تقرير
Ultra-narrowband terahertz circular dichroism driven by planar metasurface supporting chiral quasi bound states in continuum
العنوان: | Ultra-narrowband terahertz circular dichroism driven by planar metasurface supporting chiral quasi bound states in continuum |
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المؤلفون: | Li, Jitao, Yue, Zhen, Li, Jie, Zheng, Chenglong, Yang, Dingyu, Wang, Silei, Li, Mengyao, Zhang, Yating, Yao, Jianquan |
سنة النشر: | 2022 |
المجموعة: | Physics (Other) |
مصطلحات موضوعية: | Physics - Optics |
الوصف: | Terahertz (THz) chirality pursues customizable manipulation from narrowband to broadband. While conventional THz chirality is restricted by non-negligible linewidth and unable to handle narrowband well. Recently, the concept "quasi bound states in continuum" (quasi-BIC) is introduced to optics resonance system whose the quality factor can be extremely high with the ultra-low radiative loss, thus providing a conceptual feasibility for wave control with ultra-narrow linewidth. Herein, we construct quasi-BIC in a planar all-silicon THz metasurface with in-plane C2 and mirror symmetries breaking. Such system not only exposes the symmetry-protected BIC, but also exposes the parameter-tuned BIC assigned to single resonance type. An extremely narrow linewidth (below 0.06 GHz) with high quality factor (104 level) is obtained at quasi-BIC frequency, which achieves the ultra-narrowband THz chirality. |
نوع الوثيقة: | Working Paper |
DOI: | 10.1016/j.optlastec.2023.109173 |
URL الوصول: | http://arxiv.org/abs/2206.02486 |
رقم الأكسشن: | edsarx.2206.02486 |
قاعدة البيانات: | arXiv |
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