Journal
ACS PHOTONICS
Volume 4, Issue 8, Pages 2047-2052Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00479
Keywords
circular dichroism; chiral molecule; chirality; biosensing; plasmonics; metamaterial
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Funding
- Samsung Science and Technology Foundation [SSTF- BA1401-05]
- Korea University Grant
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2017R1A6A3A11034238]
- National Research Foundation of Korea [2017R1A6A3A11034238] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Circular dichroism (CD), the difference in absorption of two opposite circularly polarized light sources by chiral molecules, can be significantly enhanced when molecules are adsorbed on the surface of nanostructures. We present a theory based on Poynting's theorem adapted for chiral media to analyze the surface-enhanced CD of a chiral molecule/nanostructure coupled system. Our theory clarifies the microscopic origin of surface-enhanced CD signals by showing that the enhanced CD has two forms, inherent and induced. The inherent CD is the direct molecular CD that becomes enhanced due to the strongly localized optical helicity density near the nanostructure. The induced CD, previously ignored, derives from asymmetric excitation and absorption of electromagnetic fields inside the nanostructures surrounded by chiral molecules upon the injection of two oppositely circularly polarized light sources. Moreover, it is demonstrated that the induced CD can contribute significantly to the CD signals measured by surface-enhanced chiroptical spectroscopy.
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