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A high-quality-factor ultra-narrowband perfect metamaterial absorber based on monolayer molybdenum disulfide 下载免费PDF全文
Liying Jiang 《中国物理 B》2022,31(3):38101-038101
In order to significantly improve the absorption efficiency of monolayer molybdenum disulfide (M-MoS2), an ultra-narrowband M-MoS2 metamaterial absorber was obtained through theoretical analysis and numerical calculation using the finite difference time domain method. The physical mechanism can be better analyzed through critical coupling and guided mode resonance. Its absorption rate at λ = 806.41 nm is as high as 99.8%, which is more than 12 times that of bare M-MoS2. From the simulation results, adjusting the geometric parameters of the structure can control the resonant wavelength range of the M-MoS2. In addition, we also found that the maximum quality factor is 1256.8. The numerical result shows that the design provides new possibilities for ultra-narrowband M-MoS2 perfect absorbers in the near-infrared spectrum. The results of this work indicate that the designed structure has excellent prospects for application in wavelength-selective photoluminescence and photodetection. 相似文献
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Ultrafast pulse generation was demonstrated in thulium doped fiber laser mode locked by magnetron sputtering deposited Sb_2Te_3with the modulation depth,non-saturable loss,and saturable intensity of 38%,31.2%,and 3.3 MW/cm~2,respectively.Stable soliton pulses emitting at 1930.07 nm were obtained with pulse duration of 1.24 ps,a 3-dB spectral bandwidth of 3.87 nm,an average output power of 130 m W,and signal-to-noise ratio(SNR)of 84 dB.To our knowledge,this is the first demonstration of Sb_2Te_3-based SA in fiber lasers at 2-μm regime. 相似文献
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利用氧化石墨烯作为可饱和吸收体,在被动锁模全正常色散掺镱光纤激光器中研究了多脉冲的现象,在同一抽运功率不同偏振态下,实验获得了矩形脉冲谐波锁模、耗散孤子谐波锁模、准谐波锁模,脉冲峰值周期性调制,脉冲簇、脉冲束、混沌多重脉冲的多脉冲现象,插入激光腔内的2nm窄带滤波器具有限制增益带宽、对脉冲塑形、诱导多脉冲产生的作用,调节偏振控制器相当于改变腔内增益,是实现不同类型多脉冲现象的主要原因,本实验研究有利于加深对多脉冲动力学行为在正常色散区域氧化石墨烯锁模掺镱光纤激光器中的理解。 相似文献
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Broadband continuum generation in an irregularly multicore microstructured optical fiber 总被引:1,自引:0,他引:1
A broadband continuum generation is reported in a novel multicore microstructured optical fiber (MOF) where irregular air holes are randomly distributed in cladding. By launching ultrashort light pulses from a Ti:sapphire laser into a 190-mm-long fiber of this type, we have observed a group of continua generated from different cores, each with distinct color. 20-dB bandwidth of the broadest continuum is 1260 nm with an average power of 143 mW. The result confirms that the multicore MOF can be fabricated, with different dispersion profiles tailored for specific supercontinuum (SC) generation towards practical applications. 相似文献
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微纳光电子技术是目前发展迅速﹑研究活跃﹑应用性强的前沿交叉领域之一.人们利用亚波长尺度微纳结构对电磁波振幅﹑偏振﹑相位﹑角动量等进行调控,设计出多种功能性器件,例如:完美吸波器﹑反射镜/偏折器﹑光学相控阵天线﹑超材料/超表面器件﹑超透镜﹑轨道角动量(OAM)器件﹑光频率梳﹑片上激光器等.可用于微纳光电子器件设计和分析的理论包括微腔谐振﹑等效介质模理论,严格耦合波理论,传输线理论,导模共振﹑Mie谐振﹑Fano谐振等理论;用于微纳光电子器件结构设计和模拟仿真的方法有时域有限差分(FDTD),有限元(FEM)。 相似文献
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中红外波段覆盖重要的分子吸收区与多个大气透射窗口,该波段的超快激光器在多个领域具有广泛应用。基于光纤的中红外超快激光器近年来在激光发射与传输、超快脉冲产生与应用等方面发展迅速,为中红外波段超快激光开辟了新的研究手段与应用领域。综述了近十年来中红外超快光纤激光器的发展概况,介绍了近年来中红外波段的激光传输与增益手段。其中,重点回顾了近年来中红外超快脉冲产生技术的研究进展及其代表性工作,包括非线性偏振旋转、可饱和吸收体以及频移反馈锁模技术。此外,还介绍了中红外超快脉冲的压缩放大技术与超连续谱产生应用。最后讨论并总结了中红外超快光纤激光器面临的挑战与可能的发展方向。 相似文献