Graphene, as two-dimensional material with many properties of the gate-voltage tunable Fermi-level and zero band gap, can be utilized for optical modulators by the integration with other material. In this work, an electro-optic modulator based on the fiber-surface waveguide and graphene capacitance has been proposed with the device length of 50 μm, featuring excellent controllable polarization modulation (polarization extinction ratio over 0.12 dB/μm), large modulation bandwidth of∼40 GHz @ hBN and∼25 GHz @ Al₂O₃, and energy consumption low to 11.5 pJ/bit for hBN and 4 pJ/bit for Al₂O₃. The polarization can be controlled by tuning the core radius from 130 nm for the TE polarized modulation with modulation efficiency over∼2.56 dB V⁻¹ (Al₂O₃) and∼1.15 dB V⁻¹ (hBN) to 170 nm for the TM polarized modulation efficiency up to∼3.03 dB V⁻¹ (Al₂O₃) and∼1.3 dB/V (hBN). This work not only promotes the development of future polarization modulation technology, but also paves the way toward multifunctional fiber devices and systems.

石墨烯作为具有许多栅极电压可调费米能级和零带隙特性的二维材料，可通过与其他材料集成而用于光学调制器。在这项工作中，基于所述纤维的表面波导和石墨烯电容的电光调制器已经提出了具有50的器件长度μ米，具有优秀的可控偏振调制（偏振消光比超过0.12分贝/ μ M），大的调制带宽of~40 GHz的@的hBN and~25 GHz的@的Al ₂ ö ₃，和能量消耗低到11.5 PJ /六方氮化硼对位和4 PJ /位为的Al ₂ ö ₃。通过将TE偏振调制的纤芯半径从130 nm调整为TM，调制效率在〜2.56 dB V ^-1（Al ₂ O ₃）和〜1.15 dB V ^-1（hBN）以上至TM的170 nm，可以控制极化极化调制效率高达〜3.03 dB V ^-1（Al ₂ O ₃）和〜1.3 dB / V（hBN）。这项工作不仅促进了未来偏振调制技术的发展，而且为多功能光纤设备和系统铺平了道路。