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

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Text this: Fiber optic interferometer sensor for responsive hydrogel based heavy metal cation detection