Fig. 6: Designing of multiple-nanomembranes on microfibers for functional photonic and photoelectronic devices.

a Schematic of the long-period fiber grating by using periodic nanomembranes (NMs) wrapped on microfiber (MF). Inset shows the part of periodic NMs on MF. Scale bar, 10 μm. b The performance of long-period fiber grating with different periodic NMs arrays. Both devices with 10-period and 20-period metal NMs can select the wavelength. c The simulation of fiber grating used the same parameters as the experiments. d The photodetector device based on Te/Si NM wrapped on MF triggered by the laser out of the MF. Top, the schematics of the photodetector device and the light is illuminated out of the fibers. Bottom, the optical image of the device. Scale bar, 100 μm. e The current–voltage performance of the photodetector. f Response time of the photodetector. g Fabrication of the photodetector triggered by the laser in the MF. Top, the schematics of the photodetector by using the evanescent field along the fiber. Bottom, the optical image of the device. h The current–voltage performance of the evanescent field photodetector. i Photovoltage changes with increased laser power in the fiber. Inset shows frequency response performance of the evanescent field photodetector.