Capacitive Enhancements of the Chiroptical Response in Plasmonic Helicoids

Hyeohn Kim, Eunji Im, Ryeong Myeong Kim, Nam Heon Cho, Jeong Hyun Han, Hyo Yong Ahn, Ji Hyeok Huh, Seok Jae Yoo, Seungwoo Lee, Ki Tae Nam

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Chiral plasmonics has been actively pursued since pushing its light-matter interaction to an unnaturally extreme regime. Recently, chirality-encoded metal–insulator–metal (MIM) motifs have promised compelling advantages in advancing chiroptic responses, as they enable a capacitive coupling and its resultant strong electric and magnetic resonances. However, the deterministic control over chiral MIM working at the visible regime is out of reach. Here, large-area MIM resonators are demonstrated using non-lithographically assembled chiral gold nanoparticles (helicoids) and subsequent gold layer deposition, and their boosted chiroptical responses at the visible regime are proven. The thickness of the topcoat Au and the dielectric gap can precisely tune the strength of capacitive coupling. The numerical analyses support that the optimally tuned capacitive coupling in the chiral MIM structure not only strengthens both electric and magnetic dipolar resonances but also makes their spectral positions closer to each other.

Original languageEnglish
Article number2300205
JournalAdvanced Optical Materials
Volume11
Issue number16
DOIs
Publication statusPublished - 2023 Aug 21

Bibliographical note

Funding Information:
H.K. and E.I. contributed equally to this work. This research was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2017M3D1A1039377) and the Challengeable Future Defense Technology Research and Development Program (912909601) of the Agency for Defense Development in 2022. This research was supported by the LG Display under the LGD-SNU Incubation Program. K.T.N. appreciates the support from the Institute of Engineering Research, Research Institute of Advanced Materials (RIAM) and Soft Foundry at Seoul National University. S.L. appreciates the support from the National Research Foundation of Korea under project numbers 2019R1A2C2004846, 2022M3H4A1A02074314, and 2022R1A4A1034315. S.J.Y. was supported by an INHA University research grant.

Funding Information:
H.K. and E.I. contributed equally to this work. This research was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF‐2017M3D1A1039377) and the Challengeable Future Defense Technology Research and Development Program (912909601) of the Agency for Defense Development in 2022. This research was supported by the LG Display under the LGD‐SNU Incubation Program. K.T.N. appreciates the support from the Institute of Engineering Research, Research Institute of Advanced Materials (RIAM) and Soft Foundry at Seoul National University. S.L. appreciates the support from the National Research Foundation of Korea under project numbers 2019R1A2C2004846, 2022M3H4A1A02074314, and 2022R1A4A1034315. S.J.Y. was supported by an INHA University research grant.

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

  • capacitive coupling
  • chiral plasmonics
  • circular dichroism
  • electric dipole
  • optical magnetism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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