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We propose a novel infrared nanofilter of localized enhanced field with multiband resonant frequencies. Compared to the resonant wavelength, the structure size is very subwavelength. We establish the effective medium theory to illustrate the light field distribution of the fractals. The loss factor is used to retrieve relative permittivity which is utilized to reproduce of reflection and transmission...
We investigate the impact of rotational symmetry of the metamaterial perfect absorber on its performance. The calculated results show that a absorption peak appears at the same wavelength in the absorption spectrum no matter the polarization of the incident light parallels to x axis or y axis when the absorber possesses four-fold rotational symmetry. However, in the case of two-fold rotational symmetry,...
Electric and magnetic coupling of two split-ring resonators (2SRRs) are numerically studied. Extinction cross section of 2SRRs is computed by Finite-differential time domain (FDTD). It is shown that the two coupling resonant frequencies have large redshift and slight blueshift with decreasing the separation of 2SRRs, respectively. Such phenomenon is explained by dynamic electric dipole theory.
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