1674
Inspired by their smart photo - switchable characteristics , a variety of light - driven functional materials have been exploited , such as ultrahigh - density optical data storage , molecular switches , logic gates , molecular wires , optic / electronic devices , sensors , bio - imaging and so on .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None