Garcia John Carlo, Wilson Ethan Alex, Aggarwal Dipesh, Rajashekhar Harshitha, Vrushabendrakumar Damini, Shankar Karthik
Department of Electrical and Computer Engineering, University of Alberta, 9211-116 St, Edmonton AB T6G 1H9, Canada.
Nanotechnology. 2024 Sep 12;35(48). doi: 10.1088/1361-6528/ad6a1f.
A key challenge in the field of plexcitonic quantum devices is the fabrication of solid-state, device-friendly plexcitonic nanostructures using inexpensive and scalable techniques. Lithography-free, bottom-up nanofabrication methods have remained relatively unexplored within the context of plexcitonic coupling. In this work, a plexcitonic system consisting of thermally dewetted plasmonic gold nanoislands (AuNI) coated with a thin film of J-aggregates was investigated. Control over nanoisland size and morphology allowed for a range of plasmon resonances with variable detuning from the exciton. The extinction spectra of the hybrid AuNI/J-aggregate films display clear splitting into upper and lower hybrid resonances, while the dispersion curve shows anti-crossing behavior with an estimated Rabi splitting of 180 eV at zero detuning. As a proof of concept for quantum sensing, the AuNI/J-aggregate hybrid was demonstrated to behave as a plexcitonic sensor for hydrochloric acid vapor analyte. This work highlights the possibility of using thermally dewetted nanoparticles as a platform for high-quality, tunable, cost-effective, and scalable plexcitonic nanostructures for sensing devices and beyond.
激子极化子量子器件领域的一个关键挑战是使用廉价且可扩展的技术制造固态、对器件友好的激子极化子纳米结构。在激子极化子耦合的背景下，无光刻的自下而上的纳米制造方法仍未得到充分探索。在这项工作中，研究了一种由涂有J聚集体薄膜的热去湿等离子体金纳米岛（AuNI）组成的激子极化子系统。对纳米岛尺寸和形态的控制允许产生一系列与激子具有可变失谐的等离子体共振。AuNI/J聚集体混合薄膜的消光光谱显示出明显分裂为上混合共振和下混合共振，而色散曲线显示出反交叉行为，在零失谐时估计拉比分裂为180 eV。作为量子传感概念验证，AuNI/J聚集体混合物被证明可作为用于盐酸蒸汽分析物的激子极化子传感器。这项工作突出了使用热去湿纳米颗粒作为用于传感设备及其他领域的高质量、可调谐、经济高效且可扩展的激子极化子纳米结构平台的可能性。
