeable amount of ≈ 5% if all other configuration parameters are preserved.

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Mechanically tunable focusing metamirror in the visible

Cited by 30 publications

References 64 publications

Principles, Functions, and Applications of Optical Meta‐Lens

Principles, Functions, and Applications of Optical Meta‐Lens

Metamaterials – from fundamentals and MEMS tuning mechanisms to applications

Use of monocrystalline gold flakes for gap plasmon-based metasurfaces operating in the visible

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