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303 results on '"Geints, Yu. E."'

66. Talbot photolithography optimization with engineered hybrid metal-dielectric mask: High-contrast and highly-uniform Talbot stripes

Author

Geints, Yu. E., Minin, I. V., and Minin, O. V.

Subjects
J.2, 65Z05, Physics::Optics, FOS: Physical sciences, Physics::Atomic Physics, Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Physics - Optics, Optics (physics.optics), Electronic, Optical and Magnetic Materials
Abstract

Conventional projection Talbot lithography usually employs opaque (amplitude) or transparent (phase) masks for creating a periodic array of Fresnel diffraction fringes in the photosensitive substrate. For particular mask design the longitudinal periodicity of Talbot carpet can be avoided producing quasi uniform striped pattern (Talbot stripes). We propose a novel hybrid amplitude-phase mask which is engineered for obtaining extremely smooth Talbot stripes and simultaneously high lateral optical contrast and extreme spatial resolution better than a third of laser wavelength. By means of the numerical simulations, we demonstrate the robustness of produced striped diffraction patterns against mask design deviation and light incidence angle variations. The reproducibility of the Talbot stripes is reported also for 1D and 2D metal-dielectric projection masks., Comment: 18 pages, 8 figures

Published
2022
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85. Modeling spatially localized photonic nanojets from phase diffraction gratings.

Author

Geints, Yu. E. and Zemlyanov, A. A.

Subjects
*PHOTONICS research, *FINITE difference method, *DIFFRACTION gratings, *SCATTERING (Physics), *OPTICAL radiometry
Abstract

We investigated numerically the specific spatially localized intense optical structure, a photonic nanojet (PNJ), formed in the near-field scattering of optical radiation at phase diffraction gratings. The finite-difference time-domain technique was employed to study the PNJ key parameters (length, width, focal distance, and intensity) produced by diffraction gratings with the saw-tooth, rectangle, and hemispheric line profiles. Our analysis showed that each type of diffraction gratings produces a photonic jet with unique characteristics. Based on the numerical calculations, we demonstrate that the PNJ could be manipulated in a wide range through the variation of period, duty cycle, and shape of diffraction grating rulings. Published by AIP Publishing. [ABSTRACT FROM AUTHOR]

Published
2016
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87. Explosive boiling of water droplets irradiated with intense CO2-laser radiation: numerical experiments

Author

Geints, Yu. E., Zemlyanov, A.A., and Armstrong, R.L.

Subjects
Aerosols -- Research, Carbon dioxide lasers -- Research, Heating research -- Analysis, Meteorological optics -- Research, Astronomy, Physics
Abstract

The results of numerical calculations of water-droplet explosions initiated by intense C[O.sub.2]-laser radiation are presented. The theoretical model for thi process is based on the solution of the value of the thermal-boundary problem i an inhomogeneously heated droplet, including the kinetic equation describing vapor generation in a superheated liquid. The main characteristics of droplet explosions (e.g., degree of explosive evaporation and time of explosion) are calculated. It is established that these characteristics depend on the heating rate of the droplet and on its radius. The results point to the fact that two droplet-heating regimes can be distinguished - slow heating and rapid heating - based on the behavior of the explosive boiling process. This division represent the competition of real physical processes in an irradiated droplet and makes i possible to separate the basic, specific features of the explosion process.

Published
1994

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