Composite optical materials, uses of composite optical materials and methods for the manufacture of composite optical materials

A thermochromic composite optical body formed of a composite optical material. The material has a three dimensionally periodic arrangement of particles of a first material having refractive index n1 disposed in a matrix of a second material, different to the first material, having refractive index n2. The material is capable of being modified by an external stimulus to provide an optical effect based on the three dimensionally periodic arrangement of particles. At a first condition of the external stimulus, the body is substantially transparent and satisfies at least one of:wherein [Delta]n is the modulus of the difference between n1and n2at the first condition of the external stimulus, nvais the volume average refractive index of the body at the first condition of the external stimulus, [lambda] is a wavelength of light corresponding to the three dimensionally periodic arrangement of particles and L is the thickness of the body at the first condition of the external stimulus. At a second condition of the external stimulus, different from the first condition, the body provides a colour effect due to a corresponding change in n1and/or n2.

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Patents:
GB 2,472,987

Inventor(s): BAUMBERG JEREMY JOHN [GB]; SNOSWELL DAVID ROBERT EVAN [GB]; KONTOGEORGOS ANDREAS [GB]; SUSSMAN JASON MICHAEL [US]; SPAHN PETER W

Type of Offer: Sale



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