Optical filter and optical device utilizing same

An optical filter comprising:

• a first optical filter region and a second optical filter region adjacent to each other,
• wherein each of the first optical filter region and the second optical filter region comprises
• a first reflection layer and a second reflection layer separated from each other;
• a dielectric region interposed between the first reflection layer and the second reflection layer and in which two materials, of which refractive indexes are different, are alternately disposed, one of the two materials having a first width and another of the two materials having a second width;
• a first buffer layer disposed between the dielectric region and the first reflection layer;
• and
• a second buffer layer disposed between the dielectric region and the second reflection layer,
• wherein the first optical filter region comprises a first filter region and a second filter region in which a relative width ratio of the first width and the second width is different from a relative width ratio of the first width and the second width in the first filter region,
• wherein the second optical filter region comprises a first filter region and a second filter region in which a relative width ratio of the first width and the second width is different from a relative width ratio of the first width and the second width in the first filter region,
• wherein the second buffer layer of first optical filter region has a thickness greater than a thickness of the second buffer layer of second optical filter region, and
• wherein a relative volume ratio of the two materials alternately disposed in the first optical filter region and is different from a relative volume ratio of the two materials alternately disposed in the second optical filter region.

An optical device comprising:

• an optical detection region including an image sensor region and a spectrum sensor region;
• a color filter layer at the image sensor region on the optical detection region, the color filter layer is configured to filter an incident light to at least R, G, and B;
• and
• a spectral filter at the spectrum sensor region on the optical detection region, the spectral filter including a plurality of filter regions,
• wherein the color filter layer and the spectral filter are configured a unit pixel,
• wherein each of the plurality of filter regions comprises
• a first reflection layer and a second reflection layer separated from each other;
• a dielectric region interposed between the first reflection layer and the second reflection layer and in which two materials, of which refractive indexes are different, are alternately disposed;
• and
• a buffer layer disposed between the dielectric region and at least one of the first reflection layer and the second reflection layer,
• wherein the plurality of filter regions includes, at least, a first filter region and a second filter region adjacent to the first filter region,
• the first filter region has a first structure and the second filter region has a second structure different from the first structure,
• wherein an overlap value of a pair of the plurality of filter regions is defined as Ip/Imax,
• wherein Ip defines a strength of a filter function at a point at which filter functions of the pair of the plurality of filter regions cross each other, and Imax denotes a maximum intensity of the filter function of the pair of the plurality of filter regions,
• wherein the first structure and the second structure are configured such that the overlap value of the first filter region and the second filter regions is about 0.4 to about 1, and
• wherein a full width at half maximum (FWHM) of the filter function of each of the first filter region and the second filter region is 100 nanometers or less.