Robust plasmonic Fano resonance in π-shaped
nanostructure
Supporting Information
Zhendong Yan, 1 Ping Gu,1 Wenjing Bao, 2 Wei Du,1 Zhuo Chen, 1,*
Xinhua Xia,2 and Zhenlin Wang1,*
1
School of Physics and National Laboratory of Solid State Microstructures
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing
210093, China
*Corresponding authors: (Z.C.) zchen@nju.edu.cn
(Z.L.W.) zlwang@nju.edu.cn
2
Contents
Fig. S1 The magnetic diople modes of L-shape and the two π-shaped
nanostructures
Fig. S2 The magnified SEM image of Au PODT array and the calculation of
scattering, absorption and extinction of an individual PODT
Fig. S3 Experimental and calculated transmittance spectra of a single triangle
array upon exposure to the dielectric media with different index of refraction
Fig. S1 The magnetic diople modes of L-shape and the two π-shaped
nanostructures
Fig. S1 The magnetic diople modes of L-shape and the two π-shaped nanostructures
under normal incident excitation with the polarization state shown the top-left. The
schematic of the three types of nanoparticles and the corresponding magnetic field (H),
surface current distributions and vertical component (Hz) of magnetic field are shown
in left, middle and right columns. The corresponding geometrical parameters are
given as the same as shown in Fig. 1 and Fig. 3 in the main text
Fig. S2 The magnified SEM image of Au PODT array and the calculation
of scattering, absorption and extinction of an individual PODT
Fig. S2: a The magnified SEM image of Au PODT array. The distance (d) between
bases of the PODT nanostructures is around 80 nm, which means the plasmonic
coupling between the PODT nanostructure bases is very weak. b The calculated
spectra of scattering, absorption and extinction for an individual Au PODT under
normally incident light with y polarization. The arrows labeled as p3 and p4
correspond to the two plasmonic modes of the corresponding PODT array. c The
simulated absorption spectrum of an individual Au PODT and the transmittance
spectrum of the corresponding PODT array with y polarization. The results plotted in
c show that both a single PODT and the PODT array have almost identical plasmon
modes under the y-polarization excitation, which means that the influence of the
plasmonic coupling between the PODT nanostructure bases is very weak and could be
neglected
Fig. S3 Experimental and calculated transmittance spectra of a single
triangle (ST) array upon exposure to dielectric matrix with different
values of refractive index (n)
Fig. S3: a Experimental and b calculated transmittance spectra for the Au ST sample
exposed to dielectric matrix with different refractive index under a normal incidence
of y-polarized light. c Linear plot of the localized surface plasmon resonance (LSPR)
wavelength shifts of the Au π-shape sample as shown in Fig. 3b in the main text and
Au ST vs refractive index of the embedding medium. The obtained FoM is 3.5 for Au
π-shaped sample and 0.9 for ST