13931
This paper studies the nonlinear behavior of a nano - optomechanical actuator , consisting of a free - standing arc in a ring resonator that is coupled to a bus waveguide through evanescent waves .
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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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