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All-Optical Switching of Two Continuous Waves in Few Layer Bismuthene Based on Spatial Cross-Phase Modulation
ACS Photonics ( IF 7 ) Pub Date : 2017-11-03 00:00:00 , DOI: 10.1021/acsphotonics.7b00849
Lu Lu 1 , Wenhui Wang 1 , Leiming Wu 2 , Xiantao Jiang 1 , Yuanjiang Xiang 1 , Jianqing Li 2 , Dianyuan Fan 1 , Han Zhang 1
Affiliation  

Bismuthene, the last and heaviest group-VA elemental two-dimensional material, has received tremendous interests owing to its advantages in electronic-transport, semimetallic bonding, and intrinsic spin-orbit coupling. However, light–bismuthene interaction is relatively less investigated. Herein, sonochemical exfoliation approach had been employed to deliver a successful synthesis of few-layer bismuthene with an average thickness of ∼3 nm and a lateral size of ∼0.2 μm. The corresponding band structure from mono- to sextuple-layer had been therotically calculated and it was found that bismuthene possesses a thickness dependent energy gap from almost zero to 0.55 eV, suggesting that bismuthene may also find unique applications from terahertz, mid-infrared toward infrared regime. The nonlinear optical absorption and refraction parameters had been well characterized by laser Z-scan and spatial phase modulation measurement techniques, respectively. By taking advantage of its strong nonlinear refraction effect, all optical switching of two different laser beams based on spatial cross-phase modulation had been eventually realized. It is further found that a modulated signal light clearly observed as switch light is turned on. The achievement of all optical switching suggests that the bismuthene-based 2D material is indeed an excellent candidate for an all optical switcher. Particularly, the semimetallic and long-term stable property in few layer bismuthene make it as a promising nonlinear optical material for infrared and mid-infrared optoelectronics. Our work demonstrates a large potential of this new material for nonlinear photonics and this contribution may provide new photonics avenue toward bismuthene-based devices (such as broadband detector, nonlinear optical switcher, phase modulator, etc.).

中文翻译:

基于空间交叉相位调制的几层铋中的两个连续波全光切换

铋是最后一种也是最重的VA族元素二维材料,由于其在电子传输,半金属键合和固有自旋轨道耦合方面的优势而受到了广泛的关注。但是,光-铋相互作用的研究相对较少。在本文中,已经采用声化学剥离方法成功地合成了平均厚度约为3 nm,横向尺寸约为0.2μm的几层铋。从理论上计算了从单层到六层的相应能带结构,发现铋的能隙与厚度相关,几乎为零至0.55 eV,这表明铋也可能在太赫兹,中红外到红外中找到独特的应用。政权。分别通过激光Z扫描和空间相位调制测量技术已经很好地表征了非线性光学吸收和折射参数。利用其强大的非线性折射效应,最终实现了基于空间交叉相位调制的两种不同激光束的所有光学切换。进一步发现,在接通开关光时清楚地观察到调制信号光。全光切换的成就表明,基于铋的2D材料确实是全光切换器的极佳候选者。特别是,在很少的几层铋中,半金属和长期稳定的性能使其成为用于红外和中红外光电子学的有希望的非线性光学材料。
更新日期:2017-11-05
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