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

doi:10.1002/adom.202300205

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 journal › Article › peer-review

12 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 language	English
Article number	2300205
Journal	Advanced Optical Materials
Volume	11
Issue number	16
DOIs	https://doi.org/10.1002/adom.202300205
Publication status	Published - 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

Access to Document

10.1002/adom.202300205

Cite this

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title = "Capacitive Enhancements of the Chiroptical Response in Plasmonic Helicoids",

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.",

keywords = "capacitive coupling, chiral plasmonics, circular dichroism, electric dipole, optical magnetism",

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

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: {\textcopyright} 2023 Wiley-VCH GmbH.",

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AU - Im, Eunji

AU - Kim, Ryeong Myeong

AU - Cho, Nam Heon

AU - Han, Jeong Hyun

AU - Ahn, Hyo Yong

AU - Huh, Ji Hyeok

AU - Yoo, Seok Jae

AU - Lee, Seungwoo

AU - Nam, Ki Tae

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N2 - 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.

AB - 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.

KW - capacitive coupling

KW - chiral plasmonics

KW - circular dichroism

KW - electric dipole

KW - optical magnetism

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Capacitive Enhancements of the Chiroptical Response in Plasmonic Helicoids

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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