Investigation of quantum dot sensitization and light polarization effect on absorption spectrum of TiO2 nanorods

In this paper We do our numerical simulations based on finite difference time domain (FDTD) method which is an appropriate and fast method to study the effect of quantum dot (QD) sensitization and light polarization on optical absorption spectrum of Titanium oxide (TiO2) nanorods (NRs). Strong light confinement in semiconductor NRs results in optical mode resonances which makes NRs good candidates for different applications such as solar cells. In this work we study three different light polarization states and their influence on optical absorption of TiO2 NRs. We show that the Z-polarize state is thebest case to enhance light absorption of NRs. Also we utilize Cadmium Selenide (CdSe) QDs to sensitize TiO2 NRs in order to enhance their absorption spectrum. In fact CdSe QDs with different sizes have different optical band gaps results in ability to absorb light with wider wavelength range.

Investigation of quantum dot sensitization and light polarization effect on absorption spectrum of TiO2 nanorods Keywords:

Nanorods , Leaky-mode resonance , Quantum dots , Light polarization effect