A photonic nanojets (PNJs) is a highly confined light beam that focuses from the shadow side of microparticles. In this simulation work, we report the realization of a tunable PNJ, which is formed by an engineered two-layer dielectric microcylinder. The key parameters, maximum intensity, length of PNJ and full-width at half maximum (FWHM), of photonic nanojets (PNJs) are studied. Finite difference time-domain (FDTD) analysis shows that under 400nm illumination, a PNJ with a high quality factor of 145.78 is achieved. We find that the photonic nanojets can be tuned by changing the distance between two layers of dielectric microcylinder. Because of its simple structure and flexibility, it has potential applications in optical imaging, nanolithography, and nanoparticle manipulation.
A photonic nanojets (PNJs) is a highly confined light beam that focuses from the shadow side of microparticles. In this simulation work, we report the realization of a tunable PNJ, which is formed by an engineered two-layer dielectric microcylinder. The key parameters, maximum intensity, length of PNJ and full-width at half maximum (FWHM), of photonic nanojets (PNJs) are studied. Finite difference time-domain (FDTD) analysis shows that under 400nm illumination, a PNJ with a high quality factor of 145.78 is achieved. We find that the photonic nanojets can be tuned by changing the distance between two layers of dielectric microcylinder. Because of its simple structure and flexibility, it has potential applications in optical imaging, nanolithography, and nanoparticle manipulation.
KEYWORDS: Fiber lasers, Temperature metrology, Sensors, Temperature sensors, Structured optical fibers, Single mode fibers, Sensing systems, Photonics, Water
A single mode fiber-tapered multi-core fiber-single mode fiber (SMFTMCF-SMF) structure for the temperature measurement with fiber ring cavity laser at 2 μm band is proposed and demonstrated. The sensor consists of a tapered MCF spliced between two single-mode fibers. By tapering the MCF, the modal fields of the different multi-cores run out and then couple with each other. Experimental results show that the proposed laser works stably at the resonant wavelength of 1979.2 nm at ambient temperature. A sensitivity of -4 pm/°C was obtained with the temperature changing from 70°C to 35°C.
A non-invasive vital signs monitoring system based on fiber-optic interferometers using single mode fiber (SMF) is presented in this paper. The fiber-optic interferometers was formed by a dual biconical structure without splicing point.The experimental setup was designed to collect the vital signs data of user on bed for processing. With optimized algorithm, human being’s heart beat and respiration signals can be monitored in an contactless and non-invasive way. The experimental results on the measurements of breathing rate and heart rate agree well with the results obtained from medical equipment.
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