POLARIZATION PROPERTIES OF QUANTUM DOTS IN LEDs MATERIALS
We want to develop a simple method for the detection of the polarization properties in the near field of Indium Gallium Nitrides Quantum Dots. The apparatus is a typical SNOM setup where multiple-steps chemically etched 100nm apertured optical probe is collecting the optical signal in the vicinity of the surface of the sample. In this configuration, if the sample is not sensitive to polarization, fluorescence is induced with same intensity for all angles. However if the sample shows birefringence or dichroic properties, light will be modulated in intensity. As a result a lock-in amplifier connected to the detector can directly generate a map of the sample dichroism. The dichroism map can be compared to the simultaneously taken photoluminescence map.
We want to investigate with this technique InGaN/GaN materials, basic samples for recent LED devices. Students and researchers interested in this topic please contact us. Yokohama City University welcomes International students and post-docs.
