Lossy gradient index metamaterial with sinusoidal periodicity of refractive index: case of constant impedance throughout the structure

2011 ◽  
Vol 5 (1) ◽  
pp. 051804 ◽  
Author(s):  
Mariana Dalarsson
Keyword(s):  
Refractive Index ◽  
Index Case ◽  
Gradient Index ◽  
Constant Impedance

scholarly journals 3D printed gradient index glass optics

2020 ◽  
Vol 6 (47) ◽  
pp. eabc7429
Author(s):  
Rebecca Dylla-Spears ◽  
Timothy D. Yee ◽  
Koroush Sasan ◽  
Du T. Nguyen ◽  
Nikola A. Dudukovic ◽  
...  
Keyword(s):  
Refractive Index ◽  
Additive Manufacturing ◽  
Flat Glass ◽  
Gradient Index ◽  
Direct Ink Writing ◽  
Optical Functions ◽  
3D Printed ◽  
Gradient Refractive Index ◽  
Compositional Gradients ◽  
Glass Optics

We demonstrate an additive manufacturing approach to produce gradient refractive index glass optics. Using direct ink writing with an active inline micromixer, we three-dimensionally print multimaterial green bodies with compositional gradients, consisting primarily of silica nanoparticles and varying concentrations of titania as the index-modifying dopant. The green bodies are then consolidated into glass and polished, resulting in optics with tailored spatial profiles of the refractive index. We show that this approach can be used to achieve a variety of conventional and unconventional optical functions in a flat glass component with no surface curvature.

On Fourier's Phase and Gradient Index Optical Design

1994 ◽  
Vol 374 ◽  
Author(s):  
Peter D. Haaland
Keyword(s):  
Refractive Index ◽  
Fourier Transform ◽  
Constrained Optimization ◽  
Phase Modulation ◽  
Fourier Transforms ◽  
Optical Design ◽  
Optical Filters ◽  
Gradient Index ◽  
Design Objective ◽  
The Relationship

AbstractGradient index or rugate optical filters are continuous generalizations of the familiar quarterwave stack which find widespread applications in sensor hardening. In the design of a filter or mirror there are infinitely many refractive index profiles n(x) whose wavelength-dependent reflectance R(λ) is specified as a design objective. The relationship between R(λ) and n(x) is nearly that of a Fourier-transform pair. Exploiting this relationship, specifically the physically indeterminate phase of the Fourier transforms, permits constrained optimization of rugate designs. In this contribution we outline the approach of optimal phase modulation and indicate by examples its application to problems in optical limiting.

Refractive-index profiling of planar gradient-index waveguides by phase-measuring microinterferometry

1994 ◽  
Vol 33 (16) ◽  
pp. 3342 ◽  
Author(s):  
Matgorzata Sochacka ◽  
Elena Lopez Lago ◽  
Zbigniew Jaroszewicz
Keyword(s):  
Refractive Index ◽  
Gradient Index
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