A probe-type all-fiber ultraviolet photodetector is proposed in this paper. A ZnO microwire is fixed on the end facet of a single-mode fiber through a glass tube with specific diameter to form a Fabry-Pérot interferometer. With this all-fiber structure, fast-response ultraviolet detection can be realized in an all-optical scheme. Since the refractive index of ZnO microwire increases under the illumination of ultraviolet, interference wavelengths of abovementioned device redshifts with the increase of ultraviolet light intensity. By employing a continuous 266-nm laser beam and chopping method, the sensitivity is obtained to be 0.268 nm/(W·cm-2 ) and the response time is only 0.56 ms. To be more specifically, the response speed of the device is further explored by a 266-nm pulsed laser, and the response time of the device is measured to be only 13 μs. The proposed device provides a new idea for the next generation of high-performance ultraviolet photodetectors and may find potential applications in the future.
In this work, an all-fiber ultraviolet (UV) photodetector is proposed, where a ZnO micro-rod prepared by chemical vapor deposition is fixed on the end face of a fiber-tip and acts as a Fabry-Pérot interferometer (FPI). Under the irradiation of UV light, the photo-generated carriers change the refractive index of the ZnO micro-rod, resulting in a redshift of the interference wavelengths of the ZnO FPI. Through tracing the shift of a single interference peak, the relative intensity of UV light can be obtained. In order to improve the sensitivity of the device, a discontinuous Ag film with an island-like structure is coated on the surface of the ZnO micro-rod through magnetron sputtering, and therefore the sensitivity of the proposed device achieves a UV sensitivity up to 0.55 nm/(W·cm-2 ), which is 1.9 times higher than that of without Ag-decoration, due to the intensification of photo-carrier change with the help of the Schottky junction formed between Ag film and ZnO micro-rod. The demonstrated structure exhibits excellent stability and UV response and takes full advantage of optical fiber devices, which paves a new way for the next generation of UV photodetection applications.
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