Self-assembled pagoda-like nanostructure-induced vertically stacked split-ring resonators for polarization-sensitive dichroic responses

Sanghoon Kim; Chunghwan Jung; Jungho Mun; Mooseong Kim; Hyeongkeon Yoon; Junho Jang; Myeongcheol Go; Jaeyong Lee; Junsuk Rho; Jin Kon Kim

doi:10.1186/s40580-022-00331-9

Self-assembled pagoda-like nanostructure-induced vertically stacked split-ring resonators for polarization-sensitive dichroic responses

Nano Converg. 2022 Sep 7;9(1):40. doi: 10.1186/s40580-022-00331-9.

Authors

Sanghoon Kim^#¹, Chunghwan Jung^#², Jungho Mun^#³, Mooseong Kim¹, Hyeongkeon Yoon¹, Junho Jang¹, Myeongcheol Go¹, Jaeyong Lee¹, Junsuk Rho^{4

5

6}, Jin Kon Kim⁷

Affiliations

¹ National Creative Research Initiative Center for Hybrid Nano Materials By High-Level Architectural Design of Block Copolymer, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
² Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
³ Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
⁴ Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea. jsrho@postech.ac.kr.
⁵ Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea. jsrho@postech.ac.kr.
⁶ POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics, Pohang, 37673, Republic of Korea. jsrho@postech.ac.kr.
⁷ National Creative Research Initiative Center for Hybrid Nano Materials By High-Level Architectural Design of Block Copolymer, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea. jkkim@postech.ac.kr.

^# Contributed equally.

Abstract

Stacked split-ring resonators (SSRR) arrays exhibiting polarization-sensitive dichroic responses in both visible and near-infrared wavelengths are realized over a centimeter-scale large area. The SSRR arrays are derived from pagoda-like nanorods fabricated from the self-assembly of a lamellae-forming polystyrene-b-poly (methyl methacrylate) copolymer (PS-b-PMMA) confined in cylindrical pores of anodized aluminum oxide (AAO) template. Along the nanorod direction, PS and PMMA nanodomains were alternately stacked with the same distance. Silver crescents and semi-hemispherical covers, which are essential for SSRR with the polarization sensitivity, were obliquely deposited on the single side of the nanorod after removing the AAO template and reactive-ion etching treatment. These sophisticated nanoscale architectures made by bottom-up fabrication can be applied to structural color, optical anti-counterfeiting, and commercial optical components in a large area.

Keywords: Anodized aluminum oxide; Block copolymer; Impedance matching; Large-scale fabrication; Oblique angle deposition; Polarization-sensitive metamaterial.

Abstract

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