Hexagonal Boron Nitride As an Ideal Substrate for Carbon Nanotube Photonics,ACS Photonics

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Hexagonal Boron Nitride As an Ideal Substrate for Carbon Nanotube Photonics
ACS Photonics ( IF 6.5 ) Pub Date : 2020-06-02 , DOI: 10.1021/acsphotonics.0c00406
N. Fang _{1,

2} , K. Otsuka ₁ , A. Ishii _{1,

2} , T. Taniguchi ₃ , K. Watanabe ₃ , K. Nagashio ₄ , Y. K. Kato _{1,

2}

Affiliation

Hexagonal boron nitride is widely used as a substrate for two-dimensional materials in both electronic and photonic devices. Here, we demonstrate that two-dimensional hexagonal boron nitride is also an ideal substrate for one-dimensional single-walled carbon nanotubes. Nanotubes directly attached to hexagonal boron nitride show bright photoluminescence with narrow line width at room temperature, comparable to air-suspended nanotubes. Using photoluminescence excitation spectroscopy, we unambiguously assign the chiralities of nanotubes on boron nitride by tracking individual tubes before and after contact with boron nitride. Although hexagonal boron nitride has a low dielectric constant and is attached to only one side of the nanotubes, we observe that optical transition energies are red-shifted as much as ∼50 meV from the air-suspended nanotubes. We also perform statistical measurements on more than 400 tubes, and the redshifts are found to be dependent on tube diameter. This work opens up new possibilities for all-solid-state carbon nanotube photonic devices by utilizing hexagonal boron nitride substrates.

中文翻译：

六方氮化硼作为碳纳米管光子学的理想基底

六方氮化硼被广泛用作电子和光子器件中二维材料的衬底。在这里，我们证明了二维六方氮化硼也是一维单壁碳纳米管的理想衬底。与空气悬浮的纳米管相比，直接附着在六方氮化硼上的纳米管在室温下显示出明亮的光致发光且线宽较窄。使用光致发光激发光谱，我们通过跟踪与氮化硼接触之前和之后的各个管，明确分配了氮化硼上纳米管的手性。尽管六方氮化硼的介电常数很低，并且仅附着在纳米管的一侧，但我们观察到，光学跃迁能从空气悬浮的纳米管中转移了约50 meV的红移。我们还对400多个试管进行了统计测量，发现红移取决于试管直径。通过利用六方氮化硼衬底，这项工作为全固态碳纳米管光子器件开辟了新的可能性。

更新日期：2020-07-15

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