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Water-based metamaterials for advanced microwave control and sensing
No full textIn the talk I review different water-based devices for microwave control and sensing. Among the effective implementation of water-based elements there are examples of metasurfaces, absorbers, dielectric resonance antennas, radio-frequency components and structures with a so-called bound state in the continuum as a sensor
Shapeshifting diffractive optical elements
No full textWe have proved that it is possible to realize optical elements with theory-matching efficiency and practical use, reconfigurable on demand right where and when needed. I will present diffraction optical elements with efficiency equal to the theoretical efficiency, realized by direct structuring of the surface of a photosensitive polymer, avoiding any further development step
The challenge of EM simulation for the design of automotive radar frontends
No full textThis presentation analyses the trends for automotive radar systems, including high-definition imaging and new sensor architectures. The focus will be on RF performance and its impacts on the frontend design. Design bottlenecks like the interface between the MMIC and the radar board, electromagnetic interference or the effect of the casing and the fascia will be discussed
Non-linear THz studies at the TeraFERMI beamline
No full textThe THz fields are used to achieve THz control of matter and to push materials well into their nonlinear regime. THz nonlinearities are particularly pronounced in Dirac materials, because of their non-conventional band-structure properties. We report here on the THz nonlinear electrodynamics of the topological insulator Bi2Se3 and on layered black phosphorus, thus highlighting the role of band dispersion in shaping the nonlinear properties
ENSEMBLE3 - Novel materials for photonics - possibilities provided by crystal growth
No full textPossibilities of producing novel photonic materials provided by the crystal growth will be discussed including examples of materials exhibiting various interesting optical and electromagnetic properties
Casimir interaction on gratings
No full textWe will discuss some recent numerical results on the Casimir interaction between metallic gratings. These findings pave the way to the design of a contactless quantum vacuum torsional spring, and sensors with possi- ble relevance to micro and nanomechanical devices
Effective Scattering Control of Graphene Micro-disks Utilizing the Fundamental Plasmon Resonances
No full textThe plane wave scattering on graphene micro-disks is investigated numerically in the present work. Initially, the propagation properties of the supported surface waves on the 2D material are studied theoretically. Then, the plasmonic resonant frequencies of a circular graphene scatterer are identified via the broadband analysis of the absorption cross-section. Finally, the radar cross-section of the same setup is examined, indicating that the resonant frequencies are optimal for forward propagation, thus enabling the effective beam manipulation
Plasmonic Heterodyne Terahertz Receivers with Quantum-Level ,Sensitivity at Room Temperature
No full textWe introduce a terahertz receiver that uses plasmonic photomixing for frequency downconversion to offer quantum-level sensitivities at room temperature for the first time. Frequency downconversion is achieved by mixing terahertz radiation and a heterodyning optical beam with a terahertz beat frequency in a plasmonics-enhanced semiconductor active region. With a versatile design capable of broadband spectrometry, over a 0.1-5 THz bandwidth, we demonstrate receiver sensitivities down to 3 times the quantum-limit at room temperature
Topological Properties of Evanescent Fields
No full textThe spin-orbit coupling in evanescent waves results in complex topological field structures analogous to prototypical condensed matter phenomena, such as quantum spin-Hall effect, skyrmions, merons, and others. In this talk, we will overview spin-orbit coupling effects in optical fields in waveguides and metamaterials, their topological manifestations and applications
Optomechanics of ultra thin photonic metasurfaces
No full textWe show how the ability of metasurfaces to steer and bend light can be harnessed to shape optomechanical forces. We discuss the potential of metasurfaces as ideal platforms for optomechanics because of their large-area and lightweight form. Such metasurface control of optical forces could lead to novel approaches to optical levitation and propulsion at the macro scale.Â