RULE BREAKING. “Stretching ordered polymer opals in different directions transforms the fcc photonic crystal into correspondingly distorted monoclinic lattices. This breaks the conventional selection rules for scattering from the crystal planes, yielding extra multiply scattered colors when the phase-breaking stretch is in specific directions.”
http://www.np.phy.cam.ac.uk/uploads/2010/prl10-stretchtune-opalopt.pdf
linkedin post 2022-06-29 05:12:48
Nigel Fleming
September 21, 2022