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On the contrary, if temperature goes down to the solid phase or liquid crystalline phase, special regularity of the “order” breaks the symmetry of the space. So, both the “Ordering” and “Spherical isotropic symmetry” never coexist simultaneously. However, we have found the novel isotropic smectic blue phase (SmBPIso), which show the appearance of the “Ordering” does not break the macroscopic “symmetry” of the space1. We call this is “Isotropic order”. Soft condensed matter system can form the huge length scale order. SmBPIso is characterized by the simultaneous presence of the local order parameter of an helix and of a smectic layer, while being spontaneously isotropic without any characteristic discontinuity on a mesoscopic length scale. It is great advantage for the optical devices that the spectrum of the iridescent color of SmBPIso is completely equivalent by the changing the viewing angle because of the special isotropic symmetry and its wavelength can be successively controlled by changing temperature. Recently, we found the color can be tuned by shining the strong pulsed laser light. Then we can artificially design the special pattern of the “structural color” by scanning and on/off the laser light beam. Response time of the color shift is not so fast but not so slow (~200msec) in spite of the existence of the complicated inter-connected multi-lamellar structure. We also found that two different types of characteristic fluctuation modes in the SmBP’s. Faster fluctuation mode can be attributed to the orientation fluctuation localized in the intra lattice of the blue phase. Relaxation frequency and its amplitude is very similar to that obtained in the cholesteric blue phase. Relaxation frequency of another slower mode is very close to the response time of the light induced structural color change. Then, slower relaxation mode can be assigned to the collective fluctuation mode of the shrinkage/elongation of the inter-connected multi-lamellar structure. Position dependent color change can be drawn by scanning the laser light. 1. J. Yamamoto, I. Nishiyama, M.Inoue and H. Yokoyama, Nature, 437, 525-528(2005). 6@RSUVabctuvwxˆ•ŸЁІЈ­ЎЏРСТЙ М ! 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