Vacuum Ultraviolet Light-Generating Metasurface.

Area of Science:

• Photonics and Nanotechnology
• Nonlinear Optics
• Materials Science

Background:

• Vacuum ultraviolet (VUV) light is crucial for applications in device fabrication, photochemistry, environmental remediation, microscopy, and spectroscopy.
• Current methods for coherent VUV light generation, like high harmonic generation, often require complex setups, and nonlinear optical crystals for VUV generation are rare.

Purpose of the Study:

• To demonstrate an all-dielectric metasurface for efficient nonlinear optical generation of VUV light.
• To explore the potential of metasurfaces as compact and accessible VUV light sources.

Main Methods:

• Designed and fabricated an all-dielectric metasurface composed of zinc oxide (ZnO) nanoresonators.
• Investigated the optical properties, specifically the magnetic dipole resonance, of the ZnO nanoresonators.
• Excited the metasurface with ultrafast laser pulses at the resonance wavelength to achieve second harmonic generation into the VUV spectrum.

Main Results:

• The ZnO nanoresonator metasurface exhibited a magnetic dipole resonance at 394 nm.
• Efficient second harmonic generation into the VUV spectral region was achieved, producing light at 197 nm.
• The metasurface design allowed for control over the VUV radiation pattern.

Conclusions:

• All-dielectric metasurfaces offer a promising platform for VUV light generation.
• This work paves the way for the development of simple, compact, and tunable VUV light sources.
• The demonstrated technology could enable new applications requiring VUV radiation.