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Abstract
Abstract The ability of chiral media to differentiate circularly polarized light is conventionally characterized by circular dichroism (CD) which is based on the difference in the absorption of the incident light for different polarizations. Thus, CD probes the bulk properties of chiral media. Here, we introduce a new approach termed as circular phase-dichroism that is based on the surface properties and is defined as the difference of the reflection phase for different circularly polarized incident lights in characterizing chiral media. As a demonstration, we measure the reflection phase from planar chiral sawtooth metasurface for circularly polarized light in the visible range using a simple Fabry Perot interference technique. The measured circular phase-dichroism is also crosschecked by conventional CD measurement of the transmitted light and by full-wave simulations. Our results demonstrate the potential applications of circular phase-dichroism in sensing and metasurface characterizations.
Highlights
Metamaterials are man-made structures with sizes much smaller than the wavelengths of interest [1,2,3]
The ability of chiral media to differentiate circularly polarized light is conventionally characterized by circular dichroism (CD) which is based on the difference in the absorption of the incident light for different polarizations
We introduce a new approach termed as circular phase-dichroism that is based on the surface properties and is defined as the difference of the reflection phase for different circularly polarized incident lights in characterizing chiral media
Summary
Metamaterials are man-made structures with sizes much smaller than the wavelengths of interest [1,2,3]. Optical devices made of natural chiral materials have weak optical activities and they are usually very bulky in order to achieve noticeable chiral effects This drawback is circumvented by the use of micro/nanometer-thick chiral metasurfaces in which large optical activities (polarization rotation and circular dichroism) are possible [25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43]. It is only recently that reflection phase is obtained over a wide range in the optical wavelengths using a simple Fabry Perot (FP) interference technique [44, 45] and a cross-polarization method [46]. We propose a new approach in the characterization of chiral metasurfaces using circular phasedichroism based on the reflection phase of circularly polarized incident light of different handedness. Our results demonstrate the potential applications of circular phase-dichroism in sensing and metasurface characterizations
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