Kim, Won-Jun Chang, You Min Lee, Junsu Kang, Dongseok Lee, Ju Han Song, Yong-Won 2024-01-20T14:32:53Z 2024-01-20T14:32:53Z 2021-09-05 2012-06-08 0957-4484 https://pubs.kist.re.kr/handle/201004/129150 We propose a novel photonic application as well as an optical tool to verify the crystallinity of interface-grown graphene demonstrating passive mode-locked lasers. The interface growth process enables the formation of multi-layered graphene at an interface of substrate and catalyst, therefore directly onto the targeted substrate without a transfer process. The synthesized graphene is characterized using Raman spectroscopy and x-ray photoelectron spectroscopy before ultrashort pulse formation to confirm the validity of the process for high-speed photonic applications of graphene. The resultant pulses have a repetition rate, pulse duration, RF extinction ratio of 14.01 MHz, 1.0 ps, and similar to 35 dB, respectively. English IOP PUBLISHING LTD CARBON NANOTUBES LAYER GRAPHENE PULSED LASERS Ultrafast optical nonlinearity of multi-layered graphene synthesized by the interface growth process Article 10.1088/0957-4484/23/22/225706 1 NANOTECHNOLOGY, v.23, no.22 NANOTECHNOLOGY 23 22 scie scopus 000305160300019 2-s2.0-84861078275 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article CARBON NANOTUBES LAYER GRAPHENE PULSED LASERS graphene nonlinearity optical fiber mode-locked laser saturable absorber