Speaker
Description
Chirality is used to describe an object that is not superposable on its mirror image. Despite having the same chemical structure, most chiral molecules show significant differences in biological activity, being the poison or the drug depending on the handedness. The main difficulty during the measurement of chiral substances is the need to detect extremely weak chiroptical signals from a small concentration of molecules. In this work, we first excite a surface plasmon-polariton via the prism coupling in the attenuated total internal reflection regime with a plane TM-polarized wave in Kretschmann configuration. In this case, the small response in the TE-polarization emerges due to the mixing of electric and magnetic fields. As a result, there is the angular difference between the spectral resonances in right- and left-handed circular polarized waves due to the presence of chiral substance. To characterize the sensitivity of chiral substance detection we consider the amplitude and phase of the differential reflectance and the dependence of the angular shift on the chiral parameter. We aim to increase the angle of divergence between the reflection spectra peaks for the left- and right-handed circular polarization, and accordingly the efficiency of chiral sensing. It may be achieved via the enhancement of the response in TE polarization. Introducing the efficient anisotropic two-dimensional conducting layer instead of the metal film, we improve the efficiency of chiral sensing by about an order of magnitude.
The authors acknowledge the support from the EURIZON Fellowship Programme “Remote Research Grants EU#3003-EURIZON” (no. 871072).
| Type of presence | Presence at Taras Shevchenko National University |
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