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  _____      ___     __   __    _____     _____   
 |__  //    / _ \\   \ \\/ //  |  ___||  / ____|| 
   / //    | / \ ||   \   //   | ||__   / //---`' 
  / //__   | \_/ ||   / . \\   | ||__   \ \\___   
 /_____||   \___//   /_//\_\\  |_____||  \_____|| 
 `-----`    `---`    `-`  --`  `-----`    `----`

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Text this: Split-ball resonator as a three-dimensional analogue of planar split-rings