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Split Hole Resonator: A Nanoscale UV Light Source.
Pavel N Melentiev1,2, Anton E Afanasiev1, Arthur A Kuzin1,3
1Institute for Spectroscopy Russian Academy of Sciences , Phizicheskaya str., 5, Troitsk, Moscow, 142190 Russia.
Nano Letters
|January 23, 2016
Summary
This study demonstrates that gold nanostructures can generate intense ultraviolet (UV) radiation harmonics. Researchers achieved efficient third harmonic generation (THG) in a split-hole resonator, opening doors for new UV light sources.
Area of Science:
- Nonlinear optics
- Plasmonics
- Nanophotonics
Background:
- Metals' strong light absorption was thought to prevent plasmonic nanostructures from generating UV harmonics.
- Previous research has not explored nonlinear optical interactions in single nanostructures for UV generation.
Purpose of the Study:
- To investigate nonlinear optical interactions in a single gold nanostructure, the split-hole resonator (SHR).
- To demonstrate the feasibility of generating intensive UV radiation harmonics using plasmonic nanostructures.
Main Methods:
- Simultaneously exciting multiple plasmon resonances in an SHR nanostructure using a 6 fs laser pulse.
- Investigating the nonlinear optical response, including second and third harmonic generation (THG), and mixed-frequency generation.
Main Results:
- Achieved strong nonlinear optical interactions at plasmon resonance frequencies.
- Observed second harmonic generation, third harmonic generation (THG), and mixed-frequency light generation.
- The THG near-field amplitude reached 0.6% of the fundamental field, enabling record-high intensity UV radiation.
Conclusions:
- Plasmonic nanostructures, specifically SHRs, can efficiently generate intensive UV harmonics.
- This breakthrough enables the development of novel UV radiation sources with potential biomedical applications, such as cancer therapy.
