Light detecting device, light detecting system, and filter array

A light detecting device comprising:

• a filter array including filters that are arranged two-dimensionally;
• and
• an image sensor including light detection elements, wherein
• the filters include a first filter and a second filter,
• each of the first filter and the second filter includes a first reflective layer, a second reflective layer, and an intermediate layer between the first reflective layer and the second reflective layer and has a resonance structure,
• each of the first filter and the second filter has a transmission spectrum such that first light passing through the first filter has first peaks as first local maximum values and second light passing through the second filter has second peaks as second local maximum values,
• the first peaks result from the resonance structure of the first filter,
• the second peaks result from the resonance structure of the second filter,
• each of the light detection elements is disposed at a position where each of the detection elements receives passing light that passes through at least one of the filters, the passing light having peaks as local maximum values, and
• each of the light detection elements detects the peaks included in the passing light.