Honeywell G.m.b.h.

Other

Sau K Lo

James C Lee

David K Greenlaw

Ronald E Peterson

A solid state form of a dye-solution absorption filter is disclosed. Physical vapor depositable (i.e., evaporable) dyes are codeposited with a polyester matrix in a vacuum system to randomly disperse dye molecules in a solid dilutant. The dyes are selected to absorb at the wavelengths of interest. Dilution in a transparent matrix affords narrow band absorption and good out of band transmittance. Multilayer configurations allow absorption of a plurality of wavelengths. The filter coating conforms to curved and sharply contoured surfaces and layers only 10 microns thick afford very high absorptance.

Narrow band selective absorption filter

An optical filter comprising a first substance which is substantially transparent to light within a selected first frequency range and having a first index of refraction; and a second substance which has at least one resonance frequency within said first frequency range and having a second index of refraction which is substantially the same as said first index of refraction at all of the frequencies within said first frequency range except for frequencies near said resonance frequency.

Growing community of inventors

Fridley, MN, United States of America

Sau K Lo