Journal of the European Optical Society-Rapid Publications

http://link.springer.com/journal/41476

List of Papers (Total 90)

Spectral composition of low-coherence interferograms at high numerical apertures

Interference signals in coherence scanning interferometry at high numerical apertures and narrow bandwidth illumination are spectrally broadened. This enables phase analysis within a spectral range much wider than the spectral distribution of the light emitted by the light source. Consequently, different surface features can be resolved depending on the wavelength used for phase...

Scattering of partially coherent surface plasmon polariton fields by metallic nanostripe

BackgroundSurface plasmon polaritons (SPPs) are electromagnetic waves that propagate at a metal-dielectric interface. Until recently, monochromatic, fully coherent SPPs have mainly been considered.MethodsWe investigate by numerical simulations the generation and properties of polychromatic, partially coherent SPPs and their scattering from a nanostripe. We use both in-house and...

An auxiliary field approach for computing optical resonances in dispersive media

We report on an auxiliary field approach for solving nonlinear eigenvalue problems occurring in nano-optical systems with material dispersion. The material dispersion can be described by a rational function for the frequency-dependent permittivity, e.g., by a Drude-Lorentz model or a rational function fit to measured material data. The approach is applied to compute plasmonic...

Guide star based deconvolution for imaging behind turbid media

BackgroundIf structures of interest are hidden beneath turbid layers such as biological tissues, imaging becomes challenging, even impossible. However, if the point spread function of the system is known from the presence of a guide star, application of common deconvolution algorithms can be a convenient approach to reconstruct even heavily scrambled images. In this work, we...

High-speed 3D shape measurement using Fourier transform and stereo vision

BackgroundIn the fast 3D shape measurement, it is an important factor to use the least number of fringe patterns to get the wrapped phase and the wrapped phase is always required to be retrieved to absolute phase. But the process of phase unwrapping may affect the quality of absolute phase. Besides absolute phase retrieval is time-costing especially for high-speed 3D shape...

Multi-spectral random illumination using a liquid crystal spatial light modulator

BackgroundUsing phase-only liquid crystal spatial light modulator (LC-SLM) to generate random illumination is always used in phase-retrieval and single pixel imaging as it have high energy efficiency. While the methods were only used to generate monochromatic illumination. This paper aims to use LC-SLM generating the multi-spectral random illumination.MethodsThe method requires...

Coaxial superposition of Bessel beams by discretized spiral axicons

BackgroundA diffractive spiral axicon can be used for the generation of a vortex beam with orbital angular momentum. The coaxial superposition of multiple vortices can generate a complex field with off-axis optical vortices. These fields are known as optical vortex lattices. In general, this superposition is done by the use of spatial light modulators. Discretization of the...

A liquid progressive multifocal lens adjusted by the deformation of a non-uniform elastic membrane due to the variation of liquid pressure

BackgroundIn this paper, a liquid progressive multifocal lens with solid-liquid structure is demonstrated, which mainly consists of two elastic polydimethylsiloxane (PDMS) membranes, a solid substrate and liquid.MethodsTo realize the adjustment of the focuses progressively, the thickness of one of the membrane is designed non-uniform. By controlling the liquid pressure working on...

Solitons in optical metamaterials with anti-cubic law of nonlinearity by ETEM and IGEM

BackgroundThis paper studies soliton perturbation in optical metamaterials, with anticubic nonlinearity.MethodsTwo integration approaches, namely, the extended trial equation method (ETEM) and the improved G’/Gexpansion method (IGEM) are presented.ResultsBright, dark and singular soliton solutions are retrieved. The existence criteria of these solitons in metamaterials are also...

Sequential and non-sequential simulation of volume holographic gratings

BackgroundIn the development process of holographic displays like holographic Head-Mounted Displays (hHMD) the simulation of the complete optical system is strongly required. This especially includes the correct behaviour of the volume holographic grating (VHG) in terms of its optical function and its diffraction efficiency. The latter is not supported by the current version of...

Determination of calculation parameters for difference approximation of group refractive index of air based on two-point central method

BackgroundThe accurate knowledge of the refractive index of air is very important for environmental compensation in length measurements.MethodsIn this study, we apply difference approximation methods to facilitate the calculation of the group refractive index of air (GRA) over all calculable wavelengths. Our approach involves the determination of a suitable combination of the...

Optical millimeter wave signal generation with frequency 16-tupling using cascaded MZMs and no optical filtering for radio over fiber system

BackgroundAn optical Millimeter Wave (MM-Wave) generation with high frequency multiplication factor is very attractive solution to avoid the use of high frequency local oscillators at the central station. MethodsIn this paper, a frequency 16 tupling technique is demonstrated with the use of four cascaded MZMs. With the proper adjustment of DC bias of the Mach-Zehnder Modulators...

High-quality binary fringe patterns generation by combining optimization on global and local similarity

BackgroundThe recently proposed optimized dithering techniques can improve measurement quality. However, the objective function in these optimization methods just qualifies the global similarity of the pattern while the global optimization methods ignore the influences of local structure.MethodIn order to get high quality binary dithered patterns, this paper presents an algorithm...

Advanced method of global phase shift estimation from two linear carrier interferograms

BackgroundPhase-shifting interferometry is a kind of important technique used in optical interference metrology. This technique has high precision and good stability, which has been widely used in scientific research and industrial production.MethodsThis paper proposes a new method to estimate global phase shift from two interferograms. This method performs algebraic calculation...

Frequency-division-multiplexing based period-coded fringe pattern for reliable depth sensing

The fringe pattern can realize high-resolution and dense depth sensing. However, the phase ambiguity is a challenge in the fringe pattern. In this paper, one period-code pattern is embedded to the fringe pattern by the frequency-division-multiplexing (FDM) framework. The nonparametric skew and De Bruijn sequence are utilized to determine the label of the period. For a more...

Novel accuracy test for multispectral imaging systems based on ΔE measurements

In the printing industry, multispectral line scan cameras are being applied with increasing frequency in print inspection. This field of application requires highly accurate camera systems. In this article, we describe a novel approach to determining the accuracy of multispectral measurements recorded by line scan cameras. The approach is based on Bayesian statistics and paves...

Focal plane model for flat refractive geometry

BackgroundFlow visualization techniques such as uPIV and droplet imaging determine the measurement volume by the focal plane. Thus, an understanding of how the focal plane moves in reference to the camera is necessary when planar interfaces are present between the camera and the focal plane.MethodsUsing geometric optics, a focus model for a camera imaging through multiple...