Fig. 3
Higher-order laser mode scanning microscopy of single CdSe quantum rings. a, b Numerically simulated transverse and longitudinal components of a radially polarized Bessel-Gauss laser beam. c, d The corresponding intensity profiles of the transverse c and longitudinal d electromagnetic components. e, f Calculated excitation patterns of a uniaxial TDM lying horizontally e or vertically f on the sample plane. g Experimentally measured excitation patterns of individual CdSe QRs. h Calculated intensity profiles of a horizontally lying uniaxial TDM (curve) and measured intensity profiles from the excitation patterns of a single CdSe QR (dot). The dimensions of a, b, e, f are 1.27 × 1.27 µm2. The dimensions of c, d are 2.53 × 2.53 µm2. The scale bars in g are 1 µm
