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Building Uncooled Infrared Camera based on One Atom Thick Graphene
No full textOne atom thick graphene offers an alternative mechanism bypassing material bandgap restriction. Further, the ability of carrier concentration modulation on graphene via external voltage offers dynamic spectral selectivity for color night vision/sensing.Â
Exact, Feasible and Practical Cloaks for Static and Quasistatic Magnetic Fields
No full textHere we review how cloaks for dc and low-ac magnetic fields have been theoretically proposed and experimentally demonstrated using different approaches. They range from exact cloaks for uniform dc fields to actual cloaks being used in future particle accelerators. We also present how the cloak of static and quasistatic magnetic fields by metamaterials can be realized in very simplified situations, including the case of using only a single homogeneous and isotropic material
Forward and Inverse Design of Electromagnetic Metasurfaces
No full textThe demonstration of exotic electromagnetic metasurfaces has benefited from the advance of computational electromagnetic simulations and the continued maturation of nanolithography. Recently, deep learning has shown a unmatched ability for the forward and inverse design of electromagnetic metasurfaces. I will overview this exciting and rapidly expanding area of research, highlighting novel examples and provide an outlook
Fundamental limits to electromagnetic response across geometric, frequency, and configuration degrees of freedom
No full textElectromagnetic design problem are generically hard nonlinear problems that are computationally expensive and prone to getting trapped at low-quality optima. We reformulate electromagnetic-design problems as quadratically constrained quadratic programs (QCQPs). In this formulation, Maxwell’s equations are replaced with a set of real- and reactive-power conservation laws, which enable identification of fundamental bounds across geometric, frequency, and configuration degrees of freedom. We show examples of fundamental limits for perfect absorbers, multi-frequency reflectivity sensors, and near-field radiative heat transfer
Strong Light-Matter interaction in nanohybrid architectures
No full textThe fabrication of hybrid systems composed by optical nanocavities and quantum dots represents a key approach to induce new,and distinctive physico-chemical properties, with significant implications in fields ranging from cavity quantum electrodynamics,to polariton chemistry. Here, strong coupling between surface plasmon polaritons and nanocrystal quasiparticles such as,excitons and phonons has been investigated through steady-state and time resolved spectroscopies, thus confirming,the possibility of altering the intrinsic nanomaterial response by means of properly tailored optical nanoresonators
Novel Sensing Technique for Non-destructive Composites Monitoring
No full textWe observed evolution of the transmission and reflection parameters of the composites containing magnetic microwire inclusions during the composites matrix polymerization. A remarkable change of the reflection and transmission in the range of 4-7 GHz upon the matrix polymerization is observed. Obtained results are considered as a base for novel sensing technique allowing non-destructive and non-contact monitoring of the composites utilizing ferromagnetic glass-coated microwire inclusions with magnetic properties sensitive to tensile stress and temperature
Critical distances for near-ground propagation: application to dipole antennas
No full textThis paper deals with the problem of near-ground wave propagation, in particular with the assessment of the region in which the near-ground wave becomes the dominant component. The critical distances are estimated as a function of the link parameters in the case of half-wave dipole antennas
Near-field spectroscopy of a phonon polariton infrared metasurface
No full textSurface Phonon Polaritons (SPhPs) can be excited in the Reststrahlen band of polar dielectrics where the dielectric function is negative. Antennas supporting SPhPs are an alternative to plasmonic resonators in the infrared, due to their reduced losses and higher field confinement. We investigate the near-field response of arrays of Silicon Carbide antennas by means of scattering scanning near field microscopy. Knowledge of the near-field response is needed for many applications requiring coupling of the antennas to other elements
Scalable quantum dot single-photon sources
No full textDeterministic sources of single photons are key elements for quantum information processing, simulation, and computing. I will present a photonic integrated circuit based on dual-mode waveguides for the resonant excitation of two self-assembled InAs quantum dots, paving the way to the integration of multiple sources on a chip. Our plug-and-play waveguide-based source can generate streams of pure and indistinguishable single photons on-demand, so that a planar platform for quantum photonic integrated circuits can be realized
Manipulating Circularly Polarized Optical Radiation with Functional Metasurfaces
No full textMetasurfaces have the potential to emerge as essential components for classical and nonclassical optical fields. In this talk, I will first present two examples on how to use metasurfaces to design quarter-wave plates that can not only allow broadband circular-to-linear polarization conversion but also generate vector vortex beams or function as a versatile beam splitter. After that, I will talk about a conceptually new approach to the room-temperature generation of circularly polarized, well-collimated single photons