Jiang Biqiang, Yin Guolu, Zhou Kaiming, Wang Changle, Gan Xuetao, Zhao Jianlin, Zhang Lin
Opt Lett. 2016 Dec 1;41(23):5450-5453. doi: 10.1364/OL.41.005450.
By exploiting the polarization-sensitive coupling effect of graphene with the optical mode, we investigate the polarization modulation properties of a hybrid waveguide of graphene-integrated excessively tilted fiber grating (Ex-TFG). The theoretical analysis and experimental results demonstrate that the real and imaginary parts of complex refractive index of few-layer graphene exhibit different effects on transverse electric (TE) and transverse magnetic (TM) cladding modes of the Ex-TFG, enabling stronger absorption in the TE mode and more wavelength shift in the TM mode. Furthermore, the surrounding refractive index can modulate the complex optical constant of graphene and then the polarization properties of the hybrid waveguide, such as resonant wavelength and peak intensity. Therefore, the unique polarization tuning property induced by the integration of the graphene layer with Ex-TFG may endow potential applications in all-in-one fiber modulators, fiber lasers, and biochemical sensors.
通过利用石墨烯与光学模式的偏振敏感耦合效应，我们研究了集成石墨烯的过度倾斜光纤光栅（Ex-TFG）混合波导的偏振调制特性。理论分析和实验结果表明，少层石墨烯复折射率的实部和虚部对Ex-TFG的横向电（TE）和横向磁（TM）包层模式表现出不同的影响，使得TE模式中的吸收更强，TM模式中的波长偏移更大。此外，周围折射率可以调制石墨烯的复光学常数，进而调制混合波导的偏振特性，如谐振波长和峰值强度。因此，石墨烯层与Ex-TFG集成所诱导的独特偏振调谐特性可能为一体化光纤调制器、光纤激光器和生化传感器带来潜在应用。
