name: Управление ближним электромагнитным полем в резонансных наноструктурах золото-кремний
keyword_list: electromagnetic near-field control, resonant, gold-silicon nanoantenna, Purcell factor, second harmonic generation, localized surface plasmon resonance, scanning near-field optical microscope
abstract: The goal of the dissertation work is the development of new methods of near-field control in resonant gold-silicon nanoparticles. 
  To achieve this goal the following tasks have to be solved:1, investigate the influence of the distance between the metal and dielectric components of the gold-silicon nanoantenna on the electromagnetic field distribution in the near-field region; 2, explore the second harmonic generation effect in a gold-silicon nanoantenna, in which metal and dielectric components are located at a distance from each other; 3, analyze the dependence of the electromagnetic near-field distribution in the gold-silicon nanoantenna and its far-field optical properties on the metal component shape; 4, study the process of the electromagnetic near-field control in groups of gold-silicon nanoantennas through modification of their metal component shapes. 
  The corresponding results are as follows: 1, it is shown that the electric field enhancement as high as 12 is achieved for a 10 nm gap between the gold sphere and silicon cone in a gold-silicon nanoantenna under TM-polarized excitation. It is demonstrated the Purcell factor for a point dipole source located in a diamond nanosphere with diameter of 10 nm placed in the gap reaches the values of 10^3 for the horizontal and 6.3 × 10^3 for its vertical orientation. The gap increases from 10 nm to 45 nm results in the exponential decay of electric field enhancement and Purcell factor; 2, it is demonstrated that in a resonant gold-silicon nanoparticle formed under the femtosecond laser irradiation of a silicon truncated nanocone, the top of which is covered with a thin film of gold with an adhesion chromium sublayer, the dependence of the second harmonic generation signal on the incident radiation power demonstrates a non-quadratic character due to the combination of the amplification of the optical and static electric fields, and is also two orders of magnitude higher than the intensity of the second harmonic signal obtained from a silicon nanocone without a gold nanoparticle; 3, it was found that a transformation of the gold nanoparticle shape from a disk to a sphere in a gold-silicon nanoantenna, where the silicon component represents a truncated nanocone, leads to a change of the contribution to the nanoantenna scattering by its metal and dielectric components, rearrangement of the distribution of the electromagnetic near-field, as well as the shift of the maximum amplification  band of the electromagnetic near-field to the short wavelength range; 4, it is shown that femtosecond laser action on heptamers consisting of gold-silicon nanoantennas leads to the shape modification of the gold components of the nanoantennas, which causes a shift in the scattering spectra of heptamers to the long wavelengths region, determined by the spectral shift of the magnetic dipole resonance of the heptamer, as well as a change in the spatial position of local maxima and increase of the electric field, which is recorded by the scanning near-field optical microscopy method using an aperture-type fiber probe.
chairman_dissertation_council.name: Николай
chairman_dissertation_council.surname: Никоноров
chairman_dissertation_council.patronymic: Валентинович
chairman_dissertation_council.position: профессор (квалификационная категория "ведущий профессор"), факультет фотоники
chairman_dissertation_council.degree: Доктор физико-математических наук
chairman_dissertation_council.rank: Профессор
chairman_dissertation_council.wos_research_id: 7003772604
chairman_dissertation_council.scopus_author_id: 7003772604
chairman_dissertation_council.territory: РОССИЯ
organization_supervisor.name: Владимир
organization_supervisor.surname: Васильев
organization_supervisor.patronymic: Николаевич
organization_supervisor.position: ректор
organization_supervisor.territory: РОССИЯ
rubrics.code: 29.31.01
rubrics.name: Общие вопросы
rubrics.code: 29.19.22
rubrics.name: Физика наноструктур. Низкоразмерные структуры. Мезоскопические структуры
oecds.code: 02.10.NS
oecds.name: NANOSCIENCE & NANOTECHNOLOGY
oecds.code: 01.03.SY
oecds.name: OPTICS
oecds.code: 01.01.UR
oecds.name: PHYSICS, MATHEMATICAL
speciality_codes.name: Оптика
speciality_codes.code: 01.04.05
supervisors.fio: Зуев Д. А.
supervisors.scientific_degree: Кандидат физико-математических наук
supervisors.speciality_code: Оптика
supervisors.responsible_type: Научный руководитель
opponents.fio: Ли Тао
opponents.scientific_degree: Кандидат физико-математических наук
opponents.speciality_code: Оптика
opponents.responsible_type: Оппонент
opponents.fio: Шегай Т. О.
opponents.scientific_degree: Доктор физико-математических наук
opponents.speciality_code: Оптика
opponents.responsible_type: Оппонент
protection_organization.short_name: УНИВЕРСИТЕТ ИТМО; НИУ ИТМО; ИТМО
protection_organization.name: ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ АВТОНОМНОЕ ОБРАЗОВАТЕЛЬНОЕ УЧРЕЖДЕНИЕ ВЫСШЕГО ОБРАЗОВАНИЯ "НАЦИОНАЛЬНЫЙ ИССЛЕДОВАТЕЛЬСКИЙ УНИВЕРСИТЕТ ИТМО"
protection_organization.ogrn: 1027806868154
protection_organization.supervisor_name: ВЛАДИМИР
protection_organization.supervisor_surname: ВАСИЛЬЕВ
protection_organization.supervisor_patronymic: НИКОЛАЕВИЧ
protection_organization.organization_type: Организация
protection_organization.okogu: Министерство науки и высшего образования Российской Федерации
protection_organization.okopf: Федеральные государственные автономные учреждения
author_organization.short_name: УНИВЕРСИТЕТ ИТМО; НИУ ИТМО; ИТМО
author_organization.name: ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ АВТОНОМНОЕ ОБРАЗОВАТЕЛЬНОЕ УЧРЕЖДЕНИЕ ВЫСШЕГО ОБРАЗОВАНИЯ "НАЦИОНАЛЬНЫЙ ИССЛЕДОВАТЕЛЬСКИЙ УНИВЕРСИТЕТ ИТМО"
author_organization.ogrn: 1027806868154
author_organization.supervisor_name: ВЛАДИМИР
author_organization.supervisor_surname: ВАСИЛЬЕВ
author_organization.supervisor_patronymic: НИКОЛАЕВИЧ
author_organization.organization_type: Организация
author_organization.okogu: Министерство науки и высшего образования Российской Федерации
author_organization.okopf: Федеральные государственные автономные учреждения