Terahertz Ultrahigh-Q Metasurface Enabled by Out-Of-Plane Asymmetry

• Published in: 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) pp. 01 - 02
• Main Authors: Islam, Md. Saiful, H-Ng, Brian. W., Abbott, Derek
• Format: Conference Proceeding
• Language: English
• Published: IEEE 08-11-2020
• Subjects: Metasurfaces; Optical resonators; Optical sensors; Performance evaluation; Q-factor; Scattering
• ISSN: 2162-2035
• DOI: 10.1109/IRMMW-THz46771.2020.9370414

Owing to strong light confinement ability, the optical resonators are of great interest to the scientific community, however, their optical performances are often limited by the out-of-plane scattering caused by fabrication defects. A physical mechanism known as the Bound States in the Continuum (BIC), can suppress the scattering loss that could lead to improved optical devices. Utilizing the BIC effect, we propose a standard metasurface that can achieve an ultra-high Q factor of 6302. To our knowledge, the achieved Q-factor is the highest achieved by terahertz metasurface so far. Owing to strong light confinement ability, the metasurface is highly sensitive to its surrounding environment.