Nano Bessel Beam Emitter Using Bragg Microcavity Reflection

The patent transitions from conventional planar optical elements to a vertically stacked three-dimensional microcavity structure. The light-emitting layer is positioned between two Bragg reflecting layers at different vertical levels, creating a confined optical path that generates nanometer-scale Bessel beams through multiple internal reflections, thus achieving dimensional reduction from micrometer to nanometer scale.

The patent embeds the light-emitting layer within a microcavity formed by two Bragg reflecting layers. The light-emitting layer is nested between the first Bragg reflecting layer (with cylindrical through holes) and the second Bragg reflecting layer, creating a compact integrated structure where multiple functional layers are stacked vertically to achieve miniaturization.

The patent combines multiple functions into a single integrated microcavity structure. The light-emitting layer, first Bragg reflecting layer with cylindrical through holes, and second Bragg reflecting layer are merged into one compact device that simultaneously provides light emission, beam shaping, and Bessel beam generation through multiple reflections, eliminating the need for separate optical components.

The patent divides the Bragg reflecting layers into multiple thin reflecting layers with alternating high and low refractive indices. This segmentation allows precise control of optical paths and reflections while maintaining a compact overall structure, enabling the generation of stable nanometer-scale Bessel beams through controlled multiple reflections.