自由载流子吸收
材料科学
光电子学
超短脉冲
饱和吸收
吸收(声学)
光学
双光子吸收
载流子
非线性光学
光子学
兴奋剂
激光器
物理
波长
光纤激光器
复合材料
作者
Dipendranath Mandal,Megha Shrivastava,S. Sharma,Ajay K. Poonia,Sourav Marik,R. P. Singh,K. V. Adarsh
出处
期刊:ACS Applied Nano Materials
日期:2022-04-04
卷期号:5 (4): 5479-5486
被引量:7
标识
DOI:10.1021/acsanm.2c00471
摘要
ReS2, a layered transition metal dichalcogenide (TMD) with reduced crystal symmetry exhibiting unique anisotropic and layer-independent properties, holds great potential for optoelectronic and photonic applications. Despite a flurry of research activities in the third-order nonlinear optical response of TMDs, tuning those properties in a completely reversible manner in real time is a challenge and remains largely unexplored. Here, we experimentally demonstrate band edge carrier-induced sign reversal of the ultrafast third-order nonlinear optical response in few-layer (4–8) ReS2 nanoflakes. In particular, saturable absorption observed before hot carrier thermalization (<0.3 ps) is tuned to reverse saturable absorption (RSA) after the carrier thermalized (>0.6 ps) at the band edge and defects using a single-color pump–probe intensity scan (I-scan) technique. RSA in our experiment is due to the two-step two single-photon absorption of the long-lived (∼1000s of ps from our ultrafast transient absorption) carriers at the band edges and defects. Motivated by the results, a liquid cell-based high-performance few-layer ReS2 optical limiter is fabricated with a remarkable 0.1 GW/cm2 onset threshold and 0.64 limiting differential transmittance better than the other optical-limiting materials. These results offer a direction to manipulate the nonlinear optical response of materials which otherwise requires a large electric field, high intensity, or efficient charge transfer between donor and acceptor pairs.
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