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Enhanced Chiral Sensing with Dielectric Nanoresonators
Barcelona Inst Sci & Technol, ICFO Inst Ciencies Fothn, Barcelona 08860, Spain..
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.ORCID iD: 0000-0002-4437-6291
UPC, Dept Ingn Elect, Barcelona 08034, Spain..
Barcelona Inst Sci & Technol, ICFO Inst Ciencies Fothn, Barcelona 08860, Spain.;ICREA, Barcelona 08010, Spain..ORCID iD: 0000-0001-8995-8976
2020 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 20, no 1, p. 585-591Article in journal (Refereed) Published
Abstract [en]

Chiro-sensitive molecular detection is highly relevant as many biochemical compounds, the building blocks of life, are chiral. Optical chirality is conventionally detected through circular dichroism (CD) in the UV range, where molecules naturally absorb. Recently, plasmonics has been proposed as a way to boost the otherwise very weak CD signal and translate it to the visible/NIR range, where technology is friendlier. Here, we explore how dielectric nanoresonators can contribute to efficiently differentiate molecular enantiomers. We study the influence of the detuning between electric (ED) and magnetic dipole (MD) resonances in silicon nanocylinders on the quality of the CD signal. While our experimental data, supported by numerical simulations, demonstrate that dielectric nanoresonators can perform even better than their plasmonic counterpart, exhibiting larger CD enhancements, we do not observe any significant influence of the optical chirality.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2020. Vol. 20, no 1, p. 585-591
Keywords [en]
Chirality, biosensing, dielectric nanoresonators, circular dichroism, nano-optics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-267169DOI: 10.1021/acs.nanolett.9b04334ISI: 000507151600075PubMedID: 31851826Scopus ID: 2-s2.0-85077653107OAI: oai:DiVA.org:kth-267169DiVA, id: diva2:1391332
Note

QC 20200204

Available from: 2020-02-04 Created: 2020-02-04 Last updated: 2020-02-04Bibliographically approved

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Svedendahl, Mikael

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