Title :
Optical nonlinearities of CVD fabricated graphene by z-scan technique
Author :
Pi Ling Huang ; Wan-Lin Chen ; Ta-Wei Peng ; Chao-Yung Yeh ; Wood-Hi Cheng
Author_Institution :
Dept. of Photonics, Nat. Sun Yat-sen Univ., Kaohsiung, Taiwan
Abstract :
Optical nonlinearities of single layer graphene were investigated by z-scan method with ps laser pulses at wavelength of 532 nm. In addition to saturable absorption, the inverse saturation absorption was also observed at a higher intensity level. The two-photon absorption coefficient ß and nonlinear refractive index n2 are obtained as 0.17 to 5.4 (105 cm/W) and 0.8 to 10 (cm2/GW) respectively, while the pulse intensity was at the range of 6.5 to 97.2 (GW/cm2).
Keywords :
absorption coefficients; chemical vapour deposition; graphene; high-speed optical techniques; optical fabrication; optical materials; optical saturable absorption; refractive index; two-photon processes; C; CVD; chemical vapor deposition; inverse saturation absorption; nonlinear refractive index; optical nonlinearities; pulse intensity; saturable absorption; single layer graphene; two-photon absorption coefficient; wavelength 532 nm; z-scan technique; Fiber nonlinear optics; Graphene; Measurement by laser beam; Optical fibers; Optical pulses; Optical refraction;
Conference_Titel :
Photonics Conference (IPC), 2014 IEEE
Conference_Location :
San Diego, CA
DOI :
10.1109/IPCon.2014.6995273
