Molybdenum disulfide (MoS2) has emerged as a versatile two-dimensional material platform for many optical and optoelectronic applications due to its layer-dependent band structure, which can be tuned from direct to indirect by increasing the number of layers. In this work, the integration of MoS2 layers onto a D-shaped side-polished optical fiber has been demonstrated using an inkjet printing technique. We show that MoS2 devices exhibit a strong wavelength dependent transmission spectrum, with a transmittance dip of ~ –50 dB, which can be tuned from near to the mid-infrared wavelength regions by varying the printing paths. Exposure of the MoS2 device to deionized water has revealed that the wavelength position of dip changes by more than 70 nm in response to the mode’s interaction with the liquid. These results indicate that inkjet-printed MoS2 devices could find applications for the development of environmental gas or humidity sensors.
Polycrystalline silicon germanium (SiGe) core fibers offer great potential as flexible nonlinear platforms. Compared to Si core fibers, the SiGe material offers higher nonlinear coefficients, extended mid-infrared wavelength coverage, and the possibility to tune the bandgap and index of refraction through varying the Ge concentration. Here SiGe core fibers with 10% Ge were fabricated using the molten core drawing method, followed by CO2 laser irradiation. The transmission properties of the fibers were subsequently improved further using a fiber tapering method, to tailor the core diameter and enhance the crystallinity. The resulting tapered SiGe fiber had linear losses of 2.17 dB cm-1 at 1.5 μm and 4 dB cm-1 at 2.5 μm, significantly lower than previous reports. Nonlinear characterization of the fibers reveals that the nonlinear coefficients are higher than standard Si core fibers, as expected due to the introduction of germanium. The significantly higher value of the nonlinear figure of merit calculated for the SiGe fiber for wavelengths above 2 μm indicates that this new fiber platform could find numerous applications in mid-infrared nonlinear photonics.
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