Vortex radiation from a single emitter in a chiral plasmonic nanocavity

Nanophotonics

Ge Li¹  Zhang Shuang²  Ma Ren-Min³  Chen Hua-Zhou³  Wang Xing-Yuan³  Wang Suo³ 

[1] Department of Physics and Astronomy, College of Staten Island, CUNY, Staten Island, New York, USA;Department of Physics, University of Hong Kong, Hong Kong, China;State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, China;

关键词: anomalous spontaneous emission;    exceptional point;    nanocavity;    optical vortex;    parity-time symmetry;    single emitter;   

DOI  :  10.1515/nanoph-2021-0743

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown