Directed self-assembly of soft 3D photonic crystals for holograms with omnidirectional circular-polarization selectivity
| Autor: | Masanori Ozaki, Misaki Takahashi, Jun Ichi Fukuda, Hiroyuki Yoshida, SeongYong Cho |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Materials science Phase (waves) Holography Physics::Optics 02 engineering and technology Astrophysics::Cosmology and Extragalactic Astrophysics law.invention 03 medical and health sciences Liquid crystal law Astrophysics::Solar and Stellar Astrophysics General Materials Science Soft matter Materials of engineering and construction. Mechanics of materials Circular polarization 030304 developmental biology Photonic crystal 0303 health sciences business.industry 021001 nanoscience & nanotechnology Mechanics of Materials TA401-492 Optoelectronics Photonics 0210 nano-technology business |
| Zdroj: | Communications Materials, Vol 2, Iss 1, Pp 1-9 (2021) |
| ISSN: | 2662-4443 |
| Popis: | Controlling the crystallographic orientation of 3D photonic crystals is important as it determines the behavior of light propagating through the device. Blue phases self-assemble into unique soft 3D photonic crystals with chiral structures for circular-polarization selectivity, but it has remained a challenge to control its 3D orientation. Here, we show that the orientation of blue phases can be precisely controlled to follow a predefined pattern imprinted on a substrate by exploiting field-induced phase transitions. Obtaining the blue phase through the field-induced chiral nematic phase and tetragonal blue phase X results in a highly oriented blue phase I with the crystallographic [001] direction aligned along the surface anchoring. Our approach is applied to fabricating a Bragg-Berry hologram with omnidirectional circular-polarization selectivity, where the hologram is visible only for one circular-polarization under all incident angles. Such devices are difficult to fabricate using conventional optical materials, thereby demonstrating the potential of self-organizing soft matter for photonics. Controlling the alignment of blue phase liquid crystals is challenging. Here, electric-field induced phase transitions are exploited to control the crystal orientation of blue phase I, and applied to the fabrication of holograms with omnidirectional circular-polarization selectivity. |
| Databáze: | OpenAIRE |
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