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Resolving enantiomers using the optical angular momentum of twisted light

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Science Advances  11 Mar 2016:
Vol. 2, no. 3, e1501349
DOI: 10.1126/sciadv.1501349
  • Fig. 1 Optical OAM exhibited by twisted LG light can discriminate molecular enantiomers through the strong EQFs generated in unique nanoparticle aggregates.

    In this not-to-scale schematic, the right- and left-handed LG beams (in red) interact differently (green shade) with the chiral molecules (stick-and-ball model) adsorbed to the nanoparticle aggregates.

  • Fig. 2 Asymmetric transmission as a function of OAM value of the light beam.

    OAM can couple to EQFs, as evidenced by the shape of the achiral sample’s curve (red upward triangles) compared to a glass substrate (black squares). OAM is also able to discriminate molecular enantiomers adsorbed in the plasmonic nanoparticle aggregates (green downward triangles, blue diamonds) based on different Q-AT values. Experimental errors are contained within the data points.

  • Fig. 3 HD measurements as a function of OAM value, that is, measuring the difference in transmission for right- and left-handed helical light shows clear discrimination of molecular enantiomers.

    Experimental errors are contained within the data points.

  • Fig. 4 Schematic representation of the optical setup used for measurements with LG beams.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/2/3/e1501349/DC1

    Fig. S1. Transmission and asymmetry of transmission spectra for the achiral samples.

    Fig. S2. Transmission and asymmetry of transmission spectra for the chiral samples.

    Fig. S3. CD spectra of the achiral and chiral samples in both forward and backward direction.

    Fig. S4. Spatial intensity profiles of the produced LG beams.

    Fig. S5. Configuration of the system with visualization of the coordinate axes.

    Model. Phenomenological model for discrimination of molecular enantiomers by LG light.

    References (2124)

  • Supplementary Materials

    This PDF file includes:

    • Fig. S1. Transmission and asymmetry of transmission spectra for the achiral samples.
    • Fig. S2. Transmission and asymmetry of transmission spectra for the chiral samples.
    • Fig. S3. CD spectra of the achiral and chiral samples in both forward and backward direction.
    • Fig. S4. Spatial intensity profiles of the produced LG beams.
    • Fig. S5. Configuration of the system with visualization of the coordinate axes.
    • Model. Phenomenological model for discrimination of molecular enantiomers by LG light.
    • References (21–24)

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