Optical antennas are key elements in quantum optics emitting and sensing, and behave wide range applications in optical domain. However, integration of optical antenna radiating orbital angular momentum is still a challenge in nano-scale. We theoretically demonstrate a sub-wavelength phased optical antenna array, which manipulates the distribution of the orbital angular momentum in the near fie...

An interesting class of materials are metallic and pearlescent paints. They pose serious challenges to computer graphics since they have high frequencies in both angular and spatial domain, have a complex, pure stochastic spatial structure and angular dependent color shifts. Hybrid approaches that combine model and image-based representations have proven to faithfully reproduce metallic and pea...

In a recent work [1,2,3] this author showed that the diffraction by an impenetrable wedge having arbitrary aperture angle always reduces to a standard Wiener-Hopf factorization. However, he encountered some difficulties in ascertaining the coincidence of WienerHopf solutions with the ones obtained by the Malyuzhinets method. These difficulties are due to the use of two different spectral repres...

Image compression is the science of reducing the size of image file in bytes by reducing the redundancy between pixels in an image without degrading the quality of image so that it can store more images in a given amount of disk or memory space and also it tends to reduces the time required to send the images over the network.Many hardware efficient techniques exist,inspired from it this paper,...

We describe a novel macroscopic fluorescent imaging technique called angular domain fluorescence imaging (ADFI) applicable to the detection of fluorophores embedded in biological tissues. The method exploits the collimation detection capabilities of an angular filter array (AFA). The AFA uses the principle of acceptance angle filtration to extract minimally scattered photons emitted from fluoro...

The stationary monochromatic radiative transfer equation is a partial differential transport equation stated on a five-dimensional phase space. To obtain a well-posed problem, inflow boundary conditions have to be prescribed. The sparse tensor product discretization has been successfully applied to finite element methods in radiative transfer with wavelet discretization of the angular domain (W...

In this paper, we research the indoor distributed multi-input multi-output (MIMO) system. We propose a method based on channel angular domain information feedback to improve the indoor distributed MIMO system capacity and stability. We elaborate on the theoretical analysis and modelling process of this method. The simulation results show that using angular domain information at the transmitter ...

A new low-complexity parameters estimator for multiple two-dimensional (2D) domain incoherently distributed (ID) sources is presented. One 2D domain ID source is parameterized with four parameters, the central azimuth direction-of-arrival (DOA), azimuth angular spread, central elevation DOA and elevation angular spread. Based on the eigenstructure between the steering matrix and signal subspace...