Fig. 3: Mechano-optical devices based on 2D CTO DUV hydrogel.
From: Deep ultraviolet hydrogel based on 2D cobalt-doped titanate
a A photo of the CTO hydrogel (left) and scheme (right) of its fabrication process. b Compressive stress–strain curves of the CTO hydrogel. c Phase retardation induced by the uniaxial compression of hydrogel in the direction of light propagation. d Cycling test for the reversibility and stability of DUV modulation during compression. e–g Similar to b–d, but presenting the process of stretching. DUV light intensity: 200 mW cm−2
