Atomic Carbon Spraying: Direct Growth of Graphene on Customized 3D Surfaces of Ultrafast Optical Devices (Front Cover Paper)
- Atomic Carbon Spraying: Direct Growth of Graphene on Customized 3D Surfaces of Ultrafast Optical Devices (Front Cover Paper)
- 송용원; 시암 우딘
- Atomic carbon spraying; 3D graphene; Ultrafast optical switch; Ultrafast laser pulse; optical nonlinearity
- Issue Date
- Advanced optical materials
- VOL 8, NO 12-1902091-11
- Despite the long-standing efforts to develop 3D graphene, which is critical for practical electronic, optoelectronic, and optical devices, the lack of synthetic methods and the use of conventional transfer approaches have limited its realization. Herein, a metal-free, etching-free, transfer-free, direct synthesis of functional graphene is introduced that contours 3D-structured surfaces of nonlinear optical devices, thereby maximizing the nonlinear interaction of graphene with guided light. Central to this method is the use of γ-Al2O3, a ceramic catalyst, which generates carbon atoms from the precursor molecules and supplies them for the graphene synthesis on the 3D structures located near the catalyst through spatial diffusion, described as atomic
carbon spraying (ACS). The optical nonlinearity facilitated by ACS-processed 3D graphene is experimentally verified by realizing both passively modelocked laser with a pulse width of 770 fs and ultrafast optical switching with 67% enhancement in nonlinear effect over 6 mm interaction length.
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