An image sensor (110, 120, 130a, 130b, 140, 150a, 150b) comprising: a light sensing layer configured to generate an electrical signal using incident light; a color filter layer disposed on the light sensing layer, wherein the color filter layer comprises a two-dimensional array of a plurality of color filters comprising: a first color filter configured to transmit light in a first wavelength band and disposed directly on the light sensing layer; a second color filter configured to transmit light in a second wavelength band, different from the first wavelength band; and an isolation layer disposed between and in contact with adjacent ones of the plurality of color filters, wherein a refractive index of the isolation layer is lower than a refractive index of any one of the plurality of color filters, wherein the isolation layer is further disposed directly on a light incident surface of the first color filter and between and in contact with the second color filter and the light sensing layer; and characterized in that the isolation layer is not disposed between the first color filter and the light sensing layer and is not disposed on the light incident surface of the second color filter, and a surface level of a light incident surface of the second color filter is identical to a surface level of the light incident surface of the first color filter. a light sensing layer configured to generate an electrical signal using incident light; a color filter layer disposed on the light sensing layer, wherein the color filter layer comprises a two-dimensional array of a plurality of color filters comprising: a first color filter configured to transmit light in a first wavelength band and disposed directly on the light sensing layer; a second color filter configured to transmit light in a second wavelength band, different from the first wavelength band; and an isolation layer disposed between and in contact with adjacent ones of the plurality of color filters, wherein a refractive index of the isolation layer is lower than a refractive index of any one of the plurality of color filters, wherein the isolation layer is further disposed directly on a light incident surface of the first color filter and between and in contact with the second color filter and the light sensing layer; and characterized in that the isolation layer is not disposed between the first color filter and the light sensing layer and is not disposed on the light incident surface of the second color filter, and a surface level of a light incident surface of the second color filter is identical to a surface level of the light incident surface of the first color filter. a first color filter configured to transmit light in a first wavelength band and disposed directly on the light sensing layer; a second color filter configured to transmit light in a second wavelength band, different from the first wavelength band; and an isolation layer disposed between and in contact with adjacent ones of the plurality of color filters, wherein a refractive index of the isolation layer is lower than a refractive index of any one of the plurality of color filters, wherein the isolation layer is further disposed directly on a light incident surface of the first color filter and between and in contact with the second color filter and the light sensing layer; and characterized in that the isolation layer is not disposed between the first color filter and the light sensing layer and is not disposed on the light incident surface of the second color filter, and a surface level of a light incident surface of the second color filter is identical to a surface level of the light incident surface of the first color filter.