Shape‐Controllable Microlens Arrays via Direct Transfer of Photocurable Polymer Droplets

Kang, Daeshik; Pang, Changhyun; Kim, Sang Moon; Cho, Hye Sung; Um, Hyung Sik; Choi, Yong Whan; Suh, Kahp Y.

doi:10.1002/adma.201104507

Cited by 90 publications

(63 citation statements)

References 32 publications

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“…Kang et al used this method to form spherical-cap liquid nano-lenses with diameters ranging from 481 nm to 15.5 μm and contact angles ranging from 9.8° to 90.9° [81]. These lenses could be made from UV-curable polymer to ensure long-term stability.…”

Section: Applications Of Self-assembly To Nano-imagingmentioning

confidence: 99%

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Nano-imaging enabled via self-assembly

McLeod

Ozcan

2014

Nano Today

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SUMMARY Imaging object details with length scales below approximately 200 nm has been historically difficult for conventional microscope objective lenses because of their inability to resolve features smaller than one-half the optical wavelength. Here we review some of the recent approaches to surpass this limit by harnessing self-assembly as a fabrication mechanism. Self-assembly can be used to form individual nano- and micro-lenses, as well as to form extended arrays of such lenses. These lenses have been shown to enable imaging with resolutions as small as 50 nm half-pitch using visible light, which is well below the Abbe diffraction limit. Furthermore, self-assembled nano-lenses can be used to boost contrast and signal levels from small nano-particles, enabling them to be detected relative to background noise. Finally, alternative nano-imaging applications of self-assembly are discussed, including three-dimensional imaging, enhanced coupling from light-emitting diodes, and the fabrication of contrast agents such as quantum dots and nanoparticles.

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Section: Applications Of Self-assembly To Nano-imagingmentioning

confidence: 99%

“…These lenses were used to resolve features with half-pitches as small as 250 nm. Image reproduced with permission from [81]. …”

Section: Figurementioning

confidence: 99%

Nano-imaging enabled via self-assembly

McLeod

Ozcan

2014

Nano Today

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“…This method has been widely used for polymeric materials, and also has recently been adopted to fabricate glass lens arrays [15]. Another approach is to control the shape of liquid lens material before it is solidified, such as using electrowetting to change the contact angle and curvature of a photopolymerizable droplet [16], directly using photopolymerizable materials with various surface tensions [17], or choosing different working temperatures for microstamping using polymeric lens materials [18].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Microlens Arrays by Utilizing Magnetic Hydrodynamic Instability of Ferrofluid Droplets

2014

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This study proposes an actively controllable method for fabrication of polymer microlens arrays. Hexagonal arrays of ferrofluid droplets, which were utilized as the mother-mold masters for microlens molding, were generated by inducing the magnetic hydrodynamic instability under different magnetic fields. To fabricate numerous cavity molds for microlens array molding, we used the field-dependent shapes of the ferrofluid droplets to create different sized molds. For the fabricated microlens arrays, their field-dependent bottom areas, lens height, radii of curvature, and the fill-factor were discussed. Furthermore, performances of the microlenses, including the numerical aperture, focal length, and depth of field, were tested.Index Terms-Ferrofluid droplet, magnetic hydrodynamic instability, microlens array.

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“…1,2 Nanostructures with lens shapes such as micro and nano-lenses provide a unique way to tailor surface optical properties, enabling suitability of the substrate to potential applications in the areas of bioimaging, solar cells, optical nano-sensing, surface antireflective coatings, and optical lithography. [3][4][5][6] In particular, nanolenses are able to overcome the diffraction limit in optical imaging and achieve high resolutions at low light intensities using the nearfield imaging technique. 5,7,8 Individual submicrometer lenses with different sizes and morphologies have been prepared by several methods including chemical growth, 5 chemical reflow, 9 and polymer bread.…”

Section: Introductionmentioning

confidence: 99%

From Nanodroplets by the Ouzo Effect to Interfacial Nanolenses

Peng

Hughes

et al. 2014

Langmuir

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Polymerizing nanodroplets at solid-liquid interfaces is a facile solution-based approach to the functionalization of large surface areas with polymeric lens-shaped nanostructures. In this work, we have applied a one-pot approach to obtain polymeric nanolenses with controlled sizes and densities. We take advantage of the formation mechanism by the direct adsorption of nanodroplets from a surfactant-free microemulsion onto an immersed hydrophobic substrate. The interfacial nanodroplets were photopolymerized to produce polymeric nanolenses on the substrate surface. The surfactant-free microemulsion of the monomer nanodroplets was obtained through the spontaneous emulsification (i.e., ouzo effect) in the tertiary system of ethanol, water, and precusor monomer. The size of nanolenses on the surface was adjusted by the nanodroplet size, following a linear relationship with the ratio of the components in the microemulsion. This simple approach is applicable to produce nanolenses over the entire surface area or on any specific area at will by depositing a drop of the microemulsion. Possessing high optical transparency, the resulting substrates may have potential application as functional biomedical supporting materials or effective light-harvesting coatings.

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Shape‐Controllable Microlens Arrays via Direct Transfer of Photocurable Polymer Droplets

Cited by 90 publications

References 32 publications

Nano-imaging enabled via self-assembly

Nano-imaging enabled via self-assembly

Fabrication of Microlens Arrays by Utilizing Magnetic Hydrodynamic Instability of Ferrofluid Droplets

From Nanodroplets by the Ouzo Effect to Interfacial Nanolenses

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