Ordered capillary-wave states: Quasicrystals, hexagons, and radial waves

Christiansen, Bo; m, Preben Alstro; Levinsen, Mogens T.

doi:10.1103/physrevlett.68.2157

Cited by 184 publications

(109 citation statements)

References 8 publications

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“…In interaction with the stimulation frequency, the latency differences of the different cone types (Schnapf et al, 1990) and/or the latency differences between the two color coding channels (L/M and S/(L + M)) shown by Cottaris and De Valois (1998) may possibly explain for the subjective color experiences. The most astonishing characteristic of the subjective forms investigated here is their similarity to resonant systems, such as vibrating surfaces of water or sand (e.g., Christiansen, Alstrom, & Levinsen, 1992). As it happens, this similarity may be more than just analogy: the lateral retinal connections provided by horizontal and bipolar cells have specific transfer latencies.…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

Flicker-induced color and form: Interdependencies and relation to stimulation frequency and phase

Becker

Elliott

2006

Consciousness and Cognition

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Publication InformationBecker, C., & Elliott, M. A. (2006 AbstractOur understanding of human visual perception generally rests on the assumption that conscious visual states represent the interaction of spatial structures in the environment and our nervous system. This assumption is questioned by circumstances where conscious visual states can be triggered by external stimulation which is not primarily spatially defined. Here, subjective colors and forms are evoked by flickering light while the precise nature of those experiences varies over flicker frequency and phase. WhatÕs more, the occurrence of one subjective experience appears to be associated with the occurrence of others. While these data indicate that conscious visual experience may be evoked directly by particular variations in the flow of spatially unstructured light over time, it must be assumed that the systems responsible are essentially temporal in character and capable of representing a variety of visual forms and colors, coded in different frequencies or at different phases of the same processing rhythm.

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Section: Discussion Of Experimentsmentioning

confidence: 99%

Flicker-induced color and form: Interdependencies and relation to stimulation frequency and phase

Becker

Elliott

2006

Consciousness and Cognition

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“…In the more immediate future these concepts will lead to, for example, the construction of a variety of reconfigurable quasicrystalline structures (22,23) which would be difficult by selfassembly techniques. Indeed, the range of structures that can be constructed is limited only by the ability to produce the appropriate acoustic energy landscape.…”

Section: Discussionmentioning

confidence: 99%

Acoustically trapped colloidal crystals that are reconfigurable in real time

Caleap

Drinkwater²

2014

Proc. Natl. Acad. Sci. U.S.A.

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Photonic and phononic crystals are metamaterials with repeating unit cells that result in internal resonances leading to a range of wave guiding and filtering properties and are opening up new applications such as hyperlenses and superabsorbers. Here we show the first, to our knowledge, 3D colloidal phononic crystal that is reconfigurable in real time and demonstrate its ability to rapidly alter its frequency filtering characteristics. Our reconfigurable material is assembled from microspheres in aqueous solution, trapped with acoustic radiation forces. The acoustic radiation force is governed by an energy landscape, determined by an applied high-amplitude acoustic standing wave field, in which particles move swiftly to energy minima. This creates a colloidal crystal of several milliliters in volume with spheres arranged in an orthorhombic lattice in which the acoustic wavelength is used to control the lattice spacing. Transmission acoustic spectroscopy shows that the new colloidal crystal behaves as a phononic metamaterial and exhibits clear band-pass and band-stop frequencies which are adjusted in real time.reconfigurable acoustic assembly | acoustic metamaterials | aqueous suspension of microspheres A rtificially engineered metamaterials have attracted significant research interest due to their useful wave guiding and transmission properties. The interest in these materials stems from the possibility of gaining previously unheralded control over wave phenomena, for example, controlling the path of waves leads to incredibly efficient lenses (1) or invisibility cloaking (2, 3) and controlling their transmission and reflection leads to highly efficient filters (4), diodes (5-7), or superabsorbers (8).Photonic and phononic crystals are periodic metamaterials typically created from multiple elementary repeating cells. They exhibit a well-known series of band-pass and band-stop frequencies that have attracted significant attention for use as filters and absorbers. Here we demonstrate a phononic crystal reconfigurable in real time, although the same principles could be used to fabricate other metamaterials including photonic crystals, as well as the more elaborate configurations required for applications such as cloaking.The frequencies of the band gaps in phononic crystals can be tuned by changing the lattice geometry (9), and the width of the gaps depends on the contrast between the densities and sound velocities of the component materials. Most of the work to date has not involved any reconfigurability, for example, 2D phononic crystals with a periodicity millimeter order and above have been assembled manually and used to explore their basic properties (10, 11). A reconfigurable phononic crystal has been created in 2D using optical tweezers but this is limited to a relatively small scale (' 1 × 10 8 -m 2 area) and to transparent or dielectric particles (12). Three-dimensional experimental realizations of phononic crystals have either been manufactured with millimeter periodicity or as colloids (13,14). Colloids r...

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“…When the amplitude of the excitation exceeds a critical value, standing wave patterns are formed on the surface which oscillate at half the frequency of the drive [3]. For large enough containers, the surface pattern becomes approximately independent of the boundaries, and line, square, hexagonal, triangular, and 8-fold quasiperiodic patterns have been observed [4][5][6]. However, despite this profusion of observed patterns a cohesive picture has not emerged.…”

Section: Nonlinear Pattern Formation Of Faraday Wavesmentioning

confidence: 99%