Colloidal photonic crystals

C - Chemistry – Metallurgy – 30 – B

Patent

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C30B 5/00 (2006.01) G02B 6/122 (2006.01) G02B 6/14 (2006.01)

Patent

CA 2384102

A method of growing robust large area colloidal photonic crystals and devices produced thereby. A suspension of monosized colloidal spheres (1) is subjected to a composite shear (6) by applying a sequential set of shearing forces. The crystalline layers within the colloid experience shearing forces with components in both x and y directions, forcing the colloid into a single face-centred-cubic structure in preference to a twinned face-centred-cubic structure. The method may also comprise the use of a dispersion medium which is capable of undergoing a controllable phase change from a liquid phase to a solid phase. The crystal may be fixed into a single face-centred cubic structure.

L'invention concerne un procédé de formation de cristaux photoniques colloïdaux robustes à grande surface et des dispositifs destinés à ce procédé. Une suspension de sphères colloïdales unidimensionelles (1) est soumise à un cisaillement composite (6) par application d'un ensemble séquentiel de forces de cisaillement. Les couches cristallines à l'intérieur du colloïde subissent des forces de cisaillement avec des composants à la fois dans les sens x et y, ce qui contraint le colloïde à former une structure cubique à faces centrées simple, par préférence à une structure cubique à faces centrées maclée. Ce procédé peut également faire intervenir un support de dispersion pouvant subir un changement de phase régulable entre une phase liquide et une phase solide. Ce cristal peut être fixé à une structure cubique à faces centrées simple.

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