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 ...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.展开更多
采用等温近似,用磁化等离子体的分段线形电流密度卷积(Piecewise Linear Current Density Recursive Convolution,PLCDRC)时域有限差分(Finite-differentce Time-domain,FDTD)算法研究了具有单一缺陷层的一维磁化等离子体光子晶体的缺...采用等温近似,用磁化等离子体的分段线形电流密度卷积(Piecewise Linear Current Density Recursive Convolution,PLCDRC)时域有限差分(Finite-differentce Time-domain,FDTD)算法研究了具有单一缺陷层的一维磁化等离子体光子晶体的缺陷模特性;以高斯脉冲为激励源,用算法公式计算所得的电磁波透射系数,讨论了温度和等离子体层密度对其缺陷模的影响。结果表明:改变温度和等离子体层密度可以获得不同的缺陷模。展开更多
基金Project(N130402006)supported by Fundamental Research Funds for the Central Universities,ChinaProject(51476024)supported by the National Natural Science Foundation of China
文摘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.
文摘采用等温近似,用磁化等离子体的分段线形电流密度卷积(Piecewise Linear Current Density Recursive Convolution,PLCDRC)时域有限差分(Finite-differentce Time-domain,FDTD)算法研究了具有单一缺陷层的一维磁化等离子体光子晶体的缺陷模特性;以高斯脉冲为激励源,用算法公式计算所得的电磁波透射系数,讨论了温度和等离子体层密度对其缺陷模的影响。结果表明:改变温度和等离子体层密度可以获得不同的缺陷模。
