• Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Development of a 2D metamaterial that preferentially emits broadband circularly-polarized (CP) infrared radiation is hindered by the fact that orthogonal electric-field components are uncorrelated at the surface of the thermal emitter, a consequence of the fluctuation-dissipation theorem. We achieve broadband CP thermal emission by fabricating a meanderline quarter-wave retarder on a transparent thermal-isolation layer. Behind this isolation layer, in thermal contact with the emitter, is a wire-grid polarizer. Along with an unavoidable linear polarized radiation characteristic from the meanderline, we measured a degree of circular polarization (DOCP) of 28%, averaged over the 8- to 12 μm band.
    Optical Materials Express 06/2011; 1(3):466-479. · 2.92 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Theoretical investigations of the spectral and angular characteristics of 1D semiconductor-based magnetophotonic crystal thermal emission in an external magnetic field are presented. Propagation of the emission is described by the 4 × 4 matrix method using the nonlinear magnetic-field dependence of a semiconductor dielectric tensor. The calculations are carried out for the (ZnS/KBr)2/InAs/(KBr/ZnS)10 structure in the spectral range 8-11 μm. It is established that the thermal emission is narrow-band and narrow-beam and substantially changes in the magnetic field. The results show that the magnetophotonic crystals can be used for creating tunable selective emitters for mid-wave and long-wave infrared spectral ranges.
    Journal of Optics 07/2013; 15(7):5104-. · 2.01 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A unique recipe of achieving compound spiral photonic crystals (CSPCs) in three dimensions by holography is proposed, which is composed of unit cells with double right- handed (RH) spirals of π phase shift. Interferences between side beams in the umbrella-type configurations are employed to generate CSPCs. Chirality is pronounced, and paradoxical high RH transmission peaks appear exactly in the RH polarization gap. Fano resonances, which stems from the mode interferences between left-handed propagating modes along spiral axis (direct pathway) and negative group velocity modes in the extended Brillouin zone (resonance-assisted indirect pathway), is revealed and discussed. By analyzing Fourier spectra and chirality of the photonic eigenmodes, intrinsic mechanism of such a paradox is well understood by the mode coupling theory.
    01/2011;

Full-text

Download
44 Downloads
Available from
Jun 1, 2014