Polarization Selective Electromagnetic-Induced Transparency in the Disordered Plasmonic Quasicrystal Structure

We report a resonant plasmonic quasicrystal structure that support multiple bands of electromagnetically induced transparency (EIT) at visible frequencies. The quasicrystal structure is formed by a planar array of thin gold nanodisks arranged in a square lattice. The essential aspect of this quasicrystal is the periodic disorder that couples higher order modes to the broad background resonant mode. It can be noted that the EIT response of disordered quasicrystals having diagonally symmetric unit cells is polarization independent. Conversely, the EIT responses in the quasicrystals are polarization selective, that can be useful for spectral filtering application. Dispersion engineering through light matter interactions in quasicrystals will be interesting for various applications including sensing, display, switching, nonlinear, and slow-light devices.