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Total Internal Reflection Fluorescence Microscopy01:05

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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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Diffuse-light all-solid-state invisibility cloak.

Robert Schittny, Andreas Niemeyer, Muamer Kadic

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    Summary
    This summary is machine-generated.

    Researchers developed an all-solid-state invisibility cloak using advanced materials. This improved cloaking performance and light throughput, making objects indistinguishable from their surroundings.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Ideal invisibility cloaks render objects undetectable under all conditions.
    • Previous cloaks operated in the diffusive light regime using liquid-based materials.
    • Limitations included absorption and scattering, affecting cloaking effectiveness.

    Purpose of the Study:

    • To create an all-solid-state invisibility cloak with enhanced performance.
    • To improve light throughput and cloaking efficiency compared to previous designs.
    • To investigate the use of specific materials for a robust cloak.

    Main Methods:

    • Fabrication of a core-shell structure using polydimethylsiloxane (PDMS) with titania nanoparticles for the shell.
    • Utilizing a high-reflectivity microporous ceramic for the core.
    • Testing the cloaking performance and light throughput of the all-solid-state device.

    Main Results:

    • The all-solid-state cloak demonstrated significantly improved cloaking performance.
    • Reduced absorption, particularly from the core, led to better light throughput.
    • The device effectively rendered objects indistinguishable from the surrounding environment.

    Conclusions:

    • The developed polydimethylsiloxane and ceramic-based cloak offers a promising solid-state solution for invisibility.
    • This advancement overcomes limitations of previous liquid-based systems.
    • The improved design paves the way for practical applications of advanced cloaking technologies.