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    Area of Science:

    • Microscopy and Imaging Technologies
    • Optoelectronics and Sensor Design
    • Nanotechnology and Materials Science

    Background:

    • Traditional microscopy often faces limitations in spatial resolution and multi-modal sensing capabilities.
    • Developing cost-effective imaging solutions with enhanced resolution is crucial for various scientific applications.
    • Integrating diverse sensing modalities into a single platform can provide richer sample information.

    Purpose of the Study:

    • To present a novel, low-cost contact scanning microscope.
    • To achieve optical imaging with spatial resolution surpassing individual pixel size.
    • To demonstrate the integration of multiple sensory modalities within the microscope design.

    Main Methods:

    • Utilized a 7.5 mm x 3.2 mm CMOS image sensor with 214 scanning lines, each horizontally shifted by 300 nm.
    • Implemented a staggered-pixel organization for enhanced x-dimension resolution, theoretically limited to 300 nm.
    • Integrated multiple sensing modalities including high-resolution, fluorescence, and polarization sensitivity.
    • Employed on-chip column-parallel Delta-Sigma Analog-to-Digital Converters (ADCs) for data digitization.

    Main Results:

    • Achieved effective spatial resolution in the x-dimension below the pixel size, approaching a theoretical limit of 300 nm.
    • Demonstrated an instantaneous scanning window size of approximately 2 mm x 2.5 mm.
    • Successfully integrated five sensory modalities: high-resolution, fluorescence-sensitive, and triple-orientation polarization-sensitive pixels.
    • Validated the concept through experimental measurements emulating contact-scanning.

    Conclusions:

    • The presented low-cost contact scanning microscope offers a viable solution for high-resolution, multi-modal imaging.
    • The staggered-pixel design effectively overcomes pixel size limitations for improved spatial resolution.
    • The integrated multi-modal sensing capabilities provide comprehensive sample characterization.
    • This technology has the potential to advance various fields requiring detailed optical analysis.