Indium-tin oxide thin film filter for dense wavelength...

Details Indium-tin oxide thin film filter for dense wavelength... Indium-tin oxide thin film filter for dense wavelength...

2006-03-28

2006-03-28

Dunn, Drew A. (Department: 2872)

Optical: systems and elements

Light interference

Produced by coating or lamina

C359S586000, C359S587000, C359S588000

Reexamination Certificate

active

07019906

ABSTRACT:
A DWDM thin film filter includes a substrate (11) and a film stack (12). The film stack comprises a plurality of cavities (13). Each cavity includes a first group of mirror layers (21), a second group of mirror layers (22), and a spacer layer (23). Each group of mirror layers includes a plurality of high refractive index thin films (31) and low refractive index thin films (32) alternately deposited one on another. The material of the high refractive index films is a composition of indium-tin oxide. In the preferred embodiment, a thin film filter having 160 layers of film can be produced. Such a thin film filter attains the same or better optical characteristics as a conventional DWDM thin film filter having 180 layers of film.

REFERENCES:
patent: 4846551 (1989-07-01), Rancourt et al.
patent: 5321539 (1994-06-01), Hirabayashi et al.
patent: 5914804 (1999-06-01), Goossen
patent: 6042752 (2000-03-01), Mitsui
patent: 6215592 (2001-04-01), Pelekhaty
patent: 6490381 (2002-12-01), Adair et al.

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