Research / 2018 / Article / Fig 2

Research Article

Anisotropically Shaped Magnetic/Plasmonic Nanocomposites for Information Encryption and Magnetic-Field-Direction Sensing

Figure 2

Magnetically controlled angle-dependent plasmonic property of the nanocomposites. (a) Schematic representation of the setup for plasmonic extinction measurement. (b) Extinction spectra measured when changing θ from 0° to 90° by 10° each time. The spectra are measured in a solution with CS2 as the solvent. (c) Extinction spectra of the nanocomposites with θ of 90 ° and 0° and without applying the external magnetic field, respectively. The inset shows the TEM image of a typical nanocomposite. (d) Calculated extinction spectra using the finite-difference time-domain (FDTD) method with θ of 90 ° and 0°. The inset shows the scheme of the nanocomposite used for simulation. (e) Electric field distributions, from left to right, under different excitation wavelengths of each peak as shown in extinction spectra: located at 605 nm, 700 nm, 890 nm, and 1900 nm, respectively. The top row is when incident light polarized along the transverse axis (θ = 90°), and the bottom row is when incident light polarized along the longitudinal axis (θ = 0°).