Temperature activated optical films

G - Physics – 02 – B

Patent

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G02B 5/28 (2006.01)

Patent

CA 2724846

The present invention discloses a multilayer dielectric optical structure wherein one of the optical materials in the multilayer structure shows an optically isotropic state above and a birefringent state below a characteristic temperature Tc near the room temperature. The optical structure reflects a predetermined wavelength range of electromagnetic radiation above the Tc but allow the same to transmit through below the Tc. The predetermined wavelength can be the near infrared radiation from 700nm to 2500nm, and the optical structure rejects solar heat in warm summer days but admits the same to interior on a colder winter day.

La présente invention porte sur une structure optique diélectrique multicouche dans laquelle l'un des matériaux optiques dans la structure multicouche présente un état optiquement isotrope au-dessus et un état biréfringent au-dessous d'une température caractéristique Tc proche de la température ambiante. La structure optique reflète une plage de longueurs d'onde prédéterminée de rayonnement électromagnétique au-dessus de Tc mais permet à celle-ci d'être transmise au-dessous de Tc. La longueur d'onde prédéterminée peut être le rayonnement proche infrarouge de 700 nm à 2 500 nm, et la structure optique rejette de la chaleur solaire les jours d'été chauds mais admet celle-ci à l'intérieur les jours d'hiver plus froids.

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