Abstract: A harmonic light-generating metasurface includes a base substrate and a plurality of structures, that include nonlinear material, that are disposed in a pattern on a surface of the base substrate. Each structure of the plurality of structures individually supports a magnetic dipole mode. An electromagnetic field enhancement of the magnetic dipole mode induces generation of a harmonic signal by the plurality of structures. Alternatively, a harmonic light-generating metasurface, includes a base substrate, a supporting substrate that includes a nonlinear material, and a plurality of paired structures disposed in a pattern on a surface of the supporting substrate. Each paired structure, of the plurality of paired structures, collectively supports a toroidal dipole mode. An electromagnetic field enhancement of the toroidal dipole mode penetrates the supporting substrate to induce generation of a harmonic signal by the supporting substrate.

Abstract: A harmonic light-generating metasurface includes a base substrate and a plurality of structures, that include nonlinear material, that are disposed in a pattern on a surface of the base substrate. Each structure of the plurality of structures individually supports a magnetic dipole mode. An electromagnetic field enhancement of the magnetic dipole mode induces generation of a harmonic signal by the plurality of structures. Alternatively, a harmonic light-generating metasurface, includes a base substrate, a supporting substrate that includes a nonlinear material, and a plurality of paired structures disposed in a pattern on a surface of the supporting substrate. Each paired structure, of the plurality of paired structures, collectively supports a toroidal dipole mode. An electromagnetic field enhancement of the toroidal dipole mode penetrates the supporting substrate to induce generation of a harmonic signal by the supporting substrate.

Abstract: A plasmonic resonator can include: a substrate; a central resonator on the substrate; a first curved resonator disposed on the substrate and disposed at a first side of the central resonator; and a second curved resonator disposed on the substrate and disposed at a second side of the central resonator, the first curved resonator and the second curved resonator being asymmetric to each other with respect to the central resonator, and the central resonator and at least one of the first and second curved resonators being made of different materials.

Abstract: Apparatuses and methods for making configurable antennas are provided. An apparatus can include a phase change material (PCM) having a conductive phase and an insulating phase. The PCM can be activated to the conductive phase to produce an antenna structure. Different antenna shapes can be created by selectively inducing regions in the PCM to be conductive. Different antenna shapes can be produced having specific resonance frequencies and radiation patterns to suit the application. The PCM phase change can be induced using selective heat application.