Highly Efficient\nand Linearly Polarized Light Emission\nof Micro-LED Integrated with Double-Functional Meta-Grating

Linearly polarized micro light-emitting diodes (LP-Micro-LEDs)\nexhibit exceptional potential across diverse fields. The existing\nmethods to introduce polarization to initially unpolarized Micro-LEDs\nand to further enhance the degree of polarization are, however, at\nthe expense of low luminous efficiency. We fabricated a GaN-based\nblue Micro-LED integrated with a Al nanograting and a specially designed\nAg/GaN meta-grating, which overcomes the dilemma between the luminous\nefficiency and polarization degree by simultaneously introducing the\neffects of mode selection and energy recycling. The fabricated LP-Micro-LED\nachieves an average polarization extinction ratio (ER) of 21.92 dB\nwithin ±60°, showing a 2.04-fold increase in efficiency\nand a 1.32-fold increase in ER compared to the Ag reflector design.\nThis approach opens the way toward the next generation of high-efficiency\nand low-cost optoelectronic devices in encryption, displays, optical\ncommunication, and medicine.