Department of Electrical and Computer Engineering, University of Illinois Chicago, Chicago, Illinois 60607, United States.
Department of Electrical and Computer Engineering, Rice University, Houston, Texas 70005, United States.
Nano Lett. 2022 Dec 28;22(24):9788-9794. doi: 10.1021/acs.nanolett.2c01892. Epub 2022 Dec 5.
A system of two-level atoms cooperatively interacting with a photonic field can be described as a single giant atom coupled to the field with interaction strength . This enhancement, known as Dicke cooperativity in quantum optics, has recently become an indispensable element in quantum information technology. Here, we extend the coupling beyond the standard light-matter interaction paradigm, enhancing Dicke cooperativity in a terahertz metasurface with meta-atoms. The cooperative enhancement is manifested through the hybridization of the localized surface plasmon resonance in individual meta-atoms and surface lattice resonance due to the periodic array. Furthermore, through engineering of the capacitive split-gap in the meta-atoms, we were able to enhance the coupling rate into the ultrastrong coupling regime by a factor of . Our strategy can serve as a new platform for demonstrating effective control of fermionic systems by weak pumping, superradiant emission, and ultrasensitive sensing of molecules.
一个由两级原子与光子场协同相互作用的系统可以被描述为一个与场耦合的单个巨型原子，其相互作用强度为 。这种增强作用，在量子光学中被称为狄克合作，最近已成为量子信息技术中不可或缺的元素。在这里，我们将耦合扩展到标准的光物质相互作用范例之外，通过太赫兹超材料中的元原子增强狄克合作。协同增强表现为由于周期性排列而导致的单个元原子中的局域表面等离激元共振和表面晶格共振的杂化。此外，通过元原子中的电容分裂间隙的工程设计，我们能够将耦合速率增强到超强度耦合区域，增强因子为 。我们的策略可以作为一个新的平台，通过弱泵浦、超辐射发射和分子的超高灵敏度传感，展示对费米子系统的有效控制。
