A Lithography‐Free and Field‐Programmable Photonic Metacanvas

Dong, Kaichen; Hong, Sukjoon; Deng, Yang; Ma, He; Li, Jiachen; Wang, Xi; Yeo, Junyeob; Wang, Letian; Lou, Shuai; Tom, Kyle B.; Li, Kai; You, Zheng; Yang, Wei; Grigoropoulos, Costas P.; Yao, Jie; Wu, Junqiao

doi:10.1002/adma.201703878

Cited by 83 publications

(85 citation statements)

References 50 publications

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“…Reflection modulation over a range of 10–43% was also shown with an SRR surface in the near‐IR spectral range by employing GST‐225 . In other studies, optical scatterers at near‐ to mid‐IR wavelengths were directly generated in a continuous GST layer by locally inducing the phase transition in the layer by means of laser pulses …”

Section: Adaptive Metasurfacesmentioning

confidence: 80%

Optical Metasurfaces: Evolving from Passive to Adaptive

Hail

Michel

Poulikakos

et al. 2019

Advanced Optical Materials

109

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of ultrathin, artificial surfaces, so-called metasurfaces, for manipulating the propagation of light at will. [1,2] Metasurfaces control the propagation of light by abruptly changing its phase, amplitude, polarization, or spectrum at a surface and within a thin (quasi-2D) layer using large arrays of optical scatterers with subwavelength separation. Ideally, each scatterer can be independently engineered in order to locally influence the wavelets of the impinging light, and therefore, arbitrarily reform the wavefront. This concept has been exploited to create a variety of flat optical elements such as beam deflectors, [3][4][5] lenses, [6][7][8] and holograms. [9,10] As compared to bulky refraction-based optical elements, these surfaces are of subwavelength or wavelength-scale thickness, which enables their integration into compact devices. A main feature of the majority of such flat optical elements is that they are passive, and once fabricated, their optical functionalities are invariable. A beam deflector of this kind will direct light of a certain wavelength and direction always into the same direction, or a lens will focus light always to the same focal point. A broad range of new applications could be enabled if it were possible to actively and reversibly change the functionality of metasurfaces after their fabrication. With such "adaptive" metasurfaces beam deflectors with adjustable angle of deflection, metalenses with variable focal length or dynamic holograms may be realized. Advances toward such active devices are highly relevant for applications such as light detection and ranging [11] (LIDAR) sensing for driverless cars, dynamic zoom lenses for miniaturized camera systems [12] (e.g., in smartphones), or holographic displays for augmented reality devices. [13] An adaptive metasurface allows for the dynamic adjustment of an optical functionality of the surface. As shown in Figure 1, for the specific case of a metalens, these surfaces can be categorized based on their degree of dynamic adaptivity. While a passive surface has a fixed functionality, a switchable metasurface allows for switching back and forth between two (or more) predefined states (e.g., switching between different focal lengths, deflection angles, or hologram images). A continuously tunable metasurface enables continuous adjustment of a property within a range (e.g., tunable focal length or deflection angle). Finally, a freely tunable metasurface allows for continuous, arbitrary adjustment of a property, for example, 3D adjustment of the focal point of the metalens shown in Figure 1. Adaptive functionalities can be added to metasurfaces with different methods, for example, by mechanically rearranging the scatterers on the surface with respect to each other, or modifying

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Section: Adaptive Metasurfacesmentioning

confidence: 80%

Optical Metasurfaces: Evolving from Passive to Adaptive

Hail

Michel

Poulikakos

et al. 2019

Advanced Optical Materials

109

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“…The sensor not only accurately tests the simple human movement, but also measures some physiological activities of the human body . The obtained data is of great significance in human health monitoring . Sensors can monitor the knee jerk when it is attached to the knee.…”

Section: Resultsmentioning

confidence: 99%

An Ultra‐sensitive, Rapidly Responsive Strain Sensor Based on Silver Microflakes by Simple Process

Yan

Saleem

et al. 2019

ChemistrySelect

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Flexible sensors with excellent sensitivity and stable performance are attracting more and more attention in emerging electronics. Herein, silver microflakes (AgMFs) as conductive filler in polyaniline (PANI)/polyurethane (PU) matrix are used to prepare the AgMFs/PANI/PU strain sensor by simple mixing and curing process. The AgMFs/PANI/PU strain sensor has high sensitivity (GF = 173.66), ultra-short response time (10 ms), and reassuring cycle stability (> 4000 times). Excellent sensor performance demonstrates its unlimited potential for health monitoring, such as joint motion, breathing and pulse beat.

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“…Actively optical controls based on high‐performance metamaterials is of vital importance for next‐generation functional nanophotonic devices as well as all‐optical integrated circuits, such as the switches, modulators, and data‐storage devices . The ultrafast MIT response makes VO 2 promising in these fields.…”

Section: Optical Stimulated Devicesmentioning

confidence: 99%

Vanadium Dioxide: The Multistimuli Responsive Material and Its Applications

Wang

Liu

et al. 2018

Small

183

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The reversible, ultrafast, and multistimuli responsive phase transition of vanadium dioxide (VO ) makes it an intriguing "smart" material. Its crystallographic transition from the monoclinic to tetragonal phases can be triggered by diverse stimuli including optical, thermal, electrical, electrochemical, mechanical, or magnetic perturbations. Consequently, the development of high-performance smart devices based on VO grows rapidly. This review systematically summarizes VO -based emerging technologies by classifying different stimuli (inputs) with their corresponding responses (outputs) including consideration of the mechanisms at play. The potential applications of such devices are vast and include switches, memories, photodetectors, actuators, smart windows, camouflages, passive radiators, resonators, sensors, field effect transistors, magnetic refrigeration, and oscillators. Finally, the challenges of integrating VO into smart devices are discussed and future developments in this area are considered.

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A Lithography‐Free and Field‐Programmable Photonic Metacanvas

Cited by 83 publications

References 50 publications

Optical Metasurfaces: Evolving from Passive to Adaptive

Optical Metasurfaces: Evolving from Passive to Adaptive

An Ultra‐sensitive, Rapidly Responsive Strain Sensor Based on Silver Microflakes by Simple Process

Vanadium Dioxide: The Multistimuli Responsive Material and Its Applications

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