Giving to CREOL CREOL, The College of Optics & Photonics

Seminar: "Nonlinear Optical Frequency Conversion in 2D Materials" by Christiano J. S. de Matos

Thursday, February 1, 2018 11:00 AM to 12:00 PM
CREOL Room 103

Christiano J. S. de Matos
MackGraphe – Graphene and Nanomaterials Research Center
Mackenzie Presbyterian University


Christiano J. S. de Matos was born in Rio de Janeiro on 28 October, 1975. He holds bachelor and master degrees in Physics issued by Pontifícia Universidade Católica do Rio de Janeiro – PUC-Rio – (1998 and 1999) and a PhD issued by Imperial College London/University of London (2004). He was a visiting researcher at ACREO, Stockholm (1999), and a post-doctoral fellow in the Physics Department at Universidade Federal de Pernambuco – UFPE (2004/2005). He is currently a Professor at Universidade Presbiteriana Mackenzie, where he is one of the leaders of the Photonics Laboratory within MackGraphe and holds active international collaborations with world-class researchers.

Christiano’s work focus on nonlinear optics and nanophotonics in optical fibers and waveguides, for the development of sensors, specialty optical waveguides and photonic devices. His main contributions include a number of world’s first demonstrations such as a random laser in an optical fiber, a chirped pulse amplification system using a hollow-core photonic bandgap fiber, an all-fiber optical parametric oscillator using a photonic crystal fiber and a supercontinuum source using a water-core photonic crystal fiber. He has, so far, published over 50 articles in peer-reviewed journals, presented over 80 papers in conferences, and filed 2 patents. Christiano holds a CNPq productivity grant (level 2), has an h-factor = 16 (with over 600 citations) and was a New Focus/Bookham Student Award winner (Optical Society of America) in 2004. He is also a member of the editorial board of the international journal ISRN Optics (Hidawi Publishing Corporation).


Two-dimensional (2D) materials such as graphene, transition metal dichalcogenides and phosphorene are emerging as important components for application in a wide variety of areas, including materials and mechanical engineering, biomedicine, electronics, optoelectronics and photonics. In photonics, a promising, albeit still incipient, field is that of parametric nonlinear optics in 2D materials, within which frequency conversion phenomena such as second- and third-harmonic generation, as well as four-wave mixing, may play important roles in future all-optical signal processing. In addition to presenting high optical nonlinearities, 2D materials can easily be integrated to silicon-based photonic chips, in contrast to three-dimensional nonlinear materials. Even though four-wave mixing and third-harmonic generation have been measured in graphene and second-harmonic generation has been measured in transition metal dichalcogenides such as MoS2, the reported nonlinear susceptibilities vary significantly in the literature. Although the substrate’s influence and the experimental methods can partially explain the reported discrepancies, the application of bulk concepts and equations to surface-only materials also leads to considerable confusion. In this presentation, I will give an overview on the nonlinear optical experiments being carried out at MackGraphe and at collaborating institutions. The experimental results on second- and third-harmonic generation on MoS2 and on third-harmonic generation on few-layer phosphorene will be presented, in which the sheet nonlinear susceptibilities were quantified. In particular, we observe stronger frequency-tripled intensity than frequency-doubled intensity on MoS2 and a resonant enhancement of third-harmonic generation on phosphorene, which is attributed to processes involving excitons. Interestingly, both materials present a stronger third-harmonic generation than graphene.

For additional information:

Eric W. Van Stryland

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