Novel self‐organized nanograting structures with periodically assembled crystalline and amorphous phases are created in La2O3–Ta2O–Nb2O5 glass by an ultrafast laser. Heat accumulation and the Ta2O5 content strongly contribute to the nanograting formation. The fabricated nanograting arrays exhibit a broadband polarization‐dependent attenuation effect in the near‐infrared region, which indicates the potential uses in the optical information processing at communication wavelengths.
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