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Needle-like electromagnetic fields has various advantages for theapplications in high-resolution imaging, Raman Spectroscopy, as well aslong-distance optical transportation. The realization of such field oftenrequires high numerical aperture (NA) objective lens and the transmissionmasks. We demonstrate an ultralong needle-like focus in the optical rangeproduced with an ordinary lens. This is achieved by focusing a symmetric Airybeam (SAB) generated via binary spectral modulation with a digital micromirrordevice(DMD). Such amplitude modulation technique is able to shape traditionalAiry beams, SABs, as well as the dynamic transition modes between theone-dimensional(1D) and two-dimensional (2D) symmetric Airy modes. The created2D SAB was characterized through measurement of the propagating fields with oneof the four main lobes blocked by an opaque mask. The 2D SAB was verified toexhibit self-healing property against propagation with the obstructed majorlobe reconstructed after a certain distance. We further produced an elongatedfocal line by concentrating the SAB via lenses with different NA's, andachieved an ultralong longitudinal needle focus. The produced long needle focuswill be applied in optical, chemical, and biological sciences.

Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus