Arbitrary helicity control of circularly polarized light from lateral-type spin-polarized light-emitting diodes at room temperature

Abstract

We demonstrate arbitrary helicity control of circularly polarized light (CPL) emitted at room temperature from the cleaved side-facet of a lateral-type spin-polarized light-emitting diode (spin-LED) with two ferromagnetic electrodes in an anti-parallel magnetization configuration. Driving alternate currents through the two electrodes results in polarization switching of CPL with frequencies up to 100 kHz. Furthermore, tuning the current density ratio in the two electrodes enables manipulation of the degree of circular polarization. These results demonstrate arbitrary electrical control of polarization with high speed, which is required for the practical use of lateral-type spin-LEDs as monolithic CPL light sources.

References in corpus (4)

• Circularly-Polarized Light Emission from Semiconductor Planar Chiral Photonic Crystal
• Spin relaxation of conduction electrons in bulk III-V semiconductors
• Pure circular polarization electroluminescence at room temperature with spin-polarized light-emitting diodes
• A spin light emitting diode incorporating ability of electrical helicity switching

Cited by in corpus (4)

• Spin-Lasers: Spintronics Beyond Magnetoresistance
• Monte Carlo simulation of scattered circularly polarized light in biological tissues for detection technique of abnormal tissues using spin-polarized light emitting diodes
• Intensity equations for birefringent spin lasers
• The birefringent spin-laser as a system of coupled harmonic oscillators