Optical Fibers Embedded with As-Grown Carbon Nanotubes for Ultrahigh Nonlinear Optical Responses,Advanced Materials

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Optical Fibers Embedded with As-Grown Carbon Nanotubes for Ultrahigh Nonlinear Optical Responses
Advanced Materials ( IF 27.4 ) Pub Date : 2023-05-25 , DOI: 10.1002/adma.202303046
Qi Xiao _{1,

2} , Jin Xie ₃ , Guangjie Yao ₃ , Kaifeng Lin ₃ , Hao-Li Zhang ₂ , Liu Qian ₄ , Kaihui Liu ₃ , Jin Zhang _{1,

4}

Affiliation

Photonic crystal fiber (PCF) embedded with functional materials has demonstrated diverse applications ranging from ultrafast lasers, optical communication to chemical sensors. Many efforts have been made to fabricating carbon nanotube (CNT) based optical fibers by ex situ transfer method; however, often suffer poor uniformity and coverage. Here, the direct growth of CNTs on the inner walls of PCFs by the chemical vapor deposition (CVD) method is reported. A two-step growth method is developed to control the narrow diameter distribution of CNTs to ensure desirable nanotube optical transitions. In the as-fabricated CNT- embedded fiber, third-harmonic generation (THG) has been enhanced by ≈15 times compared with flat CNT film on fused silica. A dual-wavelength all-fiber mode-locked ultrafast laser (≈1561 and ≈1064 nm) is further demonstrated by integrating the 1.36±0.15 nm-diameter CNTs into two kinds of photonic bandgap hollow core PCF (named HC-1550 and HC-1060) as saturable absorbers, using their S₁₁ (≈0.7 eV) and S₂₂ (≈1.2 eV) interband transition respectively. The fiber laser shows stable output of ≈10 mW, ≈800 fs pulse width, and ≈71 MHz repetition rate at 1561 nm wavelength. These results can enable the large-scale applications of CNTs in PCF-based optical devices.

中文翻译：

嵌入生长碳纳米管的光纤可实现超高非线性光学响应

嵌入功能材料的光子晶体光纤（PCF）已展示出从超快激光器、光通信到化学传感器的多种应用。人们在通过异位转移法制造碳纳米管（CNT）基光纤方面做出了许多努力；然而，其均匀性和覆盖范围往往较差。在此，报道了通过化学气相沉积（CVD）方法在 PCF 内壁上直接生长 CNT。开发了一种两步生长方法来控制碳纳米管的窄直径分布，以确保理想的纳米管光学跃迁。在制成的嵌入 CNT 的光纤中，三次谐波产生 (THG) 与熔融石英上的平坦 CNT 薄膜相比增强了约 15 倍。通过将直径为 1.36±0.15 nm 的 CNT 集成到两种光子带隙空心 PCF（名为 HC-1550 和 HC-1550）中，进一步证明了双波长全光纤锁模超快激光器（≈1561 和 ≈1064 nm）。 1060）作为可饱和吸收体，分别使用其 S ₁₁（约 0.7 eV）和 S ₂₂（约 1.2 eV）带间跃迁。光纤激光器在 1561 nm 波长下表现出稳定的输出，约为 10 mW、约 800 fs 脉冲宽度和约 71 MHz 重复率。这些结果可以使碳纳米管在基于PCF的光学器件中大规模应用。

更新日期：2023-05-25

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