Toward Scalable Flexible Nanomanufacturing for Photonic Structures and Devices

2018

Adv Funct Materials

Periodic submiocrometer pillar arrays are fabricated from a photoresponsive azo molecular glass (IA-Chol) by soft-lithographic hot embossing with elastomeric poly(dimethylsiloxane) (PDMS) modes. Through deformation of each submicrometer-sized pillar in response to the local amplitude and polarization of the superimposed electric waves, optical holograms are recorded on the IA-Chol pillar arrays. When the interference pattern is formed by two polarized beams with opposite-circular polarizations, the recorded patterns mainly reflect the polarization state variations with spatial phase difference of the interfering waves. When two plane waves with the same linear polarizations are superimposed, where the polarization direction is almost the same as the writing beams, the intensity variation of the superimposed electric waves is recorded by the pillar arrays changing spatially with the phase variations. Various ordered surface patterns with distinct hierarchical configurations are successfully developed by the intensity and polarization modulations of the interfering waves. This approach not only allows to directly visualize the intensity and polarization of the coherent light captured by the holograms, but also provides a powerful platform to fabricate various complex surface patterns. The submicrometer pillar arrays can also be used to record polarization hologram and the images are reconstructed by reference light in diffracted spots.

Section: Introductionmentioning

confidence: 99%

Holographic Recording and Hierarchical Surface Patterning on Periodic Submicrometer Pillar Arrays of Azo Molecular Glass via Polarized Light Irradiation

Hsu

2018

Adv Funct Materials

“…The complex micrometer surface patterns show applications in many areas such sensing, optical elements, responsive surfaces and others . Micro/nanofabrication techniques with varying levels of complexity have been developed for fabricating large‐area patterns . Some well‐established techniques include nanoimprint lithography, interference lithography, electron‐beam lithography, focused ion beam lithography, among others.…”

Section: Introductionmentioning

confidence: 99%

Symmetry‐Breaking Response of Azo Molecular Glass Microspheres to Interfering Circularly Polarized Light: From Shape Manipulation to 3D Patterning

Hsu

2018

Adv Funct Materials

This work investigates symmetry-breaking deformation of azo molecular glass microspheres induced by interfering circularly polarized light, and related particle shape manipulation as well as 3D patterning. The isolated microspheres and microsphere monolayers are obtained from an azo molecular glass (IA-Chol) by the solution dispersion method and soft-lithography, respectively. Unique symmetry-breaking deformation is observed for the microspheres upon exposure to the spatially modulated light field, which is produced by interference of two orthogonally polarized laser beams with the right-circular polarization (RCP) and left-circular polarization (LCP). Two distinct deformation modes are developed upon the irradiation with the interfering beams in RCP:LCP and LCP:RCP superposition manners, respectively. The unique morphologies with the symmetry-breaking characteristics are caused by mass transfer induced by the light irradiation. For the microsphere monolayers, the deformations of the microspheres not only capture and record the polarization states of the light field, but also create various surface patterns combining the symmetry-breaking deformations and periodic surface modulation. A variety of unique surface patterns are obtained by irradiation with the interfering circularly polarized waves with the orthogonal and also the same-handed polarizations. The material and methodology developed in this study are promising for applications in sensing, optics, responsive surfaces, and others.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201806703. dichroism (CD) spectroscopy, [4,5] quantumbased optical computing and information processing, [6,7] and all-optical magnetic recording with circularly polarized light, [8] to unmentioned others. As conventional semiconductors lack intrinsic chirality, the handedness of CPL cannot be distinguished and directly detected by ordinary photodetectors. Recently, materials and devices with selective responses to the handedness, such as chiral organic semiconductor transistor, chiral plasmonic metamaterials, and others, [9,10] have been developed for the CPL detection. Compared with conventional methods such as temporal modulation, ellipsometry, and others requiring specific optical set-ups, [11] the approaches based on the newly developed materials show advantages of being highly compatible with various photonic platforms without additional optical elements. Despite the wide-spread use of CPL and interest in its interaction with matter, it has scarcely been reported to use nonchiral material through shape deformation of the substances to capture and store the chirality of the electromagnetic wave. Distinct from the available usages and studies, such a research will not only supply a new method to distinctly detect polarization states of CPL through microscopic observations, but also pave a way toward shape manipulation and three-dimensional (3D) surface patterning with the light.In recent years, photoinduced mass...

“…Furthermore, light manipulation has attracted significant attention in recent years [55][56][57][58][59]. Laser interference technology is one of the promising techniques for the fabrication of 1D, 2D, isotropic, and anisotropic micro/ nanostructures for high-efficiency OLED [14,56,57,60].…”

Section: Structures For Optical Manipulationmentioning

confidence: 99%

Laser interference fabrication of large-area functional periodic structure surface

et al. 2018

Front. Mech. Eng.

Functional periodic structures have attracted significant interest due to their natural capabilities in regulating surface energy, surface effective refractive index, and diffraction. Several technologies are used for the fabrication of these functional structures. The laser interference technique in particular has received attention because of its simplicity, low cost, and high-efficiency fabrication of large-area, micro/nanometer-scale, and periodically patterned structures in air conditions. Here, we reviewed the work on laser interference fabrication of large-area functional periodic structures for antireflection, self-cleaning, and superhydrophobicity based on our past and current research. For the common cases, four-beam interference and multi-exposure of two-beam interference were emphasized for their setup, structure diversity, and various applications for antireflection, self-cleaning, and superhydrophobicity. The relations between multi-beam interference and multi-exposure of two-beam interference were compared theoretically and experimentally. Nanostructures as a template for growing nanocrystals were also shown to present future possible applications in surface chemical control. Perspectives on future directions and applications for laser interference were presented.