Fig. 4: Demonstration of application concepts.
From: A flexible topo-optical sensing technology with ultra-high contrast
a An in-plane logic strain sensor with stepwise responses for large deformation sensing. b A 2D spy barcode design with a state of ‘OFF’ at ε = 0 and an ‘ON’ state at ε = 0.52. c An adaptive topo-optical grid under equi-biaxial compression. d A flexible tactile sensor to detect the change on local curvature with (left) schematic illustration of sensing principle, (middle) observation of conformal sensing under reflective microscopy, (right) phase diagram of the conformal tactile sensing. All scale bars are 100 μm.
