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Related Concept Videos

Confocal Fluorescence Microscopy01:16

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Polarization-Multiplexed Metalens Enables Switchable and Compact Chromatic Confocal Sensing with Dual-Mode Precision

Zhicheng Zhao1, Yuting Jiang2, Tao Lai1

  • 1College of Intelligence Science and Technology, National University of Defense Technology, Changsha, 410073, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 12, 2025
PubMed
Summary
This summary is machine-generated.

A new metalens-based chromatic confocal sensor offers miniaturized, lightweight, and adaptable optical metrology. This innovative design enables dynamically switchable measurement modes for enhanced industrial and biomedical applications.

Keywords:
3D measurementchromatic confocal measurementmetasurface

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Area of Science:

  • Optics and Metrology
  • Nanophotonics and Metasurfaces

Background:

  • Chromatic confocal measurement is a non-contact, high-precision technique vital for industrial manufacturing and biomedical imaging.
  • Conventional refractive lens systems present limitations in size, weight, and flexibility, hindering their use in diverse applications.

Purpose of the Study:

  • To develop a miniaturized and multifunctional chromatic confocal sensor by breaking conventional design paradigms.
  • To leverage metalens technology for enhanced performance and adaptability in optical metrology.

Main Methods:

  • Utilized a polarization-multiplexed metasurface to create a novel chromatic confocal sensor.
  • Implemented dynamically switchable measurement modes within the sensor design.
  • Tested system performance, including measurement range and axial accuracy, under specific illumination conditions.

Main Results:

  • Achieved a 10-fold miniaturization (Ø1 mm) compared to conventional systems.
  • Demonstrated dynamically switchable measurement modes, including high-accuracy and extended-range capabilities.
  • Attained measurement ranges of 400 µm and 1.57 mm with axial accuracies of ±0.25 µm and ±1.45 µm, respectively.

Conclusions:

  • The novel metalens-based chromatic confocal sensor offers significant advantages in size, weight, and functionality for optical metrology.
  • Successfully demonstrated the sensor's capability to measure 3D topography and material thickness.
  • Established a new design framework for adaptive, multi-functional metrology systems with great practical potential.