研究目的
To demonstrate a far-field approach to observe the chiral second-harmonic generation (SHG) at designated visible wavelengths from a single plasmonic vortex metalens and to achieve an enhanced chiral SHG conversion efficiency from monolayer tungsten disulfide (WS2)/aluminum metalens.
研究成果
The study successfully demonstrated an enhanced chiral SHG conversion efficiency from a monolayer WS2/aluminum vortex metalens, about an order of magnitude greater than that of a bare aluminum vortex lens. The chiral SHG from the bare aluminum vortex lens at the C-exciton resonance shows a strong circular dichroism due to the incident-light chirality effects of the plasmonic vortex. The hybrid material approach has the potential to controllably integrate individual chiral hybrid-material systems into large-scale quantum architectures.
研究不足
The study is limited by the near-field techniques used for investigating surface plasmonic vortices, such as scanning near-field optical microscopy (SNOM), photoemission electron microscopy (PEEM), and scanning electron-beam-based cathodoluminescence (CL). The far-field observation of orbital angular momenta from near-field optical chirality is highly desirable but not fully explored.
