Wide field-of-view interference filter based on strong light matter coupling

Distributed Bragg reflectors are an invaluable component in photonics with wide applications across many fields. They can be designed to give high transmission or reflection at specific wavelengths, but these characteristics vary strongly with the angle of incidence. In many fields, ranging from fluorescence microscopy to optical communications it would be desirable to have wavelength filters which exhibit the same transmission spectrum across a range of incidence angles. Here we show that strong light-matter coupling can be used to make a polaritonic narrowband filter which maintains the desired transmission spectrum for much wider ranges of angles of incidence. We experimentally demonstrate a device with maximum transmission >0.7, with narrowband transmission <20 nm, and wide-field of view of 44 degrees.