Fig. 5: On-fiber optical devices based on nanomembrane-wrapped microfiber structures.
a Schematics of the VO2 nanomembrane (NM) wrapped on microfiber (MF) structures for temperature sensors. The inset shows the SEM of the conformal structure. Scale bar, 10 μm. b Performances of the temperature sensor fabricated by VO2 NM and MF. The light intensity in the fiber changed when measured at different temperatures. The purple shadow shows the hysteresis phenomenon during the heating and cooling progress. c The detailed analysis of the temperature dependence of light power, as presented in (b). d The light modulator composed of MKR and metal NMs. Top, the schematic of modulator structures. Bottom, the optical images of modulator devices when illuminated. The inset shows the NM-wrapped MKR. Scale bar, 100 μm. e The modulator performances. With increased temperature, the wavelength of the peak is modulated. f The comparison between the MKR modulators with NMs and without NMs. g Design of NM-on-MF-based composite resonator. Scale bar: 20 μm. h Controllable switching characteristics of the composite resonator. i Flexible assembly of the composite structure. Scale bar: 50 μm.
