Helical Photonic Metamaterials for Encrypted Chiral Holograms

Choi, Wonjin; Moestopo, Widianto P.; Gu, Songyun; Lee, Taeil; Yoo, Jae‐Hyuck; Xia, Xiaoxing; Armstrong, Michael R.

doi:10.1002/advs.202507931

Helical Photonic Metamaterials for Encrypted Chiral Holograms

Journal Article · Tue Jul 22 00:00:00 EDT 2025 · Advanced Science

DOI:https://doi.org/10.1002/advs.202507931· OSTI ID:2587421

^[1]; Moestopo, Widianto P. ^[1]; Gu, Songyun ^[1]; Lee, Taeil ^[2]; Yoo, Jae‐Hyuck ^[1]; Xia, Xiaoxing ^[1]; Armstrong, Michael R. ^[1]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Gachon University, Incheon (Korea, Republic of)

Helical structures are among the most quintessential three-dimensional (3D) forms that exhibit mirror asymmetry, a hallmark of chirality. Various structural parameters of helices directly linked to chiroptical properties highlight their importance as essential optical metamaterials for polarization-resolved sensors, imaging, and spectroscopies. However, such function-defining properties remain incompletely understood due to fabrication challenges and the lack of a relationship between structure and optical properties. Here, helical structures are analyzed parametrically, and correlations are established that are applicable to the design of chiral helical optical metamaterials. By systematically varying independent parameters—such as from single-turn to five-turn helices and from small major radii to larger ones optimized to fit the unit cell—the underlying relationships with ellipticty are revealed. In addition to theoretical modeling, the findings are experimentally validated using 3D printing and terahertz spectroscopy. The results demonstrate that optimized helical structures are mechanically tunable and exhibit unprecedented optical properties, including broadband and high-magnitude ellipticity spectra. Being embedded in soft elastomers, helical arrays can serve as soft, stretchable optical-mechanical sensors and holograms containing encoded information, such as barcodes and quick response (QR) codes. Chiral QR codes are realized using pixelated single helices with different handedness, demonstrating their potential as advanced encryption/decryption systems for security applications and chiral metaholograms.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2587421

Report Number(s):: LLNL--JRNL-2005979

Journal Information:: Advanced Science, Journal Name: Advanced Science; ISSN 2198-3844

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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