Saturable absorption in graphene at 800-nm band

Shunbin Lu; Shuqing Chen; Zhiwei Zheng; Han Zhang; Chujun Zhao; Shuangchun Wen

doi:10.1117/12.999624

13 December 2012 Saturable absorption in graphene at 800-nm band

Shunbin Lu, Shuqing Chen, Zhiwei Zheng, Han Zhang, Chujun Zhao, Shuangchun Wen

Proceedings Volume 8555, Optoelectronic Devices and Integration IV; 855512 (2012) https://doi.org/10.1117/12.999624
Event: Photonics Asia, 2012, Beijing, China

Abstract

Graphene, due to its linear energy band structure and the Pauli blocking principle, exhibits broadband optical saturable absorption. We experimentally demonstrated the saturable absorption in graphene with different layers at 800 nm. By performing the balanced twin-detector method, we are able to characterize the nonlinear optical property of the as-fabricated different layer graphene samples. Under strong illumination, we find that absorption of graphene decreases with the increase of incident power, and by fitting the experiment data with theoretical model, the saturable intensity and the normalized modulation depth is measured to be 7.911 GW/cm² and 10.6% in 3 layers sample and 2.77 GW/cm² and 73.6% in monolayer sample, respectively. The experimental result shows that graphene may be a promising saturable absorber, with the potential laser photonics applications, such as laser mode locker or Q-switcher, at 800 nm band.

Citation Download Citation

Shunbin Lu, Shuqing Chen, Zhiwei Zheng, Han Zhang, Chujun Zhao, and Shuangchun Wen "Saturable absorption in graphene at 800-nm band", Proc. SPIE 8555, Optoelectronic Devices and Integration IV, 855512 (13 December 2012); https://doi.org/10.1117/12.999624

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