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Related Experiment Video

Updated: Sep 26, 2025

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

Published on: June 13, 2020

Vacuum ultraviolet nonlinear metalens.

Ming Lun Tseng^1,2, Michael Semmlinger^3,4,5, Ming Zhang^4,5,6

¹Institute of Electronics, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan.

Science Advances

|April 20, 2022

Summary

This summary is machine-generated.

Scientists developed a novel metalens using zinc oxide nanoresonators to generate and focus vacuum ultraviolet (VUV) light. This breakthrough simplifies VUV device design and enhances accessibility for advanced applications.

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Vacuum ultraviolet (VUV) light is crucial for spectroscopy, nanolithography, and biomedical applications.
Developing efficient nanoscale VUV generation and control devices is hindered by a lack of low-loss VUV materials.

Purpose of the Study:

To demonstrate a metalens capable of simultaneously generating and focusing VUV light.
To overcome the limitations of existing VUV materials and systems.

Main Methods:

Fabrication of a metalens using 150-nm-thick zinc oxide (ZnO) nanoresonators.
Utilizing second-harmonic generation to convert 394 nm light into VUV radiation.
Characterization of the focusing and power density enhancement of the generated VUV light.

Main Results:

The ZnO metalens successfully generated and focused VUV light at 197 nm.
Achieved a focused spot diameter of 1.7 μm.
Demonstrated a 21-fold enhancement in power density compared to the incident light.

Conclusions:

The demonstrated metalens is ultracompact and operates without phase-matching requirements.
This technology streamlines VUV system design and enables new applications.
Provides a platform for low-loss VUV components and increased accessibility to the VUV spectrum.