All-Optical Blister Test of Suspended Graphene Using Micro-Raman Spectroscopy

Graphene adheres very strongly to solids and is impermeable to many gases, which allows the formation of suspended graphene blisters of controllable shape. The authors use micro-Raman spectroscopy to perform contactless measurement of the topography and stress/strain parameters of these blisters. This unique ``all-optical blister test'' can be generalized to other systems and invites applications in pressure sensing and nanoelectromechanical systems (NEMS).