Infrared Bound States in the Continuum Based on Nanoimprint Lithography with High Quality Factor
摘要
Plasmonic metasurfaces based on Bound States in the Continuum (BIC) have emerged as promising candidates for highly sensitive and specific bio-sensing due to their exceptionally high quality factors and unique tunable resonant modes, making them as a powerful tool within infrared and terahertz region. Nanoimprint Lithography (NIL), a novel design paradigm and fabrication technique for micro and nano scale metasurfaces in recent years, significantly reduces the huge production costs and biological experiment losses associated with conventional bio-sensing metasurfaces, establishing itself as a robust design strategy. However, NIL-based sensor designs are still focus on traditional resonant structures, and the unique optical mechanisms remain underexplored. Here, we firstly realize the BIC plasmonic metasurfaces based on NIL, originating from localized resonant modes within and between the two layers of gold films, exhibiting high quality factors. Additionally, the BIC peaks exhibit a strong response to both the structure rotation angle and incident angle, significantly expanding the mechanisms and application potential of NIL-based metasurfaces.