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Journals and Conferences
We have developed a very simple high-sensitivity fiber temperature sensor using multimode interference. The fabricated structure comprises a large-core multimode fiber (MMF) sandwiched between single-mode-fibers. The MMF is coated with silicone-elastomer, whose refractive index varies with temperature.
A new structure composed of silica optical fiber for hyperthermia is proposed and fabricated. Laser ablation and temperature monitoring are simultaneously performed using a wavelength division multiplexing technique with a single optical fiber. The fabricated device shows a very fine temperature resolution of 0.06 °C. Laser light of 1.48 μm… (More)
An ultra-high-sensitivity optical fiber temperature sensor has been developed by utilizing a multimode interference structure with phenyl rubber coated onto the multimode fiber. The large refractive index and strong temperature dependence yielded excellent sensor characteristics.
We deposited gold films on optical fiber surfaces and annealed them to analyze the absorbance in the visible and near infrared wavelength range. The corresponding relations between the absorption spectra and the structural images of the deposited gold were identified.
We fabricated a humidity sensor by connecting single-mode-multimode-single-mode fibers and coating the sensing part with sol-gel derived porous silica, achieving a high sensitivity (0.748 nm/% at 0.4% relative humidity) and quick response.
We design and characterize a two-dimensional sonic crystal (SC) to manipulate the propagation of acoustic waves by numerical simulation based on the finite-difference time-domain (FDTD) method and by ultrasonic measurement. Two types of SC for an acoustic lens effect are studied. One is a homogeneous periodic structure exhibiting negative refraction, and… (More)
A simple analytical calculation method providing convenient design criteria for the realization of high sensitivity temperature sensor is presented. Such an approach is applicable to any type of multimode interference (MMI) structure with different core/cladding compositions. A low-complexity optical-fiber temperature sensor, based on MMI using epoxy resin… (More)
This letter presents the experimental investigation to increase the sensitivity of an optical fiber refractive index sensor with a multimode interference (MMI) structure. It is confirmed that the interference wavelength can be set in the long-wavelength region by adjusting the sensing-part length. Moreover, it is shown that the fineness of the cores in the… (More)
We investigated a novel reflection technique for a reflection-type fiber-optic multimode interference structure. Rounding the fiber end-face increased the reflected light intensity by more than 10 dB, with no reflection coating. We demonstrated the use of our multimode interference structure as a temperature sensor by immersing the sensing region in… (More)