Nanoimprinting Metal-Containing Nanoparticles-Doping-Grating for High Polarization Performance Light Emitting Chips by Scattering-Induced Enhancement.

Polarized radiative semiconductor luminous chips have huge application potentials in lots of high value-added fields. Integrating a subwavelength grating is recognized as the most promising method for development of polarized chips, but still faces the challenge of lower polarized radiation performance. The paper proposed and developed a scattering-induced polarization enhancement light emitting diodes chips by directly nanoimprinting metal-containing nanoparticles-doping-grating on the top surface of a common flip-chips. The utilization rate of quantum well light emission on the developed polarized chips was improved more than 30%. More attractively, the doped scattering nanoparticles play as a scattering-induced polarization state converter that sandwiched in the top aluminum grating and bottom silver reflector on the chips. The originally non-radiative light with an electric field vector parallel to the grating lines is reflected back and forth among the sandwich until it changes to the perpendicular vibration mode to radiate outside the chips. Therefore, the polarization extinction ratio was greatly improved compared with the samples without doping.