Multilayer thin film dielectric bandpass filter

G - Physics – 02 – F

Patent

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G02F 1/225 (2006.01) G02B 5/28 (2006.01)

Patent

CA 2220291

A design for producing bandpass filters with passbands that are centered at the same wavelength for each mode of polarization. Filters are of the all-dielectric type that consist of single and multiple cavities of bandpasses. All of the layers are of the Quarter Wave type for ease of manufacture with the possible exception of the last few layers being modified to reduce reflection into a new media. The basic structure of the multi-layer bandpass filter is as follows: (XY)n(YY)(XX)m(YY)(YX)n where n and m are integers and wherein X is one of a high refractive index layer and a low refractive index layer; and, wherein Y is the other of the high and low refractive index layer, X and Y being opposite indexes of refraction.

Modèle de production de filtres passe-bande à bandes passantes centrées sur la même longueur d'onde pour chaque mode de polarisation. Les filtres sont de type entièrement diélectrique consistant en cavités uniques et multiples à bandes passantes. Toutes les couches sont de type quart d'onde pour des raisons de facilité de fabrication, à l'exception peut-être des quelques dernières couches modifiées afin de réduire la réflexion vers un nouveau support. La structure de base du filtre passe-bande multicouche est la suivante : (XY)n(YY)(XX)m(YY)(YX)n où n et m sont des nombres entiers; et où X et Y correspondent respectivement à une couche à indice de réfraction élevé et à une couche à indice de réfraction faible, ou vice-versa, X et Y étant des indices de réfraction opposés.

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