渠化和共振隧穿区亚波长分辨率成像的比较
Comparison of imaging with sub-wavelength resolution in the canalization and resonant tunnelling regimes
摘要：
我们比较了金属-介质多层膜在渠化和共振隧穿机制下在可见光波长范围内的亚波长成像特性。分析是基于传输矩阵法和时域仿真。我们表明，点扩散函数的前两个共振的渠化制度是近似高斯的形状。材料损耗抑制了较高谐振的传输，使PSF规则化，但不影响分辨率。在共振隧穿机制中，MTF可以在它们的相位依赖性方面显著变化。所得到的PSF可以具有亚波长厚度，并且可以是宽的，具有多个最大值和快速相位调制。我们表明，PSF的宽度可能会减少进一步在自由空间中的传播，我们提供的参数来解释这一令人惊讶的观察。
英文摘要：
We compare the properties of subwavelength imaging in the visible wavelength range for metal-dielectric multilayers operating in the canalization and the resonant tunnelling regimes. The analysis is based on the transfer matrix method and time domain simulations. We show that Point Spread Functions for the first two resonances in the canalization regime are approximately Gaussian in shape. Material losses suppress transmission for higher resonances, regularise the PSF but do not compromise the resolution. In the resonant tunnelling regime, the MTF may dramatically vary in their phase dependence. Resulting PSF may have a sub-wavelength thickness as well as may be broad with multiple maxima and a rapid phase modulation. We show that the width of PSF may be reduced by further propagation in free space, and we provide arguments to explain this surprising observation.
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