Wang Xing-Yuan, Chen Hua-Zhou, Wang Suo, Ge Li, Zhang Shuang, Ma Ren-Min
State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, China.
Department of Physics and Astronomy, College of Staten Island, CUNY, Staten Island, New York, USA.
Nanophotonics. 2022 Feb 25;11(9):1905-1911. doi: 10.1515/nanoph-2021-0743. eCollection 2022 Apr.
Manipulating single emitter radiation is essential for quantum information science. Significant progress has been made in enhancing the radiation efficiency and directivity by coupling quantum emitters with microcavities and plasmonic antennas. However, there has been a great challenge to generate complex radiation patterns such as vortex beam from a single emitter. Here, we report a chiral plasmonic nanocavity, which provides a strong local chiral vacuum field at an exceptional point. We show that a single linear dipole emitter embedded in the nanocavity will radiate to vortex beam via anomalous spontaneous emission with a Purcell enhancement factor up to ∼1000. Our scheme provides a new field manipulation method for chiral quantum optics and vortex lasers at the nanoscale.
操控单发射体辐射对于量子信息科学至关重要。通过将量子发射体与微腔和等离子体天线耦合，在提高辐射效率和方向性方面已取得显著进展。然而，从单个发射体产生诸如涡旋光束等复杂辐射模式一直是一个巨大的挑战。在此，我们报道了一种手性等离子体纳米腔，它在一个例外点处提供了强局域手性真空场。我们表明，嵌入纳米腔中的单个线性偶极发射体将通过反常自发辐射辐射到涡旋光束，珀塞尔增强因子高达约1000。我们的方案为纳米尺度的手性量子光学和涡旋激光器提供了一种新的场操控方法。
