Reduced volume and reflection for bright optical tweezers with radial Laguerre-Gauss beams.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33008884.
- Also identified by DOI 10.1073/pnas.2014017117 and PMC identifier 7584898.
- Licence recorded as CC BY-NC-ND.
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Abstract
Spatially structured light has opened a wide range of opportunities for enhanced imaging as well as optical manipulation and particle confinement. Here, we show that phase-coherent illumination with superpositions of radial Laguerre-Gauss (LG) beams provides improved localization for bright optical tweezer traps, with narrowed radial and axial intensity distributions. Further, the Gouy phase shifts for sums of tightly focused radial LG fields can be exploited for phase-contrast strategies at the wavelength scale. One example developed here is the suppression of interference fringes from reflection near nanodielectric surfaces, with the promise of improved cold-atom delivery and manipulation.