29116
To extend light transmission beyond lambda = 3 . 7 mu m , a spectral region where a typical silicon dioxide under - clad is absorbing , we fabricate a unique air - clad silicon pedestal waveguide .
 Chemical: silicon dioxide; Chemical: silicon
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: silicon dioxide; Chemical: silicon