Fig. 4: Near-field harmonic emission profiles obtained in anisotropic and isotropic targets. | Communications Physics

Fig. 4: Near-field harmonic emission profiles obtained in anisotropic and isotropic targets.

From: Topological high-harmonic spectroscopy

Fig. 4

Near-field intensity, ellipticity and phase properties of the 9th (a–f) and 7th (g–l) harmonics in single-layer graphene driven by a \({{{{{{{\mathcal{P}}}}}}}}=1\) and \({{{{{{{\mathcal{P}}}}}}}}=2\) linearly polarized vector beam (LPVB), respectively. The decomposition into polarization components evidences the connection through a mirror transformation of the left circularly polarized (LCP) (c, d, i, j) and right circularly polarized (RCP) (e, f, k, l) intensity and phase distributions. For the sake of comparison, m, n show the near-field LCP component’s intensity and phase distributions of the 25th harmonic in argon driven by a \({{{{{{{\mathcal{P}}}}}}}}=1\) LPVB. The ellipticity ϵ is computed from the Stokes parameters, where ϵ = ±1 corresponds to LCP (+) and RCP (−) fields, respectively.

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