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Graphene-Incorporated Soft Capacitor for Mechanically-Adjustable Electro-Optic Modulators
摘要： In addition to ultra-high capacity and speed in data management, future communication networks require enhanced performance via system reconfigurability under limited resources. Extremely high-speed operation renders optical data managing devices as excellent candidates to hybridize with current electronic devices; however, they still need tunability for system reconfiguration in an integrated scheme. We demonstrate an efficient electro-optic (EO) modulator that is mechanically tunable on a multiple optical waveguide system functioned with a soft capacitor structure incorporating graphene and poly(methyl methacrylate) (PMMA). The flexible capacitor that generates optical signals by temporal light absorption depending on electrical signals can be mechanically detached and re-attached from and onto a rigid surface of the waveguide. It provides either the on or off state of the modulating operation, and enables switching of the working waveguides following the reconfigured data routes. Quality-controlled graphene mainly provides the EO operation, and PMMA plays an important role as both the flexible dielectric layer in the capacitor and the passivation layer for graphene protection. The modulation effects of the manually prepared graphene-PMMA capacitor mechanically adjusted onto a side-polished optical fiber (D-shaped fiber) are investigated in terms of the extinction ratio (ER) of the transmitting light and the operational bandwidth. We successfully display an ER of the modulator up to 19.8 dB with a voltage control ranging from -50 V to 50 V. Its stable operation is verified with a modulation speed up to 2.5 MHz.
关键词： electro-optic modulator,mechanical tuning,graphene,tunable modulator,soft material
更新于2025-11-28 14:24:03
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Mechanically tuned molybdenum dichalcogenides (MoS2 and MoSe2) dispersed supramolecular hydrogel scaffolds
摘要： An intriguing way of tuning the mechanical efficiency of a supramolecular hydrogel network (SHGel) has been achieved by dispersing MoS2 and MoSe2. Depending upon the nature of chalcogens, the rheological properties of molybdenum dichalcogenides dispersed supramolecular hydrogel are varied. According to the variation of rheological properties, the morphologies of diverse molybdenum dichalcogenides dispersed hydrogel networks are changed. MoS2 enhances the mechanical performances of a supramolecular hydrogel. The incorporation of MoSe2 nano-fillers in the MoS2 dispersed supramolecular hydrogel lowers the mechanical properties gradually compared to the dispersion of pure MoS2. The dispersion of pure MoSe2 exclusively lowers the mechanical efficiency of the supramolecular hydrogel resulting in a drastic alteration of the morphological pattern of MoSe2 nano-fillers dispersed hydrogel under ambient condition.
关键词： MoSe2,Mechanical tuning,MoS2,Hydrogel,Microstructure
更新于2025-09-23 15:21:21