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Laser & Photonics review: Broadband saturated absorption and transient absorption properties of graphene

wallpapers News 2020-10-08
Since the appearance of

two-dimensional materials have played an important role in modern photonics. Graphene is a new two-dimensional all carbon nano material developed after fullerene (0d 1985) carbon nanotubes (1D 1991) graphene (2D 2004). Because of its unique chemical structure electronic properties it is widely used in various fields such as electrocatalysis photoelectrochemical water splitting photocatalysis photodetectors supercapacitors lithium-ion batteries solar cells. However the application of graphene in the field of photonics is still in its infancy.

Fig. 1. Transient infrared absorption spectra of graphene. As nonlinear optical materials

graphene have broad prospects in the application of photonic devices. Firstly different from the zero b gap of graphene graphene has a tunable direct b gap which indicates that graphene has great potential in photonic devices based on optical switching function. In addition the abundant alkyne bonds subnanopores in the structure of graphene provide a large number of sites for its functionalization. In this case by controlling the type number of doped atoms (such as boron nitrogen phosphorus sulfur) the light gap of the original graphene can be adjusted in a wide wavelength range which makes it a more compatible optical material. In addition compared with unstable black phosphorus other two-dimensional materials graphene has good optical stability chemical stability has a very long service life at room temperature. The excellent stability of graphene can prevent its photooxidation photodegradation under strong light irradiation which is of great significance for the development of long-term photonic devices. Recently Professor Zhang Han's research group Xu Jialiang's research group have jointly proved that graphene has strong broadb Kerr nonlinearity large nonlinear refractive index (about 10-5cm2 W-1) by using the method of spatial self phase modulation which indicates that graphene can be widely used in multi-functional photonic devices (Kerr nonlinearity in 2D graph diyne for passive photonic diodes Advanced Materials 2019 31(14) 1807981)。 In view of this the research development of advanced multifunctional optoelectronic devices based on graphene is not only of great significance to fully underst the optical properties of all carbon graphene nanomaterials but also will promote the development of photonic devices based on two-dimensional materials.

Fig. 2. The infrared nonlinear optical response of graphene can be seen.

recently Zhang Han a distinguished professor of Shenzhen University cooperated with the research team of Nankai University Xu Jialiang to publish research papers on Laser & Photonics reviews a famous journal in the first optical district( DOI:10.1002/lpor.201900367 )It is the first time to study prove the broadb saturated absorption transient absorption characteristics of graphene from visible to infrared. It is found that compared with traditional two-dimensional materials graphene has stronger nonlinear absorption lower saturation strength ultrafast relaxation time which indicates that as a new two-dimensional material graphene can be widely used in optoelectronic devices such as lasers optical switches thresholders photodiodes all-optical modulators. By using graphene as saturable absorber in fiber laser high power mode-locked pulse output is achieved at 1 1.5 μ m respectively. This study reveals the excellent nonlinear optical properties of graphene lays a foundation for its development in advanced nano photonic devices. As a new star in all carbon nanomaterials graphene will shine in the whole field of photonics.

Fig. 3. Saturated absorption mechanism of graphene. The co first authors of this paper are Dr. Guo Jia Wang Rui of Shenzhen University Shi Rongchao of Nankai University. The corresponding authors are Professor Zhang Han Dr. Jiang Xiantao of the Joint Laboratory of two dimensional materials optoelectronic technology of Shenzhen University Professor Xu Jialiang of the school of materials science engineering of Nankai University. This work is supported by the National Natural Science Foundation of China the science technology development fund of Macao Special Administrative Region of China the Shenzhen Science technology innovation fund.

Fig. 4. The performance of graphene in ultrafast photonics applications.

Graphdiyne‐Polymer Nanocomposite as a Broadb Robust Saturable Absorber for Ultrafast Photonics

Jia Guo Rongchao Shi Rui Wang Yunzheng Wang Feng Zhang Cong Wang Hualong Chen Chunyang Ma Zhenhong Wang Yanqi Ge Yufeng Song Zhengqian Luo Dianyuan Fan Xiantao Jiang Jialiang Xu Han Zhang

https://doi.org/10.1002/lpor.201900367

Zhang Han distinguished professor of Shenzhen University director of Shenzhen black phosphorus engineering laboratory doctoral supervisor. Members of the Optical Society of America "Youqing" of the Foundation Committee "highly cited scientists (2018 / 2019)" of Kerui Weian "leading talents of science technology in Guangdong Province" etc. He has been engaged in the research of low dimensional material optoelectronic devices for a long time. He has published more than 100 papers in the first district of Chinese Academy of Sciences as corresponding authors including chemical society reviews coordination chemistry reviews physics reports PNAs science advances nature communications etc. the total number of citations is more than 26000 the h-index index index is 85. Professor Zhang Han is the chief editor / editor of several SCI journals Secretary General of China laser youth editorial board vice chairman of the second presidium of the national optical Youth Academic Forum. The scientific research achievements have won the second prize of Natural Science Award of the Ministry of education China industry university research cooperation innovation award China top ten progress in optics Guangdong Dingying science technology award Shenzhen Youth Science technology award Shenzhen Natural Science Award etc.

we are looking for outsting postdoctoral research fellows. Please send your resume to 947935449@qq.com 。 Requirements: in the fields of optics chemistry biology pharmacy other science engineering published 1-2 SCI papers under the age of 32 engaged in the research of biological optical properties of two-dimensional materials


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