Million-Q Free Space Meta-Optical Resonator at Visible Wavelengths
Jie Fang, Rui Chen, David Sharp, Enrico M. Renzi, Arnab Manna, Abhinav, Kala, Sander A. Mann, Kan Yao, Christopher Munley, Hannah Rarick, Andrew, Tang, Sinabu Pumulo, Yuebing Zheng, Vinod M. Menon, Andrea Alu, Arka Majumdar

TL;DR
This paper reports the design and fabrication of a free-space visible-wavelength metasurface with a record-high Q-factor of over a million, enabling advanced optical applications and quantum light control.
Contribution
The authors demonstrate a novel free-space metasurface resonator with ultrahigh Q-factor at visible wavelengths, overcoming fabrication challenges and introducing a new spectroscopy technique.
Findings
Achieved a million-Q resonance in free space metasurface.
Developed a high-resolution momentum-space spectroscopy method.
Observed linewidth narrowing with pump power at room temperature.
Abstract
High-quality (Q)-factor optical resonators with extreme temporal coherence are of both technological and fundamental importance in optical metrology, continuous-wave lasing, and semiconductor quantum optics. Despite extensive efforts in designing high-Q resonators across different spectral regimes, the experimental realization of very large Q-factors at visible wavelengths remains challenging due to the small feature size that is sensitive to fabrication imperfections, and thus is typically implemented in integrated photonics. In the pursuit of free-space optics with the benefits of large space-bandwidth product and massive parallel operations, here we design and fabricate a visible-wavelength etch-free metasurface with minimized fabrication defects and experimentally demonstrate a million-scale ultrahigh-Q resonance. A new laser-scanning momentum-space-resolved spectroscopy technique…
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Taxonomy
TopicsPhotonic and Optical Devices · Advanced Fiber Laser Technologies · Advanced Photonic Communication Systems
