Optical devices and methods employing nanoparticles,...

G - Physics – 01 – J

Patent

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G01J 3/44 (2006.01) G01N 21/65 (2006.01)

Patent

CA 2439907

An optical sensing enhancing material (and corresponding method of making) comprising: a medium, the medium comprising a plurality of aggregated nanoparticles (32) comprising fractals; and a microcavity (44), wherein the medium is located in a vicinity of the microcavity. Also an optical sensor and sensing method comprising: providing a doped medium, the medium comprising a plurality of aggregated nanoparticles comprising fractals, with the material; locating the doped medium in the vicinity of a microcavity; exciting the doped medium with a light source; and detecting light reflected from the doped medium. Also an optical sensing enhancing material comprising a medium, the medium comprising a semicontinuous metal film of randomly distributed metal particles and their clusters at approximately their percolation threshold. The medium preferably additionally comprises a microcavity/microresonator. Also devices and methods employing such material.

L'invention porte sur un matériau d'amélioration de la sensibilité optique (et le procédé associé de fabrication) comprenant : un support présentant une pluralité de nanoparticules agglomérées (32) renfermant des fractales ; et une microcavité (44) à proximité de laquelle le support est logé. Font aussi l'objet de cette invention un capteur optique et un procédé de captage consistant : à apporter un support dopé comprenant une pluralité de nanoparticules agglomérées renfermant des factales avec le matériau ; à disposer le support dopé à proximité d'une microcavité ; à exciter le support dopé à l'aide d'une source lumineuse ; et à détecter la lumière réfléchie du support dopé. Fait encore l'objet de cette invention un matériau d'amélioration de captage optique comprenant un support renfermant un fil métallique en semi-continu de particules métalliques distribuées de manière aléatoire et leurs groupes approximativement au niveau de leur seuil de filtration. Le support comprend de préférence en outre une microcavité/microrésonateur. Font finalement l'objet de cette invention des dispositifs et des procédés utilisant ce matériau.

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