Method of manufacturing a spectral filter for green and shorter wavelengths
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United States of America Patent
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Nov 14, 2006
Grant Date -
Mar 11, 2004
app pub date -
Jun 4, 2003
filing date -
Jun 4, 2002
priority date (Note) -
Expired
status (Latency Note)
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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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