Multiview 3D display system consisting of mobile phone screen and optical screen consisting of microlens array film is designed. 3D image files are created and images are demonstrated based on different smartphones with high resolution displays.
Splitting of the incident laser beam into multiple beams (spots) is investigated. Evolution of a beam intensity profile with distance is analyzed. It is shown that the angular separation of spots is higher for microlenses with larger number of microlenses per inch or less diameter of the raster. Experimental observations are in good agreement with the calculation results.
Diffraction of light in heterogeneous medium with non-uniform spatial distribution of dielectric nanoparticles taking into account absorption of light is investigated. Influence of dimensional (geometric) effects of nanoparticles on the reflection and transmission curves is shown. In particular, by changing the concentration of dielectric nanoparticles in the medium, complete elimination of side oscillations and suppression of the "tails" of the diffraction reflection curve is achieved. The possibility of controlling the hardware function of acousto-optic devices by changing the material, concentration, size, shape and spatial orientation of the inclusions, as well as the polarization of the incident radiation is shown.
Multiview 3D display system consisting of four full HD projectors and optical screen consisting of microlens array film is designed. Matlab codes for integration of 2D images captured at different angles into one common 3D file are created and 3D images are demonstrated.
Influence of incident light beam coherence on the uniformity in the intensity distribution of diffracted beam by microlens array is investigated. Optical efficiency is calculated for different polarizations. It is shown that the intensity profile and radiation pattern of LED source beam diffracted by periodic micro-lens array are highly uniform and insensitive to the wavelength of incident beam. The spreading angle and output efficiency of the diffracted beam is more sensitive to the aspect ratio of microlens array (MLA). The bigger aspect ratio the higher spreading angle and lower the output efficiency. For a given spreading angle the aspect ratio can be decreased substantially if high-index material is used. Significant influence of wave-front curvature and polarization of incident beam on the reflectance and transmittance is shown.
In this paper the designs of secondary lenses for LED of reflective and refractive types are proposed for extended sources. The lens surface profile for desired illumination pattern on a screen can be obtained by solving first-order differential equations based on the Snell’s law and the energy conservation. Intensity distributions on a target screen were received by ray tracing using Zemax software. High efficiency ultra-slim lenses with illumination areas exceeding the distance between the LED chip and screen by more than six times are demonstrated for different chip sizes. Aspheric lenticular and two-dimensional microlens arrays are designed using wave-optics and ray-tracing methods. Possibility of development of high resolution and wide viewing angle 3D display based on free-form backlight unit is discussed.
In this paper the multi-view 3D display system which includes the modules of capturing three-dimensional objects, image processing (creation of 3D image files) and display screen for the 3D image displaying based on integral imaging technology is developed. Large display screens using multi-projectors are created. Multi-projector system is used for improving the performance, such as viewing resolution, viewing angle, etc. Preliminary experimental results obtained using Full HD multi-projectors are discussed. 3D display based on mobile devices is also developed. 3D image files are created using 2D + depth files and 2D images captured at different view angles. Images on smartphones Sony 4K (resolution 3840 x 2160) and Samsung and LG (resolution 2560 x 1440) are demonstrated.
In this paper an optical element (image rotating cell) consisting of a single piece isotropic material with three internally reflecting faces for image rotation by the angle 90 degrees is proposed. The principle of operation is based on the geometrical phase effect (Berry phase). It is shown that the rotator made of polymer as well as silica glasses is not affected by the chromatic dispersion in a visible range.
Diffraction of light of a visible spectral range by subwavelength metal gratings is investigated theoretically and experimentally. The diffraction efficiencies of the gratings made of various metals (Ni, Ag, Al, etc.) with different depths of the profile are calculated and measurements are carried out. It is demonstrated that under certain conditions an effect of plasmon resonance occurs, at which a complete absorption of the incident light takes place. It is demonstrated, that the influence of the incident beam width on the diffraction efficiency and the electric field profile of the reflected beam is significant for the incident angles, at which the plasmon resonance occurs. It is shown that the incident beam width must be larger than the propagation distance of the surface plasmon in order to couple energy effectively into the plasmon mode.
The influence of regular longitudinally inhomogeneous sections of the waveguides on the level of modal noise, and its dependence on the degree of both spatial and temporal coherence of the radiation source are investigated using the mode approach. The way to reduce modal noise at the joints of waveguides with matching sections between the waveguides is proposed. It is shown that under the matching condition the complete suppression of modal noise due to the joint is possible. A way to reduce modal noise by using random microlens arrays and holographic diffusers is also proposed.
Glassless multi-view projection display system that combines the modules of capturing three-dimensional objects, image processing (creation of 3D files) and display screen with a holographic diffuser is presented. Optical simulations of lenticular and two-dimensional microlens arrays are performed with the aim to determine optimal lenticular sheets, view angle, view number, depth, etc. Effects of crosstalk and ghost-imaging are studied both numerically and experimentally. Multi-projector system is designed and 3D images on 30-inch screen are demonstrated.
Propagation of strongly focused light beams in graded-index planar waveguide and cylindrical fiber is investigated using exact analytical solutions of the wave equation. It is shown that high efficiency transfer of a strongly focused subwavelength spot through optical waveguide over large distances takes place with a period of revival (regeneration). Intensity distributions of a focused light beam and focusing efficiency are simulated. Super-oscillatory hot-spots with the sizes which are beyond the conventional Abbe diffraction limit can be observed at large distances from the source. This can provide the possibility to detect optical super-resolution information in the far-field without any evanescent waves. Far-field super-resolution imaging capabilities of a graded-index waveguide are also analyzed. It is shown that the vector-vortex Laguerre-Gauss modes with polarization-orbital angular momentum (OAM) entanglement are the vector solutions of the Maxwell equations in a graded-index cylindrical waveguide. The wave shape variation with distance taking into account the spin-orbit interaction and nonparaxial effects is analyzed. Effect of long-term periodical revival of wave packets due to mode interference in a graded-index cylindrical optical waveguide is also demonstrated.
Beam combiners and splitters based on the frustrated total internal reflection, diffraction and refraction effects of light beams are considered. New high efficiency prismatic beam combiner consisting of uniform material is proposed.