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Interface and spectrum multiplexing ptychographic reflection microscopy
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DOI：10.1016/j.optlaseng.2025.109076.png)
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Abstract
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Reflective ptychography is a promising lensless imaging technique with a wide field of view, offering significant potential for applications in semiconductor manufacturing and detection. However, many semiconductor materials are coated with different layers during processing, which leads to the reflected diffraction light being a coherent superposition of multiple light beams. Traditional phase recovery methods often overlook the multi-layered nature of these materials, resulting in artificial errors and, in some cases, failures in image reconstruction. This limitation has hindered the broader application and adoption of reflection ptychography. We propose and experimentally demonstrate an innovative interface and spectrum multiplexing ptychographic reflection microscopy here. By employing multi-wavelength light as the illumination source, our approach enables the accurate extraction of the wavelength-dependent surface structure imaging and topography mapping of materials in a single experiment. This advancement offers a reliable technique for element-specific detection of semiconductor materials using tabletop extreme ultraviolet light sources in the future.
Keywords:
Lensless imaging
Coherent diffractive imaging
Optical metrology
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