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Modeling infrared radiative properties of nanoscale metallic complex slit arrays

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Abstract

The radiative properties (absorptance, reflectance, and transmittance) of deep slits with five nanoscale slit profile variations at the transverse magnetic wave incidence were numerically investigated by employing the finite difference time domain method. For slits with attached features, their radiative properties can be much different due to the modified cavity geometry and dangled structures, even at wavelengths between 3 and 15 μm. The shifts of cavity resonance excitation result in higher transmittance through narrower slits at specific wavelengths and resonance modes are confirmed with the electromagnetic fields. Opposite roles possibly played by features in increasing or decreasing absorptance are determined by the feature position and demonstrated by Poynting vectors. Correlations among all properties of a representative slit array and the slit density are also comprehensively studied. When multiple slit types coexist in an array (complex slits), a wide-band transmittance or absorptance enhancement is feasible by merging spectral peaks contributed from each type of slits distinctively. Discrepancy among infrared properties of four selected slit combinations is explained while effects of slit density are also discussed.

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Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China

    Ai-hua Wang  (王爱华) & Yi-hong Niu  (牛义红)

  2. Department of Mechanical Engineering, National Cheng Kung University, Tainnan, 701, China

    Yu-bin Chen  (陈玉彬)

Authors
  1. Ai-hua Wang  (王爱华)
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  2. Yi-hong Niu  (牛义红)
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  3. Yu-bin Chen  (陈玉彬)
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Corresponding author

Correspondence to Ai-hua Wang  (王爱华).

Additional information

Foundation item: Project(N130402006) supported by Fundamental Research Funds for the Central Universities, China; Project(51476024) supported by the National Natural Science Foundation of China

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Wang, Ah., Niu, Yh. & Chen, Yb. Modeling infrared radiative properties of nanoscale metallic complex slit arrays. J. Cent. South Univ. 21, 3927–3935 (2014). https://doi.org/10.1007/s11771-014-2380-y

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  • DOI: https://doi.org/10.1007/s11771-014-2380-y

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