Angle-sensitive dynamic optical modulation based on Huygens metasurfaces

Wu, Jun; Tang, Feng; Ma, Jun; Li, Qingzhi; Shang, Sihui; Wu, Yiman; Wang, Yiqun; Ye, Xin; Zheng, Wanguo; Zhu, Rihong

doi:10.1016/j.rinp.2020.103226

Cited by 8 publications

(2 citation statements)

References 27 publications

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“…Optical metasurfaces, 2D artificial metamaterials with thicknesses smaller than the working wavelength, have attracted much attention due to many peculiar properties that do not exist in nature [7][8][9][10][11]. They are made of two-dimensional arrays of subwavelength nanostructures and can locally control the amplitude [12][13][14][15], phase [15][16][17][18], polarization [19,20], and non-linear effect [21][22][23] of light. In particular, the all-dielectric metasurfaces have the advantages of low-loss, thermal stability, magnetic effect, etc., [8,10], which is a promising candidate for the miniaturization and integration of complex intense-light systems [24,25].…”

Section: Introductionmentioning

confidence: 99%

Meta-Deflectors Made of Dielectric Nanohole Arrays with Anti-Damage Potential

Tang

et al. 2021

Photonics

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In intense-light systems, the traditional discrete optical components lead to high complexity and high cost. Metasurfaces, which have received increasing attention due to the ability to locally manipulate the amplitude, phase, and polarization of light, are promising for addressing this issue. In the study, a metasurface-based reflective deflector is investigated which is composed of silicon nanohole arrays that confine the strongest electric field in the air zone. Subsequently, the in-air electric field does not interact with the silicon material directly, attenuating the optothermal effect that causes laser damage. The highest reflectance of nanoholes can be above 99% while the strongest electric fields are tuned into the air zone. One presentative deflector is designed based on these nanoholes with in-air-hole field confinement and anti-damage potential. The 1st order of the meta-deflector has the highest reflectance of 55.74%, and the reflectance sum of all the orders of the meta-deflector is 92.38%. The optothermal simulations show that the meta-deflector can theoretically handle a maximum laser density of 0.24 W/µm2. The study provides an approach to improving the anti-damage property of the reflective phase-control metasurfaces for intense-light systems, which can be exploited in many applications, such as laser scalpels, laser cutting devices, etc.

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Section: Introductionmentioning

confidence: 99%

Meta-Deflectors Made of Dielectric Nanohole Arrays with Anti-Damage Potential

Tang

et al. 2021

Photonics

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“…Nanocylinder is polarization independent due to its structural symmetry. [22] In this study, the three-dimensional (3D) finite-difference time-domain method is used for optical simulations, and the discontinuous Galerkin time-domain method is used for thermal simulations. In optical simulations, the incident optical source is set to be a plane wave.…”

Section: Introductionmentioning

confidence: 99%

Temperature-responded tunable metalenses based on phase transition materials

Wu¹,

Tang²,

Ma³

et al. 2022

Chinese Phys. B

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Once the metalenses are fabricated, the functions of most are invariable. The tunability and reconfigurability are useful and cost-saving for metalenses in realistic applications. We demonstrated this tunability here via a novel hybrid metalens with the strategic placement of an ultra-thin VO2 layer. The hybrid metalens is capable of dynamically modulating the focusing intensity of transmitted light at 1550 nm, and demonstrated a 42.28% focusing efficiency of the incident light and 70.01% modulation efficiency. The hybrid metalens’ optothermal simulations show the optothermal conversion progress of dynamic focusing, and the maximum laser density of 1.76×103 W/cm2 can be handled at an ambient temperature lower than 330 K. The hybrid metalens proposed in this work, a light-dose sensitive tunable smart metalens that can protect other instruments/systems or materials from damage, has its specific applications such as anti-satellite blinding, bio-imaging, etc.

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