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- W4226269564 abstract "Abstract Coherent amplification of chiroptical activity from a molecularly-thin optically-active substance has been a long-standing challenge due to the inherently weak nature of chiral responses. Here we report how a coherent perfect absorber (CPA) enabled by an achiral optical system obeying parity-time ( PT ) symmetry has an enhanced ability to effectively sense molecular chirality of monolayered substances. We demonstrate that such a CPA-based PT -symmetric system enables us in complete darkness to probe a subtle signal change induced by the introduction of a small disturbance, such as adsorbed chiral monolayer, to the unperturbed PT -symmetric system, and allows for absolute measurement and quantitative detection of the magnitude and sign of both real and imaginary parts of the chirality parameter in a background-free environment. Moreover, the CPA-based PT -symmetric system also exhibits three orders of magnitude enhancement in chiroptical responses of molecules, which is consistent with analytical calculations of differential absorption." @default.
- W4226269564 created "2022-05-05" @default.
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- W4226269564 date "2022-04-05" @default.
- W4226269564 modified "2023-10-09" @default.
- W4226269564 title "Enhanced chiroptical responses through coherent perfect absorption in a parity-time symmetric system" @default.
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- W4226269564 doi "https://doi.org/10.1038/s42005-022-00855-w" @default.
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