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Enhanced optical asymmetry in supramolecular chiroplasmonic assemblies with long-range order
日期：2024-05-02 07:09
浏览次数：221
摘要：DOI: 10.1126/science.abd8576originally published online February 25, 2021
Lu et al., Science 371, 1368–1374 (2021) 26 March 2021
Chiral assemblies of plasmonic nanoparticles are known for strong circular dichroism but not for high
optical asymmetry, which is limited by the unfavorable combination of electrical and magnetic field
components compounded by strong scattering. Here, we show that these limitations can be overcome by
the long-range organization of nanoparticles in a manner similar to the liquid crystals and found in helical
assemblies of gold nanorods with human islet amyloid polypeptides. A strong, polarization-dependent
spectral shift and the reduced scattering of energy states with antiparallel orientation of dipoles
activated in assembled helices increased optical asymmetry g-factors by a factor of more than 4600.
The liquid crystal–like color variations and the nanorod-accelerated fibrillation enable drug screening
in complex biological media. Improvement of long-range order can also provide structural guidance for
the design of materials with high optical asymmetry.
