A new opto-mechanical effect in solids.

By H. Finkelmann, E. Nishikawa, G. Pereira, Mark Warner. Physical Review Letters, 2001

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Azobenzene photomechanics: prospects and potential applications (2012, background): “who observed a 20 % contraction in monodomain nematic LCEs consisting of a polysiloxane main chain and azobenzene crosslinks by irradiating the samples with UV light [238].”
Gaussian curvature from flat elastica sheets (2011, background): “Accordingly, they suffer large, reversible length change with either heating (Tajbakhsh & Terentjev 2001; Mol et al. 2005) or illumination (Finkelmann et al. 2001; Harris et al. 2005).”
A review of shape memory polymer composites and blends (2009, background): “by photoisomerization such as azobenzenes [178–180], photoinduced ionic dissociation such as triphenylmethane leuco deriva-”
Tuned, driven, and active soft matter (2015, background): “Apart from that, other routes of regulation or actuation were demonstrated experimentally, for example photo- [59, 60] or temperature-induced [61–64] deformations.”
Liquid-crystal materials find a new order in biomedical applications. (2007, background): “have proposed theoretically volume deformation changes as large as 400% through optically driven effects in nematic elastomer”