We investigate the optical response of graphene nanoribbons (GNRs) using the broadband nonlinear generation and detection capabilities of nanoscale junctions created at the LaAlO₃/SrTiO₃ interface. GNR nanoclusters measured to be as small as 1–2 GNRs in size are deposited on the LaAlO₃ surface with an atomic force microscope tip. Time-resolved nonlinear optical probes of GNR nanoclusters reveal a strong, gate-tunable second and third harmonic response, as well as strong extinction of visible to near-infrared light at distinct wavelengths, similar to previous reports with graphene.

中文翻译：

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石墨烯纳米带纳米团簇的栅极可调光学消光

我们使用在 LaAlO ₃ /SrTiO ₃界面处产生的纳米级结的宽带非线性生成和检测能力来研究石墨烯纳米带 (GNR) 的光学响应。用原子力显微镜尖端将 GNR 纳米团簇测量到小至 1-2 个 GNR 的大小，沉积在 LaAlO ₃表面上。GNR 纳米团簇的时间分辨非线性光学探针显示出强大的、门可调谐的二次和三次谐波响应，以及不同波长的可见光到近红外光的强烈消光，类似于先前关于石墨烯的报道。