najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2021-12-1-60-64najo-381Research ArticlePHYSICSФИЗИКАWeak polarization-optical responses of diluted magnetic nanofluid probed by laser radiation with polarization modulationСлабые поляризационно-оптические отклики разбавленной магнитной наножидкости при зондировании лазерным излучением с модуляцией поляризацииFofanovYa. A.FofanovYa. A.

26 Rizhsky ave., St. Petersburg, 190103, box 207

26 Rizhsky ave., St. Petersburg, 190103, box 207

PleshakovI. V.PleshakovI. V.

26 Politechnicheskaya str., St. Petersburg, 194021

26 Politechnicheskaya str., St. Petersburg, 194021

ivanple@yandex.ruProkof’evA. V.Prokof’evA. V.

26 Politechnicheskaya str., St. Petersburg, 194021

26 Politechnicheskaya str., St. Petersburg, 194021

BibikE. E.BibikE. E.

26 Moskovsky ave., 190013, St. Petersburg

26 Moskovsky ave., 190013, St. Petersburg

Institute for Analytical Instrumentation RASInstitute for Analytical Instrumentation RASIoffe InstituteIoffe InstituteSt. Petersburg State Institute of Technology (Technical University)St. Petersburg State Institute of Technology (Technical University)2021280720251216064Copyright © Fofanov Y.A., Pleshakov I.V., Prokof’ev A.V., Bibik E.E., 20252025Fofanov Y.A., Pleshakov I.V., Prokof’ev A.V., Bibik E.E.Fofanov Y.A., Pleshakov I.V., Prokof’ev A.V., Bibik E.E.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/381

A sensitive laser registration of weak polarization-optical responses was used for the investigations of dilute magnetic nanofluids. Criteria for weak and strong signals for probing of sample by laser radiation with deep modulation of polarization were considered. The magneto-optical responses of a kerosene-based fluid with magnetite nanoparticles were investigated over a wide (five orders of magnitude) range of concentrations. Weak polarization responses for this nanofluid were observed at record low volume concentrations of nanoparticles up to 10−7.

Для исследования разбавленных магнитных наножидкостей применялась чувствительная лазерная регистрация слабых поляризационно-оптических откликов. Рассмотрены критерии слабого и сильного сигналов при зондировании образца лазерным излучением с глубокой модуляцией поляризации. Исследованы магнитооптические отклики жидкости на основе керосина с наночастицами магнетита в широком (пять порядков) диапазоне концентраций. Слабые поляризационные отклики для этой наножидкости наблюдались при рекордно низких объемных концентрациях наночастиц до 10-7.

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The authors declare that there are no conflicts of interest present.