Ultrafast Metrology through Nonlinear Plasmonic Metasurfaces

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Conventional ultrafast pulse characterization uses bulk nonlinear crystals, facing bandwidth limitations due to phase-matching conditions.
• The size of these crystals impedes integration into compact, on-chip systems.

Purpose of the Study:

• To present a plasmonic metasurface platform for ultrafast pulse characterization.
• To overcome bandwidth restrictions and bulky size limitations of conventional methods.
• To enable broadband and chip-scale metrology systems.

Main Methods:

• Fabrication of plasmonic nanoantennas with broken structural symmetry on a metasurface.
• Design supporting a broadband electric-dipole resonance around 830 nm.
• Demonstration of metasurface-based interferometric autocorrelator and frequency-resolved optical gating.

Main Results:

• Achieved second-harmonic generation over subwavelength propagation.
• Successfully demonstrated metasurface applications in ultrafast metrology for the first time.
• Characterized photothermal resistance, establishing operational fluence levels for continuous metrology.

Conclusions:

• The plasmonic metasurface platform offers a solution for broadband and chip-scale ultrafast metrology.
• This work paves the way for advanced, integrated optical measurement systems.
• Metasurfaces represent a promising new paradigm for ultrafast optical metrology.