Fig. 2: Enantiosensitive high-harmonic spectroscopy using chiral topological light with topological charge C = 6.
From: Chiral topological light for detection of robust enantiosensitive observables
a,b, The near-field spatial profile of H18 for L-fenchone (a) and R-fenchone (b). The x- and y-axes are given in units of the field waist at the focus W0. c,d, The corresponding far-field spatial profiles for the two enantiomers are shown in b for L-fenchone and d for R-fenchone. Here kx and ky are given in units of the reciprocal waist of the field at the focus (1/W0). All profiles are normalized to their maximum value, which is the same for opposite enantiomers. The angles in the far-field picture indicate the position of the first peak in the outer ring of the profile, where we set the zero angle along the positive kx direction. For C = 6, we have that ϕL = ϕR + π/3. e–h, Multiphoton diagrams describing the generation of 3N high-harmonic orders in a chiral molecule driven by chiral topological light. Photons carrying SAM σ = ±1 are indicated with co- or counter-clockwise arrows, whereas longitudinally polarized photons are simple arrows. The ℓrω term corresponds to the OAM carried by each photon. e,f, The achiral channels (odd number of photons), where e corresponds to a final SAM of σ = 1 and f to σ = −1. g,h, The chiral channels (even number of photons), for a final SAM of σ = 1 (g) or σ = −1 (h). e–h, A final SAM of the 3N order of σ = 1 (e,g) or σ = −1 (f,h).
