Room-temperature strong coupling between dipolar plasmon resonance in single gold nanorod and two-dimensional excitons in monolayer WSe<sub>2</sub><xref rid="cpb_27_9_096101fn1" ref-type="fn">*</xref><fn id="cpb_27_9_096101fn1"><label>*</label><p>Project supported by the National Natural Science Foundation of China (Grant Nos. 51290271 and 11474364), the National Basic Research Program of China (Grant Nos. 2013CB933601 and 2013YQ12034506), the Natural Science Funds for Distinguished Young Scholars of Guangdong Province, China (Grant No. 2014A030306017), the Pearl River S & T Nova Program of Guangzhou, China (Grant No. 201610010084), and the Guangdong Special Support Program, China.</p></fn>

Room-temperature strong coupling between dipolar plasmon resonance in single gold nanorod and two-dimensional excitons in monolayer WSe₂**

Project supported by the National Natural Science Foundation of China (Grant Nos. 51290271 and 11474364), the National Basic Research Program of China (Grant Nos. 2013CB933601 and 2013YQ12034506), the Natural Science Funds for Distinguished Young Scholars of Guangdong Province, China (Grant No. 2014A030306017), the Pearl River S & T Nova Program of Guangzhou, China (Grant No. 201610010084), and the Guangdong Special Support Program, China.

Wen Jinxiu^{1, 4}, Wang Hao^{1, 3}, Chen Huanjun^{1, 2, †}, Deng Shaozhi^{1, 2, ‡}, Xu Ningsheng^{1, 2}

Characterizations of the monolayer WSe₂ flake. (a) Optical image of the monolayer WSe₂ sample. (b) AFM image of the monolayer WSe₂ flake showing the thickness of ∼ 0.9 nm. (c) HRTEM image of the monolayer WSe₂ sample. Inset shows the corresponding SAED pattern, which shows a hexagonal crystalline structure. The red lines indicate the two adjacent crystalline planes. (d) Raman spectrum of the monolayer WSe₂ sample. (e), (f) Raman intensity and PL maximum mapping of the WSe₂ flake corresponding to panel (a), respectively. The Raman mapping is monitored between 200 cm⁻¹–300 cm⁻¹.