Multi frequency filter arrays for low cost spectrometers

摘要

Optical filters, optical sensor arrays and methods for assembling the same and systems incorporating the same are disclosed. An optical filter may include a first stack, a second stack and a spacer layer. The first stack may include alternating layers of a first material having a first refractive index and a second material having a second refractive index that differs from the first refractive index. The second stack may include alternating layers of the first material and the second material. The spacer layer may be positioned between the first stack and the second stack to form a stacked assembly. The spacer layer may include a patterned layer including the first material and the second material. At least a portion of the patterned layer may include a pattern composed of the first material.

主权项

1. An optical filter for filtering a wavelength of interest, the optical filter comprising:
a first stack comprising alternating layers of a first material having a first refractive index and a second material having a second refractive index, wherein the first refractive index and the second refractive index are different; a second stack comprising alternating layers of the first material and the second material; and a spacer layer positioned between the first stack and the second stack to form a stacked assembly, wherein the spacer layer comprises a patterned layer comprising the first material and the second material, wherein at least a portion of the patterned layer comprises a uniformly repeating pattern composed of the first material, wherein an effective refractive index of the spacer layer at the wavelength of interest is determined based on a percentage of the patterned layer covered by the pattern, the first refractive index, and the second refractive index.