Text this: Probing topological protection using a designer surface plasmon structure

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