Spectral filter for green and shorter wavelengths

Details Spectral filter for green and shorter wavelengths Spectral filter for green and shorter wavelengths

2006-04-18

2006-04-18

Pak, Sung (Department: 2874)

Optical waveguides

With optical coupler

Particular coupling function

C385S031000

Reexamination Certificate

active

07031566

ABSTRACT:
The UV, deep UV and/or far UV (ultraviolet) filter transmission spectrum of an MPSi spectral filter is optimized by introducing at least one layer of substantially transparent dielectric material on the pore walls. Such a layer will modify strongly the spectral dependences of the leaky waveguide loss coefficients through constructive and/or destructive interference of the leaky waveguide mode inside the layer. Increased blocking of unwanted wavelengths is obtained by applying a metal layer to one or both of the principal surfaces of the filter normal to the pore directions. The resulting filters are stable, do not degrade over time and exposure to UV irradiation, and offer superior transmittance for use as bandpass filters. Such filters are useful for a wide variety of applications including but not limited to spectroscopy and biomedical analysis systems.

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