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We experimentally demonstrate that plasmonic nanoparticles embedded in the evanescent field of subwavelength optical waveguides ( WGs ) are highly sensitive to distances normal to the propagation of light , showing an ~ 10 x increase in spatial resolution compared to the optical field decay of the WG .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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