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Plasmonic nanoantennas facilitate the manipulation of light fields on deeply sub - diffraction - limited length scales , but high dissipative losses in metals make new approaches for an efficient energy transfer in extended on - chip integrated plasmonic circuits mandatory .
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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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