Coherent control of high efficiency metasurface beam deflectors with a back           partial reflector

Kita, Shota; Takata, Kenta; Ono, Masaaki; Nozaki, Kengo; Kuramochi, Eiichi; Takeda, Koji; Notomi, Masaya

doi:10.1063/1.4978662

Cited by 28 publications

(19 citation statements)

References 30 publications

(47 reference statements)

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“…(b) The counterpropagating coherent input signals form a standing wave and -depending on their phase difference -the metasurface can be located at a position of destructive interference of electric fields (node) where absorption is suppressed or a position of constructive interference (anti-node) where absorption is increased. In the ideal case, absorption can be controlled from 0% to 100%.[12, 13], redirection of light [14,15] as well as nonlinear [16], polarization [17] and quantum [18,19] effects in films of nanoscale thickness and excitation-selective spectroscopy [20]. In particular, it has been predicted that coherent interaction of light on lossy ultrathin films could perform signal processing functions [7] and proof-arXiv:1709.05357v1 [physics.optics]…”

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confidence: 99%

“…In the ideal case, absorption can be controlled from 0% to 100%. [12,13], redirection of light [14,15] as well as nonlinear [16], polarization [17] and quantum [18,19] effects in films of nanoscale thickness and excitation-selective spectroscopy [20]. In particular, it has been predicted that coherent interaction of light on lossy ultrathin films could perform signal processing functions [7] and proof-of-concept experiments in the static regime have been reported [21,22].…”

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confidence: 99%

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Fibre-optic metadevice for all-optical signal modulation based on coherent absorption

et al. 2018

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Recently, coherent control of the optical response of thin films in standing waves has attracted considerable attention, ranging from applications in excitation-selective spectroscopy and nonlinear optics to all-optical image processing. Here, we show that integration of metamaterial and optical fibre technologies allows the use of coherently controlled absorption in a fully fiberized and packaged switching metadevice. With this metadevice, which controls light with light in a nanoscale plasmonic metamaterial film on an optical fibre tip, we provide proof-of-principle demonstrations of logical functions XOR, NOT and AND that are performed within a coherent fibre network at wavelengths between 1530 and 1565 nm. The metadevice has been tested at up to 40 gigabits per second and sub-milliwatt power levels. Since coherent absorption can operate at the single-photon level and with 100 THz bandwidth, we argue that the demonstrated all-optical switch concept has potential applications in coherent and quantum information networks.

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Fibre-optic metadevice for all-optical signal modulation based on coherent absorption

et al. 2018

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“…Besides the discussed metasurfaces, numerous optical components have been replaced with the metasurfaces that have merits in compactness and performance. Representative examples are polarizer, diffuser, beam deflector, beam splitter, and color filter [33,34,[151][152][153][154][155][156][157][158][159][160][161][162][163]. Recently, with conventional bulk optical elements, it is tricky to output ultracompact devices, because the resultant device cannot help big sizes to have electronic, mechanic, and optical parts as a whole.…”

Section: Discussionmentioning

confidence: 99%

Progresses in the practical metasurface for holography and lens

Sung

Lee

2019

Nanophotonics

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Metasurfaces have received enormous attention thanks to their unique ability to modulate electromagnetic properties of light in various frequency regimes. Recently, exploiting its fabrication ease and modulation strength, unprecedented and unique controlling of light that surpasses conventional optical devices has been suggested and studied a lot. Here, in this paper, we discuss some parts of this trend including holography, imaging application, dispersion control, and multiplexing, mostly operating for optical frequency regime. Finally, we will outlook the future of the devices with recent applications of these metasurfaces.

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“…From a device perspective, this coherent control can be used to realize optical amplifiers and logical operators and may be extended to 2D operators (Figure g) and image processing . A few studies also demonstrated the potential of this method for beam steering . One numerical study showed that by applying this coherent control method to a metasurface with a phase gradient, the anomalously deflected beam could be modulated .…”

Section: Adaptive Metasurfacesmentioning

confidence: 99%

Optical Metasurfaces: Evolving from Passive to Adaptive

Hail

Michel

Poulikakos

et al. 2019

Advanced Optical Materials

115

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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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Coherent control of high efficiency metasurface beam deflectors with a back partial reflector

Cited by 28 publications

References 30 publications

Fibre-optic metadevice for all-optical signal modulation based on coherent absorption

Fibre-optic metadevice for all-optical signal modulation based on coherent absorption

Progresses in the practical metasurface for holography and lens

Optical Metasurfaces: Evolving from Passive to Adaptive

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