5558
At the sub-micron ( μm ) level , the interaction between nanoparticles under high power laser heating raises additional near-field thermal issues such as thermal diffusivity , effective absorptivity , and extinction coefficients compared to larger scales .
 sub-micron, nanoparticles, power, laser, heating, as, diffusivity
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 sub-micron, nanoparticles, power, laser, heating, as, diffusivity