Microstructures of composite materials can exhibit properties significantly different from their individual constitution. By utilizing these unique characteristics, we design diffractive optical elements to demonstrate transmission-only polarizers for telecommunications. The transmittance and the extinction ratio of the proposed structure are and at wavelengths, respectively. The average reflectance for random polarization is less than 1% at . The methods are applicable to diffractive optics, e.g., in the ultraviolet and visible spectrum.
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