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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Related Experiment Video

Updated: Apr 12, 2026

Single-Digit Nanometer Electron-Beam Lithography with an Aberration-Corrected Scanning Transmission Electron Microscope
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Single-Digit Nanometer Electron-Beam Lithography with an Aberration-Corrected Scanning Transmission Electron Microscope

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Barrier-free absorbance modulation for super-resolution optical lithography.

Apratim Majumder, Farhana Masid, Benjamin Pollock

    Optics Express
    |May 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Barrier-free Absorbance-Modulation-Optical Lithography (AMOL) simplifies super-resolution patterning. This advanced technique achieves 70nm line features without a protective barrier layer, advancing nanofabrication processes.

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    Patterning via Optical Saturable Transitions - Fabrication and Characterization

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    Area of Science:

    • Nanotechnology
    • Optical Engineering
    • Materials Science

    Background:

    • Super-resolution optical lithography is crucial for fabricating nanoscale devices.
    • Conventional Absorbance-Modulation-Optical Lithography (AMOL) requires a barrier layer, complicating the process.
    • Developing simpler, more efficient lithography techniques is an ongoing challenge.

    Purpose of the Study:

    • To demonstrate a simplified barrier-free Absorbance-Modulation-Optical Lithography (AMOL) process.
    • To achieve high-resolution patterning with reduced process complexity.
    • To explore the fundamental requirements for multi-exposure AMOL to surpass the diffraction limit.

    Main Methods:

    • Utilized simultaneous illumination with two wavelengths (λ1 and λ2) on a photochromic film.
    • Created a deep subwavelength transparent region using a focused spot and a node.
    • Exposed a photoresist layer through the transparent region without an intervening barrier layer.

    Main Results:

    • Successfully demonstrated barrier-free AMOL.
    • Achieved patterning of lines as small as 70nm.
    • Identified key parameters for enabling multiple exposures to break the diffraction limit.

    Conclusions:

    • Barrier-free AMOL significantly simplifies the super-resolution lithography process.
    • The demonstrated method enables high-resolution nanofabrication with fewer steps.
    • Further research into multi-exposure AMOL holds potential for exceeding conventional diffraction limits.