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Towards a future lab - on - a - chip spectrometer , we demonstrate a compact chip - scale air - clad silicon pedestal waveguide as a Mid - Infrared ( Mid - IR ) sensor capable of in situ monitoring of organic solvents .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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