Highly Chiral Light Emission Using Plasmonic Helicoid Nanoparticles

Author:

Ahn Hyo‐Yong12ORCID,Le Khai Q.1ORCID,Narushima Tetsuya1ORCID,Yamanishi Junsuke1ORCID,Kim Ryeong Myeong3ORCID,Nam Ki Tae3ORCID,Okamoto Hiromi1ORCID

Affiliation:

1. Institute for Molecular Science National Institutes of Natural Sciences 38 Nishigonaka, Myodaiji Okazaki Aichi 444‐8585 Japan

2. Center for Novel Science Initiatives National Institutes of Natural Sciences 4‐3‐13 Toranomon, Minato‐ku Tokyo 105‐0001 Japan

3. Department of Materials Science and Engineering Seoul National University 1 Gwanak‐ro, Gwanak‐gu Seoul 08826 Republic of Korea

Abstract

AbstractMaterials generating circularly polarized luminescence (CPL) have received increasing interest due to their potential applications in bioimaging, sensing, anticounterfeiting, and display technologies. The possibility of efficient CPL generation is explored for organic molecules, inorganic materials, and their hybrid systems. A chiral plasmonic nanostructure is one candidate for generating strong and highly dissymmetric CPL by coupling with the surrounding luminescent material. Here, the inherent luminescence of gold nanoparticles can produce CPL without using any secondary material is suggested. In this study, the generation of circularly polarized two‐photon‐induced photoluminescence (TPI‐PL) from chiral gold nanostructures is demonstrated. Measurements of TPI‐PL show that it has a strong dissymmetry factor of ≈0.7 for a single chiral Au nanoparticle. A theoretical simulation study showed that a local chiral electromagnetic field confined to the chiral gap structures contributes to the high degree of circular polarization in TPI‐PL. It is believed that this work provides a new route for novel CPL‐generating materials with strong dissymmetry and holds promise for various applications using CPL technology.

Publisher

Wiley

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