Light‐Directed Soft Mass Migration for Micro/Nanophotonics

Kim, Kwang‐Jin; Park, Haedong; Park, Kyung Jin; Park, Sung Hun; Kim, Hyeon Ho; Lee, Seung-Woo

doi:10.1002/adom.201900074

Cited by 39 publications

(23 citation statements)

References 297 publications

(1,251 reference statements)

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“… 25 − 29 Due to the nondestructive nature of this method, even reversible surface structuring has become feasible. 30 − 32 The resulting structured surfaces have found applications in, e.g., photonics 26 , 28 , 33 and wettability, 34 , 35 as well as in cell adhesion and orientation. 36 − 38 To further expand the hierarchical surface wrinkles, various attempts have been reported on coupling the all-optical azopolymer pattern inscription technique with other methods, such as soft lithography, 39 , 40 thermally induced fluidization, 39 and external mechanical stimuli.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Hierarchical Surface Patterns by Coupling Optical Patterning and Thermal Shrinkage

Shirazi

Dong

Niskanen

et al. 2021

ACS Appl. Mater. Interfaces

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Herein, a simple hierarchical surface patterning method is presented by effectively combining buckling instability and azopolymer-based surface relief grating inscription. In this technique, submicron patterns are achieved using azopolymers, whereas the microscale patterns are fabricated by subsequent thermal shrinkage. The wetting characterization of various topographically patterned surfaces confirms that the method permits tuning of contact angles and choosing between isotropic and anisotropic wetting. Altogether, this method allows efficient fabrication of hierarchical surfaces over several length scales in relatively large areas, overcoming some limitations of fabricating multiscale roughness in lithography and also methods of creating merely random patterns, such as black silicon processing or wet etching of metals. The demonstrated fine-tuning of the surface patterns may be useful in optimizing surface-related material properties, such as wetting and adhesion, producing substrates that are of potential interest in mechanobiology and tissue engineering.

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Section: Introductionmentioning

confidence: 99%

Multiscale Hierarchical Surface Patterns by Coupling Optical Patterning and Thermal Shrinkage

Shirazi

Dong

Niskanen

et al. 2021

ACS Appl. Mater. Interfaces

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“…The mapping studies indicate that the laser-induced displacement of the material is non-destructive, and analogous to the light-induced surface fluidization seen in azobenzene-containing polymer films. [50][51][52] These observations indicate that the ability to cleanly 'machine' (trans-azo)(dioxane) using low-power visible light is an emergent property of the cocrystal formation.…”

Section: Irradiation and Attempted Shaping Of Pure Trans-azo Solidmentioning

confidence: 95%

Low-Power Laser Micro-Shaping of Dye-Volatile Cocrystals: The Gentle Cutting Edge of Photoresponsive Materials

Borchers¹,

Topić²,

Christopherson³

et al. 2021

Preprint

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Cocrystallisation of a fluorinated azobenzene with volatile cocrystal components dioxane or pyrazine yields halogen-bonded cocrystals that can be cut, carved or engraved with low-powered visible laser light. This process, termed cocrystal laser micro-shaping (CLMS), is enabled by cocrystallisation of a visible light dye with a volatile component, giving rise to materials that can be selectively disassembled with micrometer precision using gentle, non-burning irradiation in a commercial confocal microscope setup. The ability to shape and even machine cocrystals in 3D using laser powers between 0.5 and 20 mW, which are 2-4 orders of magnitude lower compared to laser powers used for machining metals, ceramics or polymers, is rationalized by CLMS targeting the disruption of weak supramolecular interactions between cocrystal components, rather than the breaking of covalent bonds in polymers or disruption of ionic structures required for conventional laser beam or focused ion beam machining processes, mainly by high-power laser heating.<br>

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“…This Fourier optical profile can be extended to 2D Fourier optical surfaces (e.g., DOEs) [ 4–19,178–196,207–217,260–262,277–282 ] ) and 3D Fourier optical volumes (e.g., HOEs) [ 20–51,54–56,87–102,218,219 ]

f (x_{1}, x_{3}) = \frac{1}{{false(2 π false)}^{2}} \iint_{- \infty}^{+ \infty} F (k_{1}, k_{3}) e^{false(k_{1} x_{1} + k_{3} x_{3} false)} d k_{1} d k_{3}

…”

Section: Fourier Optics and Photonic Crystalsmentioning

confidence: 99%

Holography, Fourier Optics, and Beyond Photonic Crystals: Holographic Fabrications for Weyl Points, Bound States in the Continuum, and Exceptional Points

Lim

Park

Kang

et al. 2021

Advanced Photonics Research

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Since the 1990s, applications of holography and Fourier optics have been significantly expanded from the spatial modulation of light propagation to the nanofabrication of superlattices. Holographic mixing of multiple beams is found to be highly compatible with unprecedented engineering of 1D, 2D, and 3D superlattices, particularly at the nanoscales. This is essential for the development of champion photonic crystals working at optical frequencies. However, these extensive efforts toward holographic photonic crystals have declined with the failure to obtain a champion photonic crystal and the rapid rise of other important classes of optical modes in the 2010s such as Weyl points, bound state in continuum (BIC), and exceptional points (EPs). To obtain photonic crystals, the symmetric modulations of the sinusoidally distributed real part of permittivity (Re(ε)), that can be considered as waves of matter from the viewpoint of Fourier optics, are sufficient. However, Weyl points, BIC, and EPs demand more complicated and advanced modulation of such as asymmetrically distributed wave of Re(ε) and the coupled Re(ε) and imaginary ε (Im(ε)). It is, therefore, important to determine whether holographic fabrications can be an efficient solution to Weyl points, BIC, and EPs. In this review, a comprehensive overview of holography, Fourier optical surface/volume gratings, and their implementations for Weyl points, BIC, and EPs is presented.

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Light‐Directed Soft Mass Migration for Micro/Nanophotonics

Cited by 39 publications

References 297 publications

Multiscale Hierarchical Surface Patterns by Coupling Optical Patterning and Thermal Shrinkage

Multiscale Hierarchical Surface Patterns by Coupling Optical Patterning and Thermal Shrinkage

Low-Power Laser Micro-Shaping of Dye-Volatile Cocrystals: The Gentle Cutting Edge of Photoresponsive Materials

Holography, Fourier Optics, and Beyond Photonic Crystals: Holographic Fabrications for Weyl Points, Bound States in the Continuum, and Exceptional Points

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