2026/07/20 by Apoorva D, M Ummal Momeen
Physics and Astronomy · #physics.optics
In conventional optical microscopy, accessing subwavelength information is classically constrained by the Abbe diffraction limit which remains a significant challenge in nanophotonics. To overcome this limitation, we introduce a scheme that generates a tightly confined near-field focal spot under non-diffracting Bessel beam illumination, employing a series of high refractive-index nanoscale structures. Furthermore, the utilization of higher-order Bessel beams enables additional resolution enhancement beyond the diffraction limit. Our results demonstrate a subwavelength resolution of (lambda/53) with a pyramidal nanostructure. To elucidate the factors governing the focusing behavior, we systematically investigate the influence of different geometrical parameters related to the incident Bessel beam on the focusing performance and shows that these factors critically determine the stability and spatial profile of the focal spot. These findings highlight the potential of the proposed approach for various applications in super-resolution imaging and quantum technology.