Author Correction: Tunable metasurfaces via the humidity responsive swelling of single-step imprinted polyvinyl alcohol nanostructures

Ko, Byoungsu; Badloe, Trevon; Yang, Younghwan; Park, Jeonghoon; Kim, Jae‐Kyung; Jeong, Hoon Eui; Jung, Chunghwan; Rho, Junsuk

doi:10.1038/s41467-022-34566-1

Cited by 3 publications

(1 citation statement)

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“…Metasurfaces made up of an array of subwavelength nanoantennas can modulate the wavefront of light in the desired manner. Their 2-dimensional nature significantly reduces the thickness of optical devices and allows for the development of flat optics [14][15][16][17][18][19][20][21][22][23][24][25][26]. Plasmonic metasurfaces composed of metallic nanoantennas provide complete 2π phase control by the resonance of nanoantennas [27], but are limited by the intrinsic ohmic loss of metal.…”

Section: Introductionmentioning

confidence: 99%

Realization of high aspect ratio metalenses by facile nanoimprint lithography using water-soluble stamps

Choi

Kim

et al. 2023

PhotoniX

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Nanoimprint lithography (NIL) has attracted attention recently as a promising fabrication method for dielectric metalenses owing to its low cost and high throughput, however, high aspect ratio (HAR) nanostructures are required to manipulate the full 2π phase of light. Conventional NIL using a hard-polydimethylsiloxane (h-PDMS) mold inevitably incurs shear stress on the nanostructures which is inversely proportional to the surface area parallel to the direction of detachment. Therefore, HAR structures are subjected to larger shear stresses, causing structural failure. Herein, we propose a novel wet etching NIL method with no detachment process to fabricate flawless HAR metalenses. The water-soluble replica mold is fabricated with polyvinyl alcohol (PVA) which is simpler than an h-PDMS mold, and the flexibility of the PVA mold is suitable for direct printing as its high tensile modulus allows high-resolution patterning of HAR metalenses. The diffraction-limited focusing of the printed metalenses demonstrates that it operates as an ideal lens in the visible regime. This method can potentially be used for manufacturing various nanophotonic devices that require HAR nanostructures at low cost and high throughput, facilitating commercialization.

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Section: Introductionmentioning

confidence: 99%

Realization of high aspect ratio metalenses by facile nanoimprint lithography using water-soluble stamps

Choi

Kim

et al. 2023

PhotoniX

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Freestanding, Freeform Metamolecule Fibers Tailoring Artificial Optical Magnetism

Kim

et al. 2023

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Metamolecule clusters support various unique types of artificial electromagnetism at optical frequencies. However, the technological challenges regarding the freeform fabrication of freestanding metamolecule clusters with programmed geometries and multiple compositions remain unresolved. Here, the freeform, freestanding raspberry‐like metamolecule (RMM) fibers based on the directional guidance of a femtoliter meniscus are presented, resulting in the evaporative co‐assembly of silica nanoparticles and gold nanoparticles with the aid of 3D nanoprinting. This method offers a facile and universal pathway to shape RMM fibers in 3D, enabling versatile manipulation of near‐ and far‐field characteristics. In particular, the authors demonstrate the ability to decrease the scattering of the millimeter‐scale RMM fiber in visible spectrum. In addition, the influence of electric and magnetic dipole modes on the directional scattering of RMM fibers is investigated. These experiments show that the magnetic response of an individual RMM can be controlled by adjusting the filling factor of gold nanoparticles. The authors anticipate that this method will allow for unrestricted design and realization of nanophotonic structures, surpassing the limitations of conventional fabrication processes.

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Tunable metalensing based on plasmonic resonators embedded on thermosresponsive hydrogel

Ullah¹,

Khalid²,

Ahmed

et al. 2023

Opt. Express

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Metalenses of adjustable power and ultrathin flat zoom lens system have emerged as a promising and key photonic device for integrated optics and advanced reconfigurable optical systems. Nevertheless, realizing an active metasurface retaining lensing functionality in the visible frequency regime has not been fully explored to design reconfigurable optical devices. Here, we present a focal tunable metalens and intensity tunable metalens in the visible frequency regime through the control of the hydrophilic and hydrophobic behavior of freestanding thermoresponsive hydrogel. The metasurface is comprised of plasmonic resonators embedded on the top of hydrogel which serves as dynamically reconfigurable metalens. It is shown that the focal length can be continuously tuned by adjusting the phase transition of hydrogel, the results reveal that the device is diffraction limited in different states of hydrogel. In addition, the versatility of hydrogel-based metasurfaces is further explored to design intensity tunable metalens, that can dynamically tailor the transmission intensity and confined it into the same focal spot under different states, i.e., swollen and collapsed. It is anticipated that the non-toxicity and biocompatibility make the hydrogel-based active metasurfaces suitable for active plasmonic devices with ubiquitous roles in biomedical imaging, sensing, and encryption systems.

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Author Correction: Tunable metasurfaces via the humidity responsive swelling of single-step imprinted polyvinyl alcohol nanostructures

Cited by 3 publications

References 0 publications

Realization of high aspect ratio metalenses by facile nanoimprint lithography using water-soluble stamps

Realization of high aspect ratio metalenses by facile nanoimprint lithography using water-soluble stamps

Freestanding, Freeform Metamolecule Fibers Tailoring Artificial Optical Magnetism

Tunable metalensing based on plasmonic resonators embedded on thermosresponsive hydrogel

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