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The presence of internal inhomogeneities of the refractive index n inDOM to a maximum of Δn = 3 10-3 and a diameter to a maximum of 10 μm doesnot affect its Q-factor;73. The use of a fiber with a long parabolic overstretching providesmaximum sensitivity of the nanoparticles sensor due to the high Q-factor of DOMnot worse than 1×109±20%;4. The sensor based on DOM allows to detect TiO2 particles with anintegral number concentration to a maximum of 1,55*105±0,12*105 U / cm3;5. To use DOM as a sensor of silver nanoparticles in a liquid medium, it isnecessary to keep the resonators in distilled water for at least 60 minutes undernormal conditions.Scientific novelty1. The procedure of manufacturing DOM from optical fiber and allowing toreproduce the geometrical dimensions of DOM with an accuracy of 10% with a Qfactor not less than 1×109±20% is developed;2.
For the first time in the world the index profile at the DOM center wasobtained by means of optical tomography. It is shown that the presence ofinhomogeneities of the refraction index Δn=3 10-3 and a diameter of not morethan 10 μm does not reduce the Q-factor less than 1×109±20% and does not affectits Q factor;3. The procedure for fabricating a sublong-wavelenght optical fiber forcommunication with DOM having a special form of overstretching which allows tomeasure the Q factor up to 109;4. The possibility of detecting small concentrations of TiO2 aerosolnanoparticles up to (1,55±0,12)×105 unit/cm3 in air medium using DOM has beenexperimentally demonstrated. It is shown that as a result of activation by hightemperature heating of siloxane bonds in polycrystalline quartz, adhesion oftitanium dioxide nanoparticles to the DOM surface in the air medium occurs,which makes it possible to detect single nanoparticles of titanium dioxide;5.
The procedure for activation of siloxane bonds by interaction of theresonator surface with hydroxyl ions for at least 60 minutes is developed whichensures the adsorption of silver nanoparticles in a liquid medium.8General conclusions1. It is shown that the circular heating of the optical fiber allows thecreation of optical resonators with reproducible metrological characteristics.Practical significance is confirmed by the act of implementation;2. It is shown that the internal inhomogeneities of DOM refractive indexdo not affect its metrological characteristics;3.
Developed procedure allows fabricating sublong-wavelength fiber withworking length range from 3 to 15 mm provides a seamless transition betweendiameters, value of transmission coefficient is not less than 98.5%. The resultingfiber geometry possesses the necessary rigidity allowing to minimize the effect ofthe electric charge accumulated on the coupling elements of waveguide-resonator,thereby allowing a stable connection with the DOM. The scientific novelty isconfirmed by the patent No.
52645040 and the registration of software No.2016618965.4. The manufacturing of sub long wave fiber with a parabolic form ofstretching allows one to provide a connection with DOM, obtained by thermal andmechanical methods for the development of highly sensitive nanoparticle sensors.5. Developed procedure of activation of DOM surface allows measuringthe concentration of silver nanoparticles in fluid medium at a concentration of 0.05ppm and higher;6. It is shown that for the implying of sensors based on DOM for thedetection of silver nanoparticles in water medium at a concentration of 0.05 ppmand above, hydroxylation of DOM in distilled at least 60 minutes water must beperformed.9List of publications1.
Ivanov A.D., Min’kov K.N., Samoilenko A.A. Method of producing taperedoptical fiber // Journal of Optical Technology. 2017, Vol. 84, Issue 7, pp.500-503, Scopus, Q2.2. Samoilenko A.A., Levin G.G., Lyaskovskii V.L., Min’kov K.N., Ivanov A.D.,Bilenko I.A. Application of Whispering-Gallery-Mode Optical Microcavitiesfor Detection of Silver Nanoparticles in an Aqueous Medium // Optics andSpectroscopy. 2017, Vol. 122, № 6, pp.
1002–1004, Scopus, Q3.3. Ruzhitskaya D.D., Samoilenko A.A., Ivanov A.D., Min’kov K.N. Analysisof the Transmission Spectra of Optical Microcavities Using the ModeBroadeningMethod//Optoelectronics,InstrumentationandDataProcessing. 2018, Vol.54, № 1, pp. 61-68, Scopus, Q4.4. Min’kov K.N., Ivanov A.D., Samoilenko A.A., Ruzhitskaya D.D., LevinG.G., Efimov A.A. Measurement of Low Concentrations of Nanoparticles inAerosols Using Optical Dielectric Microcavity: The Case of TiO2Nanoparticles // Nanotechnologies in Russia.
2018, Vol 13, № 1-2, pp. 3844, Scopus, Q2..
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