A polarization-independent diffractive optical element (DOE) consisting of dual photonic crystal (PhC) slabs was proposed for unidirectional light transmission at telecom wavelengths. Employing rigorous coupled wave analysis (RCWA) together with genetic algorithm (GA), the contrast ratios of designed DOE with 10nm precision at normal incidence from opposite directions reached to 33.6 dB and 32.2 dB with transmittance differences of 84.57% and 87.63% at wavelengths of 1310 nm and 1550 nm, respectively. The presented DOE showed great promising for applications in optical communication.
A 2D supercell grating was proposed to work as a polarization beam splitter (PBS) at normal incidence, which directed TE-polarized light to (0, ±1) order and TM-polarized light to (±1, 0) order. The diffraction efficiency of targeted transmitting orders reached 71.32% and the extinction ratio exceeded 19.97 dB for TE- or TM- polarized illumination with 1550nm wavelength. Meanwhile, the (0, 0) order was well suppressed. The proposed 2D supercell grating is suitable for compact polarization systems.
Two issues that hindering fast developments of diffractive waveguides based on surface relief grating (SRG) for augmented reality (AR) applications: light leakage at out-coupler and low light efficiency. A layer of subwavelength metal wire grid on commonly used protective glass sheet above diffractive waveguide was designed to prohibit the light leakage and reflect them back to AR waveguide for recycling light usage. One-dimensional (1D) SRG based AR waveguide was analyzed under TE-polarized illumination at 532nm wavelength with 30° field-of-view (FOV). It was demonstrated that 80% efficiency improvement and 9% intensity uniformity increasement could be obtained with completely prohibited light leakage by nanostructures glass cover, compared with that on planar protective glass.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.