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Vacuum ultraviolet nonlinear metalens.
Ming Lun Tseng1,2, Michael Semmlinger3,4,5, Ming Zhang4,5,6
1Institute of Electronics, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan.
Science Advances
|April 20, 2022
Summary
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.
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.
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