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In the past few years, a new phenomenon of absorption, called “coherent perfect absorption (CPA)”, has attracted significant attentions [1, 2]. CPA relies on the coherent interference of light. In a typical CPA system, two coherent beams are incident on the absorber from opposite sides and the reflected light of one beam interfere with the transmitted light of the other and vice versa. CPA was first...
Highly doped graphene has been demonstrated to be a promising plasmonic material where the excitation of surface plasmons can significantly enhance the interaction with light [1, 2]. Here we investigate the coupling effects in graphene nanodisk oligomers (heptamer) [2] and try to employ one of the interesting phenomena from the coupling, the so called Fano-resonances, for sensing applications [3]...
Graphene appears to be a good candidate in designing tunable devices operating in THz spectral ranges owing to its tunability of conductivity. It can be tuned dynamically via electrostatic doping [1, 2]. Here we propose a tunable terahertz half wave plate based on the hybridization effect caused by coupling interactions between plasmonic resonances in the two coupled graphene nanodisks (CGN). We show...
We demonstrate metamaterial with a cubic optical nonlinearity that is ten orders of magnitude greater than the reference nonlinearity of CS2. The nonlinearity has optomechanical nature and is underpinned by light-induced electromagnetic near-field interactions.
Magnetic resonances can be achieved at visible and near-infrared frequencies in purely dielectric metamaterials via the coupling between pairs of closely spaced, dissimilar dielectric rods. We demonstrate this new phenomenon experimentally and explore how such structures may present giant nonlinear optical, bistable and asymmetric transmission responses driven by resonant optomechanical forces at...
We show experimentally that bistable, optically-induced phase switching in germanium antimony telluride (GST) — a member of the Te-based chalcogenide alloy family upon which all of today's re-writable optical disc and phase-change RAM technologies are based — provides a platform for the engineering of non-volatile metamaterial transmission/reflection modulators (Fig. 1) for near- to mid-infrared wavelengths...
For more than ten years now, significant effort has been focused on the engineering of metamaterials to achieve artificial optical magnetism, most notably for applications in negative refractive media. However, the challenges associated with the fact that the metals conventionally employed as the foundation of photonic metamaterials suffer from high inherent energy dissipation due to resistive losses...
Optical forces are extremely important in mesoscopic systems: they are increasingly exploited in various forms of optical tweezing, manipulation and binding, as well as for actuation of nanophotonic devices [1]. Here we introduce optomechanical dielectric metamaterials - a new paradigm for achieving strongly nonlinear, asymmetric and bistable optical properties via the mutual interaction of optical...
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