Free-space meta-optics with ultrahigh quality(Q)-factor at visible wavelengths is demanded but very challenging to achieve due to the fabrication imperfections. Here, the authors design an etch-free metasurface with minimized fabrication defects and experimentally demonstrate a million-Q resonance at 779 nm wavelength.
- Jie Fang
- Rui Chen
- Arka Majumdar
