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Related Concept Videos

Reflective Property of Parabolas01:26

Reflective Property of Parabolas

A parabola is a basic type of conic section that results from the intersection of a plane with a double-napped cone in a direction parallel to one of the cone's sides. This U-shaped curve has a distinctive reflective property: all incoming rays parallel to its axis of symmetry are directed toward a single point, known as the focus. This property is widely utilized in optical and communication technologies that require precise signal concentration.In analytic geometry, a parabola is defined as...
Polar Coordinates: Problem Solving01:27

Polar Coordinates: Problem Solving

Directional radiation patterns are central to antenna analysis, as they illustrate how signal strength varies with direction. These patterns are often modeled using polar plots, where the radial distance from the origin represents signal intensity at a given angle. A commonly used idealized form is the four-lobed rose curve, which captures the concept of directional beams in a simplified mathematical form.The four-lobed rose curve, described by r = cos⁡(2θ), features four symmetric lobes, each...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.

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Related Experiment Video

Updated: Jul 6, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
08:48

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

Making an omnidirectional reflector.

B Gallas, S Fisson, E Charron

    Applied Optics
    |March 28, 2008
    PubMed
    Summary
    This summary is machine-generated.

    Designing finite-layer omnidirectional reflectors requires a specific structure. Finishing with a thicker low-index layer enhances reflectivity, enabling advanced optical devices.

    Related Experiment Videos

    Last Updated: Jul 6, 2026

    Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
    08:48

    Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

    Published on: September 25, 2020

    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Omnidirectional reflectors (ODRs) are crucial for optical devices, but finite layer designs present challenges.
    • Optimizing ODRs requires understanding the impact of layer count on reflectivity and spectral performance.

    Purpose of the Study:

    • To investigate the effect of a finite number of layers on ODR design.
    • To develop and realize a-Si-SiO(2) ODRs for near-infrared applications.
    • To enhance visible light transmissivity through post-fabrication annealing.

    Main Methods:

    • Investigated the design principles for finite-layer ODRs.
    • Fabricated two amorphous silicon-silicon dioxide (a-Si-SiO(2)) ODRs on silicon and silica substrates.
    • Annealed the silica-substrate ODR to study recrystallized silicon's properties.

    Main Results:

    • A design trend was identified: terminating with a low-index layer thicker than a quarter-wave enhances reflectivity.
    • Achieved high reflectivity and omnidirectional effects in the near-infrared for both fabricated ODRs.
    • Annealing significantly increased visible light transmissivity of the silica-substrate ODR due to silicon recrystallization.

    Conclusions:

    • Finite layer ODR design can be optimized by strategic layer thickness and material selection.
    • The developed a-Si-SiO(2) ODRs demonstrate suitability for near-infrared applications.
    • Post-fabrication annealing offers a method to improve visible light performance without compromising near-infrared characteristics.