A diamond whispering gallery mode resonator. In some embodiments, a system includes: a first whispering gallery mode resonator and a first waveguide. The first whispering gallery mode resonator may be composed of diamond. The first whispering gallery mode resonator may be coupled to the first waveguide, and the first whispering gallery mode resonator may be configured to support a first resonant mode having a frequency greater than 110 gigahertz.

A diamond whispering gallery mode resonator. In some embodiments, a system includes: a first whispering gallery mode resonator and a first waveguide. The first whispering gallery mode resonator may be composed of diamond. The first whispering gallery mode resonator may be coupled to the first waveguide, and the first whispering gallery mode resonator may be configured to support a first resonant mode having a frequency greater than 110 gigahertz.

3D microscale metamaterial structures and methods of making. The metamaterial structure includes a polygonal structure having a plurality of panels connected to one another at structure corners. A metal resonator pattern is provided on each of the panels. The resonator patterns of neighboring panels are electromagnetically coupled to one another across a gap between the resonator patterns at the corresponding structure corner. The panels can be a polymer material, layers of graphene oxide, etc. The metamaterial structure can be a 3D octagram split-ring resonator, and is completely isotropic. The 3D metamaterial structure can be made by a self-folding process.

3D microscale metamaterial structures and methods of making. The metamaterial structure includes a polygonal structure having a plurality of panels connected to one another at structure corners. A metal resonator pattern is provided on each of the panels. The resonator patterns of neighboring panels are electromagnetically coupled to one another across a gap between the resonator patterns at the corresponding structure corner. The panels can be a polymer material, layers of graphene oxide, etc. The metamaterial structure can be a 3D octagram split-ring resonator, and is completely isotropic. The 3D metamaterial structure can be made by a self-folding process.

An RF choke resonator assembly has a cylindrical magnetic field shielding case with openings at two ends thereof, a magnetic field shielding plate and a winding skeleton, and a capacitive plate inside the case. The magnetic field shielding plate closes the opening at one end of the case, and has a through-hole allowing a cable to pass there through. The cable is wound on the winding skeleton. The capacitive plate is disposed opposite the magnetic field shielding plate in the case, separated therefrom by the winding skeleton, and is electrically connected to the case in a closed manner. The capacitive plate has a through-hole allowing the cable to pass there through. The capacitive plate is remote from the other opening case end opposite the opening closed by the magnetic field shielding plate. An insulation space is formed at that other opening, having a length in the axial direction greater than or equal to one quarter of the length of the magnetic field shielding case in the axial direction.

An optical device includes a nanostructured transparent dielectric film, which is a Huygens metasurface. The Huygens metasurface imparts a phase change to light propagating through or reflecting from the surface. The phase change can be achieved by means of a resonant interaction between light and the Huygens resonators, resulting in a controllable phase change of 0 to 2 with approximately 100% light transmission characterized by a below 0.1 dielectric loss tangent of delta and with the height of the resonators less than the wavelength of light. In one embodiment, the metasurface includes titanium dioxide, but many materials or stacks of different materials may be used. The optical device is functional throughout the visible spectrum between 380 and 700 nm. The nanostructured transparent dielectric film includes a plurality of Huygens resonators. The phase and the amplitude of the nanostructured transparent dielectric film are modulated by arranging the plurality of Huygens resonators such that certain properties, including the radius and height of each Huygens resonator, as well as the gap between two adjacent Huygens resonators, are controlled to optimize the performance of the optical device within the visible spectrum.

An ultra-wideband electromagnetic band gap (EBG) structure includes multiple EBG units in an array. Each EBG unit includes a power plane, a dielectric substrate and a ground plane from top to bottom. The power plane includes a patch, a coupled complementary split ring resonator (C-CSRR) and a plurality of semi-improved Z-bridge structures. Each edge of the patch is provided with a semi-improved Z-bridge structure. The C-CSRR is provided within a ring formed by the semi-improved Z-bridge structures. The Z-bridge structure includes a first horizontal branch, a first vertical branch, a second horizontal branch and a second vertical branch connected in sequence. The second vertical branch is connected to the patch. First horizontal branches of adjacent EBG units are connected to each other. A circuit board including the aforementioned EBG structure is also provided.

An ultra-wideband electromagnetic band gap (EBG) structure includes multiple EBG units in an array. Each EBG unit includes a power plane, a dielectric substrate and a ground plane from top to bottom. The power plane includes a patch, a coupled complementary split ring resonator (C-CSRR) and a plurality of semi-improved Z-bridge structures. Each edge of the patch is provided with a semi-improved Z-bridge structure. The C-CSRR is provided within a ring formed by the semi-improved Z-bridge structures. The Z-bridge structure includes a first horizontal branch, a first vertical branch, a second horizontal branch and a second vertical branch connected in sequence. The second vertical branch is connected to the patch. First horizontal branches of adjacent EBG units are connected to each other. A circuit board including the aforementioned EBG structure is also provided.

A method for forming a modified resonator is provided. In one aspect, the method includes obtaining a resonator on top of a substrate, thereby forming an interface area between a bottom surface of the resonator and a top surface of the substrate. The resonator can include niobium or tantalum. The method also includes contacting the resonator and the substrate with a liquid acidic etching solution selected so as to have a higher etch rate towards the substrate than towards the resonator and a nonzero etch rate towards the resonator.

A method for forming a modified resonator is provided. In one aspect, the method includes obtaining a resonator on top of a substrate, thereby forming an interface area between a bottom surface of the resonator and a top surface of the substrate. The resonator can include niobium or tantalum. The method also includes contacting the resonator and the substrate with a liquid acidic etching solution selected so as to have a higher etch rate towards the substrate than towards the resonator and a nonzero etch rate towards the resonator.