Proximal High‐Index Metamaterials based on a Superlattice of Gold Nanohexagons Targeting the Near‐Infrared Band

Author:

Shin Dong‐In12,Kim Jeongwon3,Im Seong‐Gyun4,Kang Taewoo4,Wang Ke56,Lee Gaehang2,Kwon Seok Joon47,Park Sungho8,Yi Gi‐Ra5ORCID

Affiliation:

1. SKKU Advanced Institute of Nanotechnology (SAINT) Suwon 16419 Republic of Korea

2. Korea Basic Science Institute Daejeon 34133 Republic of Korea

3. Department of Chemistry Sungkyunkwan University College of Natural Science Suwon 16419 Republic of Korea

4. School of Chemical Engineering Sungkyunkwan University Suwon 16419 Republic of Korea

5. Department of Chemical Engineering Pohang University of Science and Technology (POSTECH) Nam‐Gu Pohang 37673 Republic of Korea

6. School of Materials Science and Engineering Hubei University Wuhan Hubei 430000 China

7. SKKU Institute of Energy Science & Technology (SIEST) Department of Semiconductor Convergence Engineering and Department of Future Energy Engineering Sungkyunkwan University (SKKU) 2066 Seobu‐ro, Jangan‐gu Suwon 16419 Republic of Korea

8. Department of Chemistry Yonsei University Seoul 03722 Republic of Korea

Abstract

AbstractPlasmonic nanoparticles can be assembled into a superlattice, to form optical metamaterials, particularly targeting precise control of optical properties such as refractive index (RI). The superlattices exhibit enhanced near‐field, given the sufficiently narrow gap between nanoparticles supporting multiple plasmonic resonance modes only realized in proximal environments. Herein, the planar superlattice of plasmonic Au nanohexagons (AuNHs) with precisely controlled geometries such as size, shape, and edge‐gaps is reported. The proximal AuNHs superlattice realized over a large area with selective edge‐to‐edge assembly exhibited the highest‐ever‐recorded RI values in the near‐infrared (NIR) band, surpassing the upper limit of the RI of the natural intrinsic materials (up to 10.04 at λ = 1.5 µm). The exceptionally enhanced RI is derived from intensified in‐plane surface plasmon coupling across the superlattices. Precise control of the edge‐gap of neighboring AuNHs systematically tuned the RI as confirmed by numerical analysis based on the plasmonic percolation model. Furthermore, a 1D photonic crystal, composed of alternating layers of AuNHs superlattices and low‐index polymers, is constructed to enhance the selectivity of the reflectivity operating in the NIR band. It is expected that the proximal AuNHs superlattices can be used as new optical metamaterials that can be extended to the NIR range.

Funder

National Research Foundation of Korea

Korea Toray Science Foundation

Publisher

Wiley

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