Electrically modulated varifocal metalens combined with twisted nematic liquid crystals

Fan, Chun-Yuan; Chuang, Tsung-Jung; Wu, Kuo-Hao; Su, Guo-Dung John

doi:10.1364/oe.386563

Cited by 43 publications

(28 citation statements)

References 39 publications

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“…Nevertheless, their functions remain static once they are fabricated. Therefore, many researchers are focusing on realizing active metalenses via introducing MEMS, 13 semiconductors, 14,15 phase-change materials, [16][17][18] graphene, 19 and liquid crystals (LCs) 20,21 with external field induced responsivity. The majority of them possess either switchable bifocal properties or a limited tuning range.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystal integrated metalens with tunable chromatic aberration

Shen

Zhou

et al. 2020

Adv. Photon.

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Overcoming chromatic aberrations is a vital concern in imaging systems in order to facilitate fullcolor and hyperspectral imaging. By contrast, large dispersion holds opportunities for spectroscopy and tomography. Combining both functions into a single component will significantly enhance its versatility. A strategy is proposed to delicately integrate two lenses with a static resonant phase and a switchable geometric phase separately. The former is a metasurface lens with a linear phase dispersion. The latter is composed of liquid crystals (LCs) with space-variant orientations with a phase profile that is frequency independent. By this means, a broadband achromatic focusing from 0.9 to 1.4 THz is revealed. When a saturated bias is applied on LCs, the geometric phase modulation vanishes, leaving only the resonant phase of the metalens. Correspondingly, the device changes from achromatic to dispersive. Furthermore, a metadeflector with tunable dispersion is demonstrated to verify the universality of the proposed method. Our work may pave a way toward active metaoptics, promoting various imaging applications.

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Section: Introductionmentioning

confidence: 99%

Liquid crystal integrated metalens with tunable chromatic aberration

Shen

Zhou

et al. 2020

Adv. Photon.

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“…Reproduced with permission. [ 135 ] Copyright 2020, Optical Society of America. d) Micro‐electro‐mechanical system (MEMS) scanner with top flat lens (optical microscope image) indicating the rotational axes, inset: device mounted on dual in‐line package ready for electrostatic actuation.…”

Section: Functionalitiesmentioning

confidence: 99%

Principles, Functions, and Applications of Optical Meta‐Lens

Chen

Feng

et al. 2021

Advanced Optical Materials

151

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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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“…The use of a liquid crystal (LC) layer on a metalens can enable instantaneous electrical control. In one such metalens, the position of the focal point varies depending on the polarization of the incident wave that can be modulated by an electrical stimulus on the LC layer (Fan et al, 2020a); this system includes a layer of twisted nematic LCs that convert the polarization direction of the incident light when the electrical state is on or off (Figure 3C).…”

Section: Reviewmentioning

confidence: 99%

“…Mechanical stimuli of an optical system can cause structural changes that affect the position, size, and shape of focal points. These stimuli include electrostatic actuating (Arbabi et al, 2018a) Reprinted with permission from (Fan et al, 2020a). Copyright 2020, The Optical Society.…”

Section: Reviewmentioning

confidence: 99%

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Recent Progress on Ultrathin Metalenses for Flat Optics

et al. 2020

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As technology advances, electrical devices such as smartphones have become more and more compact, leading to a demand for the continuous miniaturization of optical components. Metalenses, ultrathin flat optical elements composed of metasurfaces consisting of arrays of subwavelength optical antennas, provide a method of meeting those requirements. Moreover, metalenses have many other distinctive advantages including aberration correction, active tunability, and semi-transparency, compared to their conventional refractive and diffractive counterparts. Therefore, over the last decade, great effort has been focused on developing metalenses to investigate and broaden the capabilities of metalenses for integration into future applications. Here, we discuss recent progress on metalenses including their basic design principles and notable characteristics such as aberration correction, tunability, and multifunctionality.

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Electrically modulated varifocal metalens combined with twisted nematic liquid crystals

Cited by 43 publications

References 39 publications

Liquid crystal integrated metalens with tunable chromatic aberration

Liquid crystal integrated metalens with tunable chromatic aberration

Principles, Functions, and Applications of Optical Meta‐Lens

Recent Progress on Ultrathin Metalenses for Flat Optics

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