Simple Approach for High-Contrast Optical Imaging and Characterization of Graphene-Based Sheets
Abstract
A simple optical method is presented for identifying and measuring the effective optical properties of nanometer-thick, graphene-based materials, based on the use of substrates consisting of a thin dielectric layer on silicon. High contrast between the graphene-based materials and the substrate is obtained by choosing appropriate optical properties and thickness of the dielectric layer. The effective refractive index and optical absorption coefficient of graphene oxide, thermally reduced graphene oxide, and graphene are obtained by comparing the predicted and measured contrasts.
- Publication:
-
Nano Letters
- Pub Date:
- December 2007
- DOI:
- 10.1021/nl0714177
- arXiv:
- arXiv:0706.0029
- Bibcode:
- 2007NanoL...7.3569J
- Keywords:
-
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Materials Science
- E-Print:
- New measurements, calculations modified, discussion revised