Narrowband wavelength selective waveguide for see-through glasses

See-through glasses are a new type of portable mobile device; however, most existing designs cannot balance the requirements of field of view (FOV), optical efficiency, and system volume at the same time. Here we propose a design for ultra-compact see-through glasses by using a waveguide with embedded narrowband minus filters as the optical combiner. The optical combiner demonstrates wavelength selectivity and optional narrowband(s) and is based on inorganic materials. Compelling advantages of our approach are high light efficiency, stray ray suppression, full-color capacity, good stability, and low cost. A detailed calculation model is provided for analysis of the optical properties of the waveguide, and a proof-of-concept prototype is demonstrated that can convey a horizontal FOV of 31.4°. The FOV can be further enlarged by parameter adjustments.