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

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Text this: Refractive index sensor based on an abrupt biconical fiber taper