Multilayer graphene refractive index tuning by optical power<xref rid="cpb_27_12_126304fn1" ref-type="fn">*</xref> <fn id="cpb_27_12_126304fn1"> <label>*</label> <p>Project supported by the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2009AM017 and ZR2013FM019), the National Postdoctoral Project of China (Grant Nos. 200902574 and 20080441150), the Fund from the Educational Department of Shandong Province, China (Grant No. J06P14), and the Opening Foundation of State Key Laboratory of Minning Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology of China (Grant No. MDPC201602).</p> </fn>

Multilayer graphene refractive index tuning by optical power* *

Project supported by the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2009AM017 and ZR2013FM019), the National Postdoctoral Project of China (Grant Nos. 200902574 and 20080441150), the Fund from the Educational Department of Shandong Province, China (Grant No. J06P14), and the Opening Foundation of State Key Laboratory of Minning Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology of China (Grant No. MDPC201602).

Li Lijun^{1, 2, 3, †}, Liu Yilin¹, Liu Yinming⁴, Xu Lin¹, Yu Fei¹, Xu Tianzong³, Shi Zhihui¹, Jia Weikang¹

(color online) Linearly fitting curves of graphene coating eFBG reflection Bragg wavelength versus light power increase and decrease, respectively.