The article proposes a novel all fiber vector magnetic field sensor structure based on magnetic fluid (MF) and side-polished eccentric-core fiber structure. The basic connection structure of the sensor head consists of an eccentric-core fiber (ECF) fused in the middle of two single-mode fibers (SMFs). The eccentric-core fiber (ECF) was side-polished to destroy the circular symmetry of the fiber. We encapsulated magnetic fluid (MF) on the surface of optical fiber structure by using capillary and combine the anisotropic distribution characteristics of MF to achieve vector magnetic field sensing. The research results indicate that the fiber structure shows a magnetic field intensity sensitivity of -0.381 dB/mT within 44~62 mT, with a maximum direction sensitivity of 519 pm/°. The sensor proposed in this paper adopts all-fiber structure, which is simple to manufacture and small in size, and has potential application prospects in many fields.
We propose a fiber optical cell catapult that is bird beak-shaped fiber cone optical tweezers that trap cells, then push them to the fiber tip via the evanescent fields on the side surface of the fiber cone, and finally eject them in a particular direction. The intensity distribution of the light field and the optical force of the fiber catapult are calculated by the finite element method. Moreover, an experimental study of the fiber catapult is given using yeast cells.
This article proposes and demonstrates a kind of all fiber vector magnetic field sensor based on side-polished hollow-core fiber (SPHCF) coated with magnetic fluid. The magnetic field sensor is composed of a single mode fiber- SPHCF - single mode fiber structure coated with the magnetic fluid. Our designed sensor has good identification of magnetic field orientation. In the experiments, the maximum orientation sensitivity and the intensity sensitivity are 0.19dB/° and -769.05 pm/mT, respectively. Additionally, we found that the changes of the concentration of the magnetic fluid and the sidepolished depth will lead to the change of the higher-order modes involved in the interference as well as the sensitivity of the magnetic field sensor. The proposed vector magnetic field sensor has the advantages of all fiber, simple structure, cost-effective and easy to manufacture, and etc.
In this study, we propose a dual-band wide-range tunable terahertz absorber based on graphene and bulk Dirac semimetal (BDS), which consists of a patterned BDS array, dielectric material, continuous graphene layer, and gold mirror. Simulation results show that the absorption at 3.97 and 7.94 THz achieve almost 100%. By changing the Fermi energy of graphene and BDS, the resonance frequency can be tuned between 3.97 and 9.28 THz. In addition, we found that when the background refractive index changes, the absorption is almost the same. This feature will broaden its applications. Finally, the influence of structural parameters and incident angles on device performance is discussed. The proposed absorber may have potential applications in photoelectric sensors and other optoelectronic devices.
We demonstrate a simple multi-wavelength Brillouin-erbium fiber laser (MBEFL) with triple-Brillouin-frequency-shift spacing. The single-, double-, and triple-Brillouin-frequency spaced multilwavelentth generation of the MBEFL is investigated in this paper. The output of the MBEFL is optimized by adjusting the output power and wavelength of the Brillouin pump (BP) and the 980 nm pump power of the erbium-doped fiber amplifier (EDFA). In the experiments, when setting the BP power to 2.5 mw and the BP wavelength to 1530.33 nm and the 980 nm pump power of EDFA1 and EDFA2 to 286 mw, 330mw, respectively, up to 11 Brillouin stokes with triple-Brillouin-frequency-shift interval are generated. The output wavelength is tunable from 1529.55nm to 1561.01nm. The proposed multi-wavelength fiber laser has potential applications in the areas of space optical communication and optical communications and microwave signal source.
The plastic optical fiber (POF) with a multi-notched structure was used for liquid level measurement. The multi-notched structure was fabricated on the POFs by a die-press-print method. When the notched structure was immerged by the liquid, the transmitted light power of the POF probe could be changed. So, this can be used as a liquid level sensor. The influence of the structure parameters on the sensor performances was investigated experimentally. Experimental results show that the sensitivity can reach to 0.0457/mm with a resolution of 1 mm, and the sensor resolution is flexible. The sensor is simple structure and easy fabrication, and it is a low cost solution for the liquid level measurement.
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