We report on simulations and measurements of focusing diffractive optical elements, fabricated as two-level binary optics. The diffractive optical elements are designed to separate and focus four specific wavelengths in the infrared. The simulations are based on a local linear grating model, and predict anomalies similar to Wood's anomalies known from grating diffraction theory. The anomalies a...

In optical devices like diffraction gratings and Fresnel lenses, light wavefront is engineered through the structuring of device surface morphology, within thicknesses comparable to wavelength. Fabrication such diffractive elements involves highly accurate multistep lithographic processes that in fact set into stone both morphology functionality, resulting intrinsically static devices. this wor...

Diffractive optical elements can be realized as ultra-thin plates that offer significantly reduced footprint and weight compared to refractive elements. However, such elements introduce severe chromatic aberrations and are not variable, unless used in combination with other elements in a larger, reconfigurable optical system. We introduce numerically optimized encoded phase masks in which diffe...

Eyeglass-based displays are expected to become a primary visual display option for future wearable computing platforms. There has been several prototypes in the area of eyeglass-based displays. Example of previous designs include the work by Bettinger[1], Spitzer[2] and Kasai[3]. A comprehensive review of designs in the eyeglass formfactor is provided in [4]. In this paper, we explore the possi...

Spatial intensity distributions of the Laguerre-superGauss modes (1,0) as well a super-Gaussian beam with radial and circular polarization were investigated versus changes in height diffractive axicon. The relief optical element varied from 0.25λ to 3λ. modeling by finite-difference time-domain method showed that variations axicon significantly affect diffraction pattern near field smallest foc...

Pixelated liquid crystal displays have been widely used as spatial light modulators to implement programmable diffractive optical elements, particularly diffractive lenses. Many different applications of such components have been developed in information optics and optical processors that take advantage of their properties of great flexibility, easy and fast refreshment, and multiplexing capabi...