858 citations · 3.1k across the 26 of their papers we have counts for
26 papers
Breaking of Time Translation Symmetry and Ergodicity, and Entropy decrease in a Continuous Time Crystal Driven by Nonreciprocal Optical Forces
Tongjun Liu, Venugopal Raskatla, Jinxiang Li +2
Nonreciprocal nonequilibrium process are attracting growing interest in sociology, animal behaviour, chemistry, and nanotechnology, and may have played a role in the origin of life…
Continuous Space-Time Crystal State Driven by Nonreciprocal Optical Forces
Venugopal Raskatla, Tongjun Liu, Jinxiang Li +2
Continuous time crystals (CTCs) - media with broken continuous time translation symmetry - are an eagerly sought state of matter that spontaneously transition from a time-independe…
Photonic Metamaterial Analogue of a Continuous Time Crystal
Tongjun Liu, Jun-Yu Ou, Kevin F. MacDonald +1
Time crystals are an eagerly sought phase of matter with broken time-translation symmetry. Quantum time crystals with discretely broken time-translation symmetry have been demonstr…
Ballistic Dynamics of Flexural Thermal Movements in a Nano-membrane Revealed with Subatomic Resolution
Tongjun Liu, Jun-Yu Ou, Nikitas Papasimakis +3
Flexural oscillations of free-standing films, nano-membranes and nano-wires are attracting growing attention for their importance to the thermal, electrical and mechanical properti…
Picophotonics -- Subatomic Optical Localization Beyond Thermal Fluctuations
Tongjun Liu, Cheng-Hung Chi, Jun-Yu Ou +4
Despite recent tremendous progress in optical imaging and metrology, the resolution gap between atomic scale transmission electron microscopy and optical techniques has not been cl…
Optical Control of Nanomechanical Eigenfrequencies and Brownian Motion in Metamaterials
Jinxiang Li, Kevin F. MacDonald, Nikolay I. Zheludev
Nanomechanical photonic metamaterials provide a wealth of active switching, nonlinear and enhanced light-matter interaction functionalities by coupling optically and mechanically r…
Hyperspectral Nanomotion Microscopy
Tongjun Liu, Jun-Yu Ou, Kevin F. MacDonald +1
We have developed a technique that extends static scanning electron microscopic imaging to include hyperspectral mapping of fast thermal and externally-driven movements at up to Me…
All-dielectric free-electron-driven holographic light sources
Brendan P. Clarke, Behrad Gholipour, Kevin F. MacDonald +1
It has recently been shown that holographically nanostructured surfaces can be employed to control the wavefront of (predominantly plasmonic) optical-frequency light emission gener…
Smith-Purcell Radiation from Compound Blazed Gratings
Brendan P. Clarke, Jinkyu So, Kevin F. MacDonald +1
Free electrons travelling in vacuum carry evanescent electric field, which can only be coupled to free space light via interaction with a surrounding or nearby medium: as Cherenkov…
Fibre-optic metadevice for all-optical signal modulation based on coherent absorption
Angelos Xomalis, Iosif Demirtzioglou, Eric Plum +7
Recently, coherent control of the optical response of thin films of matter in standing waves has attracted considerable attention, ranging from applications in excitation-selective…
All-dielectric phase-change reconfigurable metasurface
Artemios Karvounis, Behrad Gholipour, Kevin F. MacDonald +1
We harness non-volatile, amorphous-crystalline transitions in the chalcogenide phase-change medium germanium antimony telluride (GST) to realize optically-switchable, all-dielectri…
Nano-optomechanical Nonlinear Dielectric Metamaterials
Artemios Karvounis, Jun-Yu Ou, Weiping Wu +2
By harnessing the resonant nature of localized electromagnetic modes in a nanostructured silicon membrane, an all-dielectric metamaterial can act as nonlinear medium at optical tel…
Controlling light with light using coherent meta-devices: all-optical transistor, summator and invertor
Xu Fang, Kevin F. MacDonald, Nikolay I. Zheludev
Although vast amounts of information are conveyed by photons in optical fibers, the majority of data processing is performed electronically, creating the infamous 'information bott…
Ultrafast all-optical switching via coherent modulation of metamaterial absorption
Xu Fang, Ming Lun Tseng, Jun-Yu Ou +3
We report on the demonstration of a femtosecond all-optical modulator providing, without nonlinearity and therefore at arbitrarily low intensity, ultrafast light-by-light control.…
Controlling light-with-light without nonlinearity
Jianfa Zhang, Kevin F. MacDonald, Nikolay I. Zheludev
According to Huygens' superposition principle, light beams traveling in a linear medium will pass though one another without mutual disturbance. Indeed, it is widely held that cont…
Metamaterial 'Gecko Toe': Optically-Controlled Adhesion to Any Surface
J. Zhang, K. F. MacDonald, N. I. Zheludev
On the mesoscopic scale, electromagnetic forces are of fundamental importance to an enormously diverse range of systems, from optical tweezers to the adhesion of gecko toes. Here w…
Controlling the Colour of Metals: Intaglio and Bas-Relief Metamaterials
Jianfa Zhang, Jun-Yu Ou, Nikitas Papasimakis +3
The fabrication of indented ('intaglio') or raised ('bas-relief') sub-wavelength metamaterial patterns on a metal surface provides a mechanism for changing and controlling the colo…
Phase-change chalcogenide glass metamaterial
Z. L. Samson, K. F. MacDonald, F. De Angelis +5
Combining metamaterials with functional media brings a new dimension to their performance. Here we demonstrate substantial resonance frequency tuning in a photonic metamaterial hyb…
The light-well: A tuneable free-electron light source on a chip
G. Adamo, Y. H. Fu, C-M. Wang +4
The passage of a free-electron beam through a nano-hole in a periodically layered metal/dielectric structure creates a new type of tuneable, nanoscale radiation source - a 'light-w…
Ultrafast active plasmonics: transmission and control of femtosecond plasmon signals
K. F. MacDonald, Z. L. Samson, M. I. Stockman +1
We report that femtosecond surface plasmon polariton pulses can propagate along a metal-dielectric waveguide and that they can be modulated on the femtosecond timescale by direct u…
Light-induced structural transformations in a single gallium nanoparticulate
B. F. Soares, K. F. MacDonald, V. A. Fedotov +1
In a single gallium nanoparticulate, self-assembled (from an atomic beam) in a nano-aperture at the tip of a tapered optical fiber, we have observed evidence for a sequence of reve…
High-contrast modulation of light with light by control of surface plasmon polariton wave coupling
A. V. Krasavin, A. V. Zayats, K. F. MacDonald +1
We have demonstrated a new mechanism for modulating light with light by controlling the efficiency with which light is coupled into a plasmon polariton wave. An optical fluence of…
Controlling the coexistence of structural phases and the optical properties of gallium nanoparticles with optical excitation
K. F. MacDonald, V. A. Fedotov, S. Pochon +3
We have observed reversible structural transformations, induced by optical excitation at 1.55 micrometer, between the beta, gamma and liquid phases of gallium in self-assembled gal…
Phase coexistence in Gallium nanoparticles controlled by electron excitation
S. Pochon, K. F. MacDonald, R. J. Knize +1
In Gallium nanoparticles of 100 nm in diameter grown on the tip of an optical fiber from an atomic beam we observed equilibrium coexistence of gamma, beta and liquid structural pha…