21560
When an incident polarization parallel to the pair axis is rotated by 90 degrees , a single potential well turns into multiple potential wells separated by a distance smaller than the diffraction limit ; this is associated with super - resolution optical trapping .
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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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