@article {1072791,
	title = {Observation of Nanoscale Refractive Index Contrast via Photoinduced Force Microscopy},
	journal = {ACS Photonics},
	volume = {4},
	number = {4},
	year = {2017},
	pages = {846-851},
	url = {http://pubs.acs.org/doi/abs/10.1021/acsphotonics.6b00911},
	author = {Antonio Ambrosio and Robert Charles Devlin and Federico Capasso and William L. Wilson}
}
