Study of terahertz spoof surface plasmons on subwavelength gratings with dielectric substance in grooves

Terahertz (THz) plasmonic devises based on periodical corrugated structures are promising for sensing applications in biology and medicine but have not been developed so far because spoof surface plasmons (SSPs) on such structures were studied insufficiently in the THz spectral range. In the paper, the propagation of THz SSPs along one-dimensional subwavelength rectangular plane gratings with a dielectric substance in the grooves was studied and optimal parameters of gratings (period, aspect ratio and groove depth) for sensing of dielectric were found. First grating samples were made and tested using the THz radiation of the Novosibirsk free electron laser.The investigations were supported by the Russian Science Foundation (grant No. 14-50-00080) and Russian Foundation for Basic Research (grant No. 16-32-00678). The Siberian Synchrotron and Terahertz Radiation Center equipment and free electron laser were employed in the experiments

Liga method of forming high-contrast collimators and anti-scatter grids with high aspect ratio

The article deals with creation and application of high-contrast anti-scatter X-ray grids for X-ray imaging in the range of 20–200 keV from microfocus X-ray tubes. A prototype high-aspect-ratio nickel grid structure is used to consider the impact of anti-scatter grid on the directional patterns of the IMA-2-150D X-ray tube. The suppression of scattered radiation and narrowing of the directional radiation pattern are demonstrated. The contrast of the nickel prototype is apparently insuffi cient. The article presents LIGA methods for manufacturing anti-scatter X-ray grids made of gold in Siberian Synchrotron and Terahertz Radiation Centre. A method for forming resistive grid structures using deep X-ray lithography is described and test structures are shown. The development of manufacturing technology for anti-scatter X-ray grids is in progress

Terahertz localized surface plasmons on subwave metal structures

Возбуждение мультипольных локализованных поверхностных резонансов (ППР) на субволновых структурах может значительно расширить возможности применения плазмонных биосенсоров. В работе с помощью численного моделирования проведено исследование ППР на гофрированных металлических дисках в соединении с С-образным резонатором в инфракрасном и терагерцовом диапазонах. Найдены параметры структур, при которых возбуждаются мультипольные резонансы. Порядок и интенсивность резонанса зависят от величины диэлектрической проницаемости металла. Excitation of multipole localized surface plasmon resonances (SPR) can greatly expand the potential of application of plasmonic biosensors. In the paper we studied the SPR on corrugated metal disks in conjunction with a C-shaped resonator in the infrared and terahertz ranges using numerical simulations. The parameters of the structures for which multipole resonances are excited were found. The order and intensity of the resonances depends on the dielectric permittivity of the metal.Работа выполнена при поддержке гранта РНФ (No 14-50-00080, а также с использованием оборудования Новосибирского ЦКП ЦСТИ