Graphene Oxide: A New Functional Material for Optical Waveguide Devices
Abstract
It is observed that the TM-light propagation loss is low for GO coating thickness up to 0.4 m. When the GO coating thickness is increased above 0.4 m, TM-light becomes unguided in the waveguide, resulting in an abrupt increase in propagation loss to more than 60 dB/mm. On the other hand, the propagation loss of TE-polarised light increases to 44.6 dB/mm in GO-coated waveguides with a 0.34 m GO coating - before decreasing to 14.2 dB/mm in GO-coated waveguides with a GO coating thickness of 0.71 m. With the extinction coefficient profile of TM- and TE-polarised light of GO-coated waveguides with different GO thicknesses, the complex refractive index of GO coating is obtained using FEM analysis. The complex refractive index of our GO coating, with TE- and TM-polarised light, are 1.66+0.07i and 1.61+0.001i, respectively. The uncertainties of these values are smaller by an order of magnitude when compared to values measured using the conventional method of spectroscopic ellipsometry.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 27, 2019
- Accession Number
- AD1085829
Entities
People
- Wu Y. Chong
Organizations
- Universiti Malaya