Electrically tunable transmission of gold binary-grating metasurfaces integrated with liquid crystals

Chen, Kuo‐Ping; Ye, Shi Cheng; Yang, Chi Yin; Yang, Zu‐Po; Lee, Wei; Sun, Mingzi

doi:10.1364/oe.24.016815

Cited by 26 publications

(19 citation statements)

References 32 publications

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“…The duty cycle s of the inclusions is kept constant, hereafter, at s 1∕2. Thus, the metasurface has the form of a classical binary grating [36]; fabricating a binary grating is easier than other types of gratings like multilevel or graded-index ones [37]. Changing the duty cycle, the number of inclusions per unit cell or even their shape might also be worthy of further investigation; the latter characteristics have been shown to play significant roles in the scattering behaviors of such structures (see, e.g., [24] and [38] in the context of sharp resonances exploited in frequency selective filters).…”

Section: A Parameter Selectionmentioning

confidence: 99%

Anomalous reflection of visible light by all-dielectric gradient metasurfaces

Tsitsas

Valagiannopoulos

2017

J. Opt. Soc. Am. B

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Plane wave scattering by a planar metasurface composed of two periodically alternating rectangular dielectric rods is considered. A rigorous integral equation methodology is employed for the analysis and the accurate determination of the reflected and transmitted fields. Systematic optimizations with respect to the configuration's parameters are performed, which reveal that it is possible to obtain significantly enhanced anomalous reflection (with simultaneously suppressed ordinary reflection predicted by Snell's law) with power varying from 92% to almost 100% of the input one, depending on the color of the incident light. It is shown that these reflection properties are supported by metasurfaces easily realizable with specific low-loss dielectric materials. In this way, several all-dielectric optimal designs are reported that can be used in numerous applications demanding anomalous reflection in the visible range.

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Section: A Parameter Selectionmentioning

confidence: 99%

Anomalous reflection of visible light by all-dielectric gradient metasurfaces

Tsitsas

Valagiannopoulos

2017

J. Opt. Soc. Am. B

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“…The phase of an LC depends on several factors, including the chemical composition of its constituent molecules, its temperature, and critically, the local electrical/magnetic conditions. While some designs explicitly rely on changes in the temperature of the unit cell for tuning, most induce changes on the liquid crystal electrically by applying voltage or by irradiation, often UV . LC molecules will in general align with an impressed electric field, which allows for the material phase to be modified using an appropriately oriented external voltage or by illumination at a specific frequency and polarization.…”

Section: Liquid Crystals (Lcs)mentioning

confidence: 99%

“…LCs may also be used in the tuning of grating metasurfaces. Chen et al used electrically controlled LCs to modify the diffraction efficiency of a binary‐grating and Yan et al used a polymer stabilized blue‐phase LC to tune a phase grating . A dye‐doped LC cell was also used for creating an optically erasable fishnet structure by illuminating it with two orthogonal interference fields for potential use as a controllable photonic crystal .…”

Section: Liquid Crystals (Lcs)mentioning

confidence: 99%

Recent Progress in Active Optical Metasurfaces

Kang

Jenkins

Werner

2019

Advanced Optical Materials

153

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Evolving from metamaterials, optical metasurfaces not only inherit their unprecedented flexibility in tailoring light–matter interaction but also the generally fixed response determined by the metaatoms' geometries—an undesirable property that hinders the development of practical metadevices. Consequently, novel optical metasurfaces that can be tuned in an active manner are intensively studied in recent years. Due to their optically thin structures, optical metasurfaces present unique characteristics in the realization of dynamic tuning. In this review, a detailed summary of the recent advances in active optical metasurfaces is provided including discussions reviewing a variety of active materials and approaches that enable faster, stronger, and more accurate tuning. Beyond facilitating practical metadevices, studies of active metasurfaces have, and will continue to deepen the understandings of the interaction between light and nanostructured photonic architectures and to promote the development of nanofabrication techniques involving high‐complexity.

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“…Thus, the metasurface has the form of a binary grating (i.e. characterized by 50% duty cycle); binary gratings are easier to fabricate than other types of gratings like multilevel or graded-index ones [5]. The metasurface is placed in vacuum with refractive index n 0 = 1.…”

Section: Integral Equation Analysismentioning

confidence: 99%

Mitigating Snell's-Law reflection and transmission with metasurfaces of ordinary dielectrics

Tsitsas

Valagiannopoulos

2017

2017 International Conference on Electromagnetics in Advanced Applications (ICEAA)

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-Obtaining anomalous reflection and transmission (namely propagation along directions different from those predicted by Snell's law) is investigated for plane waves impinging on a planar periodic metasurface composed of two dielectric layers. The associated boundary-value problem is treated by a rigorous entire-domain integral equation methodology. Optimizations with respect to the configuration's parameters are performed which reveal that it is possible to obtain significantly enhanced anomalous transmission and reflection depending on the color of the incident light. The optimal parameter values correspond to metasurfaces which can be easily realizable by low-loss dielectric materials.

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Electrically tunable transmission of gold binary-grating metasurfaces integrated with liquid crystals

Cited by 26 publications

References 32 publications

Anomalous reflection of visible light by all-dielectric gradient metasurfaces

Anomalous reflection of visible light by all-dielectric gradient metasurfaces

Recent Progress in Active Optical Metasurfaces

Mitigating Snell's-Law reflection and transmission with metasurfaces of ordinary dielectrics

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