Optically Left-Handed Nanopearl Beads with Inductance-Capacitance Circuits at Visible-Near-Infrared Frequencies Based on Scalable Methods

Seung Beom Pyun, Min Gyu Kim, Sung Wook Kim, Ji Eun Song, Hyun Ik Jeon, Sangho Kim, So Jung Park, Eun Chul Cho

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Optically left-handed materials refract the propagating light in the opposite direction. Most research has focused on the design of various structures, including split-ring resonators, either on planes or in particle cluster forms to resonate with specific light frequencies. However, for particle-based materials, the circuital structures for optical left-handedness have not been fully understood and the effect of interior structure on the optical handedness have not been investigated. Additionally, scalable methods to deploy the unique characteristics of the materials have not been reported so far and are still urgent. Here, optically left-handed nanopearl beads are synthesized in up to 1.25 L solutions. Nanopearl beads contain assembled Au nanocolloids, a dielectric sphere, and a thin silica layer that fixes the assembled structures to sustainably yield unique inductance-capacitance circuits at specific visible-near-infrared frequencies. The frequencies are tunable by modulating the interior structures. Investigation of the circuit structures and Poynting vectors generated within the nanopearl beads suggest the likelihood of their left-handedness. Moreover, the effects of interior structures on the optical handedness of the nanopearl beads are extensively investigated. The results could help commercialize optically left-handed materials and pioneer fields that have not been realized so far.

Original languageEnglish
Pages (from-to)7121-7129
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number5
StatePublished - 9 Feb 2022

Bibliographical note

Funding Information:
S.B.P., M.G.K., S.W.K., J.E.S., H.I.J., and E.C.C. acknowledge the support of National Research Foundation of Korea (NRF) grants funded by the Korea government, 2015R1A2A2A01007003 and 2019R1A2C1004306. S.-J.P. acknowledges the support of the NRF grant NRF-2017R1A5A1015365.

Publisher Copyright:
© 2022 American Chemical Society.


  • inductance-capacitance circuit
  • left-handed materials
  • nanopearl beads
  • negative refraction
  • scalable production


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