Abstract
We demonstrate an alternative approach to tuning the refractive index of materials. Current methodologies for tuning the refractive index of a material often result in undesirable changes to the structural or optoelectronic properties. By artificially layering a transparent conducting oxide with a lower refractive index material the overall film retains a desirable conductivity and mobility while acting optically as an effective medium with a modified refractive index. Calculations indicate that, with our refractive index change of 0.2, a significant reduction of reflective losses could be obtained by the utilisation of these structures in optoelectronic devices. Beyond this, periodic superlattice structures present a solution to decouple physical properties where the underlying electronic interaction is governed by different length scales.
Highlights
We demonstrate an alternative approach to tuning the refractive index of materials
We demonstrate the use of a superlattice composed of alternating thin pseudo 2D layers of a Transparent Conducting Oxides (TCOs) and a lower electron density material
X-Ray Diffraction (XRD) of the superlattices demonstrated the amorphous InGaZnO4 (a-IGZO) to be amorphous and ZnO:Al to be crystalline for all samples
Summary
Current methodologies for tuning the refractive index of a material often result in undesirable changes to the structural or optoelectronic properties. This emitted light will be out of phase with the original incident wave and cause interference This results in an apparent reduction of the rate of propagation of light through the medium and a refractive index >1. The situation is more complex if the choice of material is governed by more than just the refractive index This is most apparent in the current generation of Transparent Conducting Oxides (TCOs), where the key requirements are high optical transparency and electrical conductivity. One of the leading methodologies for the tuning of n is cation substitution, wherein atoms of a material are replaced by those of a lower electron density material This results in an overall reduction of the electron density of the medium and the refractive index
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
