نتایج جستجو برای: refractive surfaces

تعداد نتایج: 150251  

2012
R. P. Rocha

This paper presents the fabrication of an array of high aspect ratio photoresist based refractive microlenses (ML) using photolithography and thermal reflow. First, and in order to evaluate and predict the MLs optical properties and physical dimensions, finite element analysis was done. These simulations helped to design the super high resolution chrome on soda lime glass photomask as well as t...

Journal: :Comput. Graph. Forum 2009
Chris Wyman Greg Nichols

Caustic maps provide an interactive image-space method to render caustics, the focusing of light via reflection and refraction. Unfortunately, caustic mapping suffers problems similar to shadow mapping: aliasing from poor sampling and map projection as well as temporal incoherency from frame-to-frame sampling variations. To reduce these problems, researchers have suggested methods ranging from ...

Journal: :Micromachines 2016
Noha Gaber Yasser M. Sabry Frédéric Marty Tarik Bourouina

In the scope of miniaturized optical sensors for liquid refractometry, this work details the design, numerical simulation, and experimental characterization of a Fabry-Pérot resonator consisting of two deeply-etched silicon cylindrical mirrors with a micro-tube in between holding the liquid analyte under study. The curved surfaces of the tube and the cylindrical mirrors provide three-dimensiona...

Journal: :Optics express 2013
Carlos Errando-Herranz Farizah Saharil Albert Mola Romero Niklas Sandström Reza Zandi Shafagh Wouter van der Wijngaart Tommy Haraldsson Kristinn B Gylfason

We present a novel integration method for packaging silicon photonic sensors with polymer microfluidics, designed to be suitable for wafer-level production methods. The method addresses the previously unmet manufacturing challenges of matching the microfluidic footprint area to that of the photonics, and of robust bonding of microfluidic layers to biofunctionalized surfaces. We demonstrate the ...

Journal: :Analytical chemistry 2007
Angela De Leebeeck L K Swaroop Kumar Victoria de Lange David Sinton Reuven Gordon Alexandre G Brolo

A microfluidic device with integrated surface plasmon resonance (SPR) chemical and biological sensors based on arrays of nanoholes in gold films is demonstrated. Widespread use of SPR for surface analysis in laboratories has not translated to microfluidic analytical chip platforms, in part due to challenges associated with scaling down the optics and the surface area required for common reflect...

Journal: : 2022

Basic understandings on the concept of geometric phase, also known as Pancharatnam – Berry and its application to creation photonic liquid crystal devices thin-films photoaligned nematic crystals are presented. The significance strong azimuthal anchoring energy role birefringence in photoalignment layer for formation phase gradients shown. dependence retardation circular polarised light passing...

Journal: :Journal of Photonics for Energy 2021

Structured surfaces are used to reduce reflection and enhance light-trapping in silicon solar cells. In this simulation study, we investigated the relationship between refractive index of front-side coupling structures on top planar wafer-based crystalline cells performance structures. A crossed diffraction grating with a period 1 μm random pyramid varying indices were considered. Simulations c...

Journal: :Epj Web of Conferences 2022

We propose an experimental method that allows the investigation of droplets on liquid-repelling surfaces. The described technique goes beyond standard imaging approaches and reveals a plethora spatial droplet information, which is usually unavailable. Liquid lenses shape transmitted light field Gaussian laser beam passing though them, thereby forming refracted three-dimensional (3D) landscapes....

Journal: :Applied optics 2008
R M A Azzam H K Khanfar

The net differential phase shift Delta(t) introduced between the orthogonal p and s linear polarizations after four successive total internal reflections inside an in-line chevron dual-Fresnel-rhomb retarder is a function of the first internal angle of incidence phi and prism refractive index n. Retardance of 3lambda/4 (i.e., Delta(t)=270 degrees) is achieved with minimum angular sensitivity wh...

Journal: :Nanoscale 2013
Jung Woo Leem Jae Su Yu

We fabricated the multi-stacked graded refractive index (GRIN) porous amorphous germanium (a-Ge) films with linear, quintic, and Gaussian index profiles for their refractive indices at a wavelength of 1.33 μm by e-beam evaporation with a glancing angle deposition technique. The porous a-Ge films with inclined nanocolumnar structures were deposited on Ge substrates at incident vapor flux angles ...

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