發送短信 : Probing negative refractive index of metamaterials by terahertz time-domain spectroscopy

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