Autofocusing plasmon along a curved trajectory with Fourier-space modulation
Phys. Rev. A 113, 023526 – Published 27 February, 2026
DOI: https://doi.org/10.1103/69c3-k3vf
Abstract
In this paper, we introduce the Airyprime plasmon, a surface wave exhibiting unique long focal depth autofocusing along a curved trajectory. This plasmon notably features a highly tunable aspect ratio, which is achieved without altering the structured coupling devices on the metal surface. Furthermore, the plasmon demonstrates a robust self-healing property. Through Fourier-space modulation, we effectively suppress the sidelobe and generate a symmetric Airyprime plasmon. By adjusting a distribution factor, the interference pattern and focusing behavior of symmetric plasmon can be precisely controlled. Theoretical predictions are in good agreement with numerical simulations using the finite-difference time-domain method. Our findings may provide new potential for applications in particle manipulation and super-resolution imaging.
