Xu Yifei, Song Qi, Li Enen, Zhang Min, Sun Zhenhua, Wang Tianwu, Liu Fang, Yan Peiguang
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.
Nanophotonics. 2022 Mar 31;11(8):1619-1628. doi: 10.1515/nanoph-2021-0808. eCollection 2022 Mar.
It is particularly appealing for efficient active terahertz (THz) modulators using photonic structures to enhance light-matter interaction. Here, an optical controlled THz modulator is proposed that combines lead sulfide (PbS) quantum dots with subwavelength metallic split-ring resonators (SRRs) for providing field enhancement. The modulation depth reaches 60.3%, which is approximately 3 times larger than the PbS quantum dots film without SRRs (as reference) in the frequency range of 0.1-1.1 THz. Such significant enhanced THz modulation is mainly due to the local THz field enhancement caused by the SRRs, which is consistent with the simulation result.
对于利用光子结构增强光与物质相互作用的高效有源太赫兹（THz）调制器而言，这尤其具有吸引力。在此，提出了一种光控太赫兹调制器，该调制器将硫化铅（PbS）量子点与亚波长金属开口环谐振器（SRR）相结合以实现场增强。在0.1 - 1.1太赫兹频率范围内，调制深度达到60.3%，这比没有SRR的硫化铅量子点薄膜（作为参考）大约大三倍。如此显著增强的太赫兹调制主要归因于SRR引起的局部太赫兹场增强，这与模拟结果一致。
