Mechanical Chameleon through Dynamic Real-Time Plasmonic Tuning

Wang, Guoping; Chen, Xuechen; Liu, Sheng; Wong, Ching‐Ping; Chu, Sheng

doi:10.1021/acsnano.5b07472

Cited by 290 publications

(286 citation statements)

References 32 publications

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“…Because of the unique hydrogenation/dehydrogenation kinetics afforded by magnesium nanoparticles, this dynamic display has excellent reversibility and durability. Other approaches to dynamically control the colors include using electrochromic polymers [278] and bimetallic nanodots arrays [279].…”

Section: Dynamically Reconfigurable Color Printingmentioning

confidence: 99%

Gradient metasurfaces: a review of fundamentals and applications

2017

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In the wake of intense research on metamaterials the two-dimensional analogue, known as metasurfaces, has attracted progressively increasing attention in recent years due to the ease of fabrication and smaller insertion losses, while enabling an unprecedented control over spatial distributions of transmitted and reflected optical fields. Metasurfaces represent optically thin planar arrays of resonant subwavelength elements that can be arranged in a strictly or quasi periodic fashion, or even in an aperiodic manner, depending on targeted optical wavefronts to be molded with their help. This paper reviews a broad subclass of metasurfaces, viz. gradient metasurfaces, which are devised to exhibit spatially varying optical responses resulting in spatially varying amplitudes, phases and polarizations of scattered fields. Starting with introducing the concept of gradient metasurfaces, we present classification of different metasurfaces from the viewpoint of their responses, differentiating electricaldipole, geometric, reflective and Huygens' metasurfaces. The fundamental building blocks essential for the realization of metasurfaces are then discussed in order to elucidate the underlying physics of various physical realizations of both plasmonic and purely dielectric metasurfaces. We then overview the main applications of gradient metasurfaces, including waveplates, flat lenses, spiral phase plates, broadband absorbers, color printing, holograms, polarimeters and surface wave couplers. The review is terminated with a short section on recently developed nonlinear metasurfaces, followed by the outlook presenting our view on possible future developments and perspectives for future applications.

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Section: Dynamically Reconfigurable Color Printingmentioning

confidence: 99%

Gradient metasurfaces: a review of fundamentals and applications

2017

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“…The much smaller pixel pitch of 250 nm (compared with ∼15.5 μm in a liquid crystal pixel) renders a higher resolution. These features make this photon‐nanosieve hologram a fascinating platform for portable displays, although its reconfigurability may need to resort to other technologies .…”

Section: Resultsmentioning

confidence: 99%

Photon‐nanosieve for ultrabroadband and large‐angle‐of‐view holograms

Huang

Liu

et al. 2017

Laser & Photonics Reviews

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Holography is of great interest for both scientific research and industry applications, but it has always suffered from the strong dependence on wavelength and polarization of the incident light. Having revisited the Huygens–Fresnel principle, we propose a novel holography mechanism by elaborately choosing discrete point sources (PSs) and realize it experimentally by mimicking the radiated fields of these PSs through carefully designed photon‐nanosieves. Removing the modulation dispersion usually existing in traditional and metasurface holograms, our hologram empowers the simultaneous operation throughout the ultraviolet, entire visible and near‐infrared wavelength regions without polarization dependence. Due to the deep‐subwavelength dimension of nanosieves, this robust hologram offers a large angle‐of‐view of 40°×40° and possesses a lensing effect under a spherical‐wave illumination, which can work as a high‐resolution, lens‐less and distortion‐free microprojector that displays a 260× magnified image. It might open an avenue to a high‐tolerance holographic technique for electromagnetic and acoustic waves.

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“…As we will explain in later sections, our overall goal in this work is to create a fully camouflaged device that can truly blend-in to its surroundings. We believe this can be achieved via a variety of techniques, ranging from bimetallic nanodot arrays [48] to polarising beam-splitters [20].…”

Section: Chameleon Phone (Version 1)mentioning

confidence: 99%

“…To mimic this, a number of artificial materials have been developed for active camouflage that selectively reflect and absorb light of different wavelengths. For example, the bimetallic nano-dot arrays in [48] can be transparent or show different colours by using a camera to capture the background scene. Yu et al [52] combine light sensors and thermochromic dye to adapt backgrounds.…”

Section: New Materials and Technologies To Platform Invisibilitymentioning

confidence: 99%

Chameleon Devices

Pearson

Robinson

Jones

et al. 2017

Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems

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Figure 1. Chameleons are well known for their ability to change the colour of their skin for survival and social signalling [10]. Sometimes this colour change is to indicate aggression towards other animals, or in response to temperature or mood (left); at other times, as in the centre left image shown here, chameleons can match the pattern of their surroundings near perfectly, perhaps to lessen the danger from predators. In this work, we explore how mobile devices might be able to perform the same feat. The centre right image, then, shows a phone placed normally on a table. At right: the same phone blended in to its surroundings, but still able to present social signals to its owner in a subtle manner. ABSTRACTMany users value the ability to have quick and frequent sight of their mobiles when in public settings. However, in doing so, they expose themselves to potential risks, ranging from being targets of robbery to the more subtle social losses through being seen to be rude or inattentive to those around them. In nature, some animals can blend into their environments to avoid being eaten or to reduce their impact on the ecosystem around them. Taking inspiration from these evolved systems we investigate the notion of chameleon approaches for mobile interaction design. Our probes were motivated, inspired and refined through extended interactions with people drawn from contexts with differing ranges of security and privacy concerns. Through deployments on users' own devices, our prototypes show the value of the concept. The encouraging results motivate further research in materials and form factors that can provide more effective automatic plain-sight hiding.

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Mechanical Chameleon through Dynamic Real-Time Plasmonic Tuning

Cited by 290 publications

References 32 publications

Gradient metasurfaces: a review of fundamentals and applications

Gradient metasurfaces: a review of fundamentals and applications

Photon‐nanosieve for ultrabroadband and large‐angle‐of‐view holograms

Chameleon Devices

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