17 September 2014 Parity-time symmetry diffractives implementing unidirectional diffraction–application to optical combiners
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We review our work regarding a new class of couplers, resonators and free space gratings that employ the concept of Parity-Time (PT) symmetry in optics. PT structures can be implemented as diffractive gratings having complex refractive index profiles. The complex index profile integrates both phase and loss modulations as in conventional gratings, but also gain modulation. We review our work on integrated waveguide grating structures (Bragg regime) and free space structures (Raman Nath regime). Uni-directionality in free space can be applied to the development of novel optical combiners for the HMD/HUD fields. Such elements can be replicated in mass via lithography/embossing, with similar efficiency as conventional volume HOEs (Holographic Optical Elements) such as photopolymers.
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Bernard Kress, Bernard Kress, Mykola Kulishov, Mykola Kulishov, "Parity-time symmetry diffractives implementing unidirectional diffraction–application to optical combiners", Proc. SPIE 9202, Photonics Applications for Aviation, Aerospace, Commercial, and Harsh Environments V, 92020F (17 September 2014); doi: 10.1117/12.2064352; https://doi.org/10.1117/12.2064352

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