Coherent absorption of light by graphene and other optically conducting surfaces in realistic on-substrate configurations

Year: 2017

Authors: Zanotto S., Bianco F., Miseikis V., Convertino D., Coletti C., Tredicucci A.

Autors Affiliation: CNR, Ist Nazl Ott, Via Nello Carrara 1, I-50019 Florence, Italy; LENS, Via Nello Carrara 1, I-50019 Florence, Italy; CNR, Ist Nanosci, NEST, Pza S Silvestro 12, I-56127 Pisa, Italy; Scuola Normale Super Pisa, Pza S Silvestro 12, I-56127 Pisa, Italy; Ist Italiano Tecnol, Ctr Nanotechnol Innovat NEST, Pza S Silvestro 12, I-56127 Pisa, Italy; Univ Pisa, Dipartimento Fis E Fermi, Largo Pontecorvo 3, I-56127 Pisa, Italy; FBK, Via Sommarive 18, I-38123 Povo, Trento, Italy.

Abstract: Analytical formulas are derived describing the coherent absorption of light from a realistic multilayer structure composed by an optically conducting surface on a supporting substrate. The model predicts two fundamental results. First, the absorption regime named coherent perfect transparency theoretically can always be reached. Second, the optical conductance of the surface can be extrapolated from absorption experimental data even when the substrate thickness is unknown. The theoretical predictions are experimentally verified by analyzing a multilayer graphene structure grown on a silicon carbide substrate. The graphene thickness estimated through the coherent absorption technique resulted in good agreement with the values obtained by two other spectroscopic techniques. Thanks to the high spatial resolution that can be reached and high sensitivity to the probed structure thickness, coherent absorption spectroscopy represents an accurate and non-destructive diagnostic method for the spatial mapping of the optical properties of two-dimensional materials and of metasurfaces on a wafer scale. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Journal/Review: APL PHOTONICS

Volume: 2 (1)      Pages from: 16101-1  to: 16101-8

More Information: The work was partially supported by PRA_2015_0080 of Universita di Pisa and by the European Union Seventh Framework Programme under Grant Agreement No. 604391 Graphene Flagship. Support from Lorenzo Pattelli and Giacomo Mazzamuto about symbolic mathematic solvers is kindly acknowledged.
KeyWords: Multilayer Graphene; Broad-band
DOI: 10.1063/1.4967802

Citations: 21
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