Optical filter and imaging device

Abstract

Provided is an optical filter comprising a glass substrate, wherein: a first barrier layer, a resin layer, and a first multilayer film are disposed on a first main surface of the glass substrate in order from the glass substrate; a second barrier layer and a second multilayer film are disposed on a second main surface of the glass substrate in order from the glass substrate; the glass substrate is a phosphate glass comprising an infrared absorber; the first barrier layer and the second barrier layer each independently comprise at least 80 mol % of an oxide of at least one metal selected from the group consisting of titanium (Ti), niobium (Nb), tantalum (Ta), and hafnium (Hf); and the first multilayer film and the second multilayer film are each independently constituted by a plurality of dielectric layers.

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