2012杭州薄膜会议第4个ppt：Dielectric structured components

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2012杭州薄膜会议:4个ppt：
Dielectric structured components for giant enhancement of optical field
Field amplification within optical devices is a classical challenge that has found numerous applications for bio-sensors and low laser threshold, micro-cavities Photonic cristals are most often used in guided-wave optics but thin films play the key role in free space optics. Most devices involve thin metallic layers so-called plasmonic devices, due to high stability, low cost and standard technology. Enhancement of the stationary field is well-known in narrow-band filters. With transparent Fabry-Perot devices at normal incidence with $p = 2(q+1)$ layers in each mirror, it is proportional to a power of the index ratio $\beta = n_H/n_L$, that is: \begin{equation} \label{eq:e} SI = |E_{max}/E_{0}^{+}|^{2} \approx \beta^{(2(p-2))} \end{equation} with $n_H$ and $n_L$ the refractive indices of high and low index materials. However with such devices the field remains confined within the spacer layer and provides weak sensitivity to the surrounding media. For this reason total reflection is preferred, due an evanescent field in the substrate where contamination or pollution can be directly detected. For an efficient sensitivity, the field should the higher in this medium, which justifies efforts to optimize the design. In this paper we show how multi-dielectric structures allow to reach optimized amplification, that is, a field enhancement much higher than that of plasmonic devices. The gain on the magnitude order is huge but is accompanied by a reduction of stability that we will quantify.
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