Magnetically induced optical transparency in a plasmon-exciton system

Plasmonic structures such as metal nanoparticles (MNPs) provide a promising way to explore and control light in a solid-state environment. Here, we study a hybrid system composed of a localized surface plasmon mode of a MNP interacting with a semiconductor quantum dot (QD) subject to a Faraday magnetic field. The MNP-QD system is driven by an externally applied probe laser field and then its scattering photons are detected in the far field. To this end, employing a full quantum optical model, we theoretically calculate and demonstrate the scattering spectrum of the system via a combination of analytical and numerical techniques with realistic parameters. It is found that the applied magnetic field can be utilized to efficiently regulate and control the scattering line shapes. In particular, a class of optical transparency is induced in the scattering spectrum of the plasmon-excition (plexcitonic) system that we refer to as magnetically induced plexcitonic transparency. At the same time, a sharp double-Fano resonance profile is generated in the presence of the magnetic field. The predicted features of the spectra have potential applications in designing sensitive on-chip devices.

Automated summary

A hybrid system of metal nanoparticles and semiconductor quantum dots interacting with a Faraday magnetic field shows unique optical properties, which can be utilized in designing sensitive on-chip devices.