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arXiv 1202.5028physics.optics
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普通多孔光学传感器的灵敏度

On the sensitivity of generic porous optical sensors

Tom G. Mackay

摘要:

多孔材料被认为是光学传感的平台。设想多孔材料被包含待感测的试剂的流体渗透。渗透的多孔材料的光学性质的变化为检测待感测的试剂提供了基础。使用均匀化方法的基础上的布鲁格曼形式主义,其中渗透的多孔材料被视为一个均匀化的复合材料,这样的传感器的灵敏度进行了研究。对于相对介电常数$ε^a$的各向同性介电多孔材料和相对介电常数$ε^b$的各向同性介电流体的情况下,发现当$ε^a$和$ε^b$之间存在大的对比度时,灵敏度最大化;在孔隙度的中间范围值处实现最大灵敏度。例如,当$ε^a >> 1$时,对于接近1的$ε^b$可以实现特别高的灵敏度。此外,可以通过结合具有细长球状形状的孔来实现更高的灵敏度。

英文摘要:

A porous material was considered as a platform for optical sensing. It was envisaged that the porous material was infiltrated by a fluid which contains an agent to be sensed. Changes in the optical properties of the infiltrated porous material provide the basis for detection of the agent to be sensed. Using a homogenization approach based on the Bruggeman formalism, wherein the infiltrated porous material was regarded as a homogenized composite material, the sensitivity of such a sensor was investigated. For the case of an isotropic dielectric porous material of relative permittivity $ε^a$ and an isotropic dielectric fluid of relative permittivity $ε^b$, it was found that the sensitivity was maximized when there was a large contrast between $ε^a$ and $ε^b$; the maximum sensitivity was achieved at mid-range values of porosity. Especially high sensitivities may be achieved for $ε^b$ close to unity when $ε^a >> 1$, for example. Furthermore, higher sensitivities may be achieved by incorporating pores which have elongated spheroidal shapes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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