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Issue 18, 2018
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Enhancing circular dichroism by chiral hotspots in silicon nanocube dimers

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Abstract

Circular dichroism (CD) spectroscopy, which measures the differential absorption of circularly polarized light with opposite handedness, is an important technique to detect and identify chiral molecules in chemistry, biology and life sciences. However, CD signals are normally very small due to the intrinsically weak chirality of molecules. Here we theoretically investigate the generation of chiral hotspots in silicon nanocube dimers for CD enhancement. Up to 15-fold enhancement of the global optical chirality is obtained in the dimer gap, which boosts the CD signal by one order of magnitude without reducing the dissymmetry factor. This chiral hotspot originates from the simultaneous enhancement of magnetic and electric fields and their proper spatial overlap. Our findings could lead to integrated devices for CD spectroscopy, enantioselective sensing, sorting and synthesis.

Graphical abstract: Enhancing circular dichroism by chiral hotspots in silicon nanocube dimers

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Publication details

The article was received on 31 Jan 2018, accepted on 03 Apr 2018 and first published on 04 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR00902C
Citation: Nanoscale, 2018,10, 8779-8786
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    Enhancing circular dichroism by chiral hotspots in silicon nanocube dimers

    K. Yao and Y. Liu, Nanoscale, 2018, 10, 8779
    DOI: 10.1039/C8NR00902C

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