Nonlinear photoluminescence imaging of isotropic and liquid crystalline dispersions of graphene oxide

Abstract

We report a visible-range nonlinear photoluminescence (PL) from graphene oxide (GO) flakes excited by near-infrared femtosecond laser light. PL intensity has nonlinear dependence on the laser power, implying a multiphoton excitation process, and also strongly depends on a linear polarization orientation of excitation light, being at maximum when it is parallel to flakes. We show that PL can be used for a fully three-dimensional label-free imaging of isotropic, nematic, and lamellar liquid crystalline dispersions of GO flakes in water. This nonlinear PL is of interest for applications in direct label-free imaging of composite materials and study of orientational ordering in mesomorphic phases formed by these flakes, as well as in biomedical and sensing applications utilizing GO.

References in corpus (6)

• Graphene Photonics and Optoelectronics
• Intrinsic and Extrinsic Performance Limits of Graphene Devices on SiO2
• Ultrafast Photoluminescence from Graphene
• Multimodal nonlinear optical polarizing microscopy of long-range molecular order in liquid crystals
• Three dimensional optical manipulation and structural imaging of soft materials by use of laser tweezers and multimodal nonlinear microscopy
• CARS polarized microscopy of three-dimensional director structures in liquid crystals

Cited by in corpus (1)

• Three-dimensional patterning of solid microstructures through laser reduction of colloidal graphene oxide in liquid-crystalline dispersions