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Nonlinear photo-oxidation and femtosecond FWM imaging of graphene

HT-07

Nonlinear photo-oxidation and femtosecond FWM imaging of graphene


J. Aumanen1*, A. Johansson2, J. Koivistoinen1, P. Myllyperkiö1, M. Pettersson1

1Nanoscience Center, Department of Chemistry, University of Jyväskylä, Finland

2Nanoscience Center, Department of Physics, University of Jyväskylä, Finland

We have developed a method for tuning the electrical and optical properties of graphene by using femtosecond laser pulses [1]. Ultrathin, durable, flexible, transparent graphene is promising material for applications in electronics, photonics and optoelectronics. Focusing a femtosecond laser beam to graphene in ambient air induces non-linear photo-oxidation that locally changes the properties of graphene. By choosing the proper laser pulse parameters oxidation can be achieved without ablation or cutting of graphene. Femtosecond four wave mixing (FWM) microscopy is an efficient tool for imaging the oxidized patterns. FWM signal is very strong even from single layer graphene and the oxidized patterns can be distinguished from pristine graphene with excellent contrast. Local modification of graphene properties by direct laser writing provides a new all-optical method to develop all-graphene electronic and optoelectronic devices. Similar photo-oxidation effect has been observed also for suspended carbon nanotubes [2].

Femtosecond laser pulses induce local oxidation of graphene [1].

Femtosecond laser pulses induce local oxidation of graphene [1].

References:

[1] J. Aumanen, A. Johansson, J. Koivistoinen, P. Myllyperkiö and M.. Pettersson, Nanoscale 7, 2851 (2015).

[2] J. Aumanen, A. Johansson, O. Herranen, P. Myllyperkiö and M.. Pettersson, PCCP 17, 209 (2015).