Partitioned-cavity tunable fabry-perot filter

G - Physics – 01 – J

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G01J 3/26 (2006.01) G02F 1/21 (2006.01)

Patent

CA 2540376

A tunable Fabry-Perot filter that is less sensitive to angle of incidence is formed by replacing the cavity (air gap) with a partitioned cavity that has an effective refractive index greater than one. The partitioned cavity includes a pair of partitioned cavity dielectric layers formed on the reflectors on either side of the variable air gap. Each of the dielectric layers has an optical thickness that is less than one fourth the shortest wavelength in the tuning range of the filter. The resulting three-layer partitioned cavity has an effective optical thickness substantially equal to an integral multiple (m) of one half the transmitted wavelength within the tuning range of the filter.

Selon l'invention, un filtre Fabry-Pérot accordable moins sensible à l'angle d'incidence est formé par remplacement de la cavité (entrefer) par une cavité cloisonnée présentant un indice de réfraction effectif supérieur à un. La cavité cloisonnée comprend deux couches diélectriques à cavité cloisonnée formées sur les réflecteurs, de part et d'autre de l'entrefer variable. Chaque couche diélectrique présente une épaisseur optique inférieure au quart de la longueur d'onde la plus courte dans la gamme d'accord du filtre. La cavité cloisonnée à trois couches ainsi obtenue présente une épaisseur optique effective sensiblement égale à un multiple entier (m) de la moitié de la longueur d'onde transmise dans la gamme d'accord du filtre.

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