Method for fabricating solid photonic crystals
a photonic crystal and solid technology, applied in the field of photonic crystal fabrication, can solve the problems of inapplicability to solid-state optical apparatus used, difficult to direct synthesize artificial visible-wavelength polymeric photonic crystals, and loss of structural coloration of lamellar photonic crystals
Active Publication Date: 2020-04-23
NAT SUN YAT SEN UNIV
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Benefits of technology
The method successfully maintains the photonic bandgaps and structural colorations in the visible wavelength range, enabling the use of solid photonic crystals in optoelectronic devices, with tunable periodicity and stability, and high mechanical flexibility.
Problems solved by technology
Numerous studies indicate that photonic crystals in butterfly wings exhibit advanced optical properties result of their highly interconnected gyroid microstructures, however, direct synthesizing artificial visible-wavelength polymeric photonic crystals is difficult.
The lamellar photonic crystal loses structural colorations in the solid state so it is not applicable in solid-state optical apparatus used in air.
The periodicity of the 3D network structure in the initial film is too small to form visible or near-infrared photonic bandgap so the initial film is incapable of use in normal optical devices.
Method used
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[0018]With reference to FIG. 1, a method for fabricating solid photonic crystals 10 of the present invention includes step 11 of preparing copolymer solution, step 12 of casting copolymer solution, step 13 of swelling initial film and step 14 of drying solvated film.
[0019]With reference to FIG. 1, firstly, PS-PVP (polystyrene-block-poly(vinylpyridine)) copolymer is dissolved in a chloride-containing solvent to prepare a copolymer solution. The PS-PVP copolymer is an amphiphilic block copolymer composed of hydrophobic PS (polystyrene) blocks and hydrophilic PVP (poly(vinylpyridine)) blocks. Preferably, the PS-PVP copolymer has a molecular weight lower than 500 kg / mol and 58-67 vol % of PS blocks.
[0020]The PS-PVP copolymer may be PS-P2VP (polystyrene-block-poly(2-vinylpyridine)) copolymer or PS-P4VP (polystyrene-block-poly(4-vinylpyridine)) copolymer, and the chloride-containing solvent is a neutral solvent such as chloroform, 1,2-dichloroethane (DCE), 1,1,2-trichloroethane (TCE) and ...
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Abstract
A method, i.e., trapping of structural coloration (TOSC), for fabricating solid 3D network-structured photonic crystals featuring tunable visible structural colorations includes the steps: a PS-PVP copolymer is dissolved in a chloride-containing solvent and is cast as an initial film, the copolymer self-assembles into 3D periodic network-structured morphology; the copolymer in the initial film is swollen in a polar solvent to form a solvated film; the solvated film is dried to form a solid photonic crystal. During evaporation of the polar solvent, the PVP blocks of the copolymer become glassy and form a thin glassy layer on the surface of the solvated film such that the 3D network structures of the copolymer in solvated state can be preserved into the solid photonic crystal revealing the similar periodicity and dimension to that in solvated state, which is very distinct from the film having 1D lamellar structure.
Description
FIELD OF THE INVENTION[0001]This invention generally relates to a method for fabricating photonic crystals, and more particularly to a method for fabricating solid photonic crystals.BACKGROUND OF THE INVENTION[0002]Numerous studies indicate that photonic crystals in butterfly wings exhibit advanced optical properties result of their highly interconnected gyroid microstructures, however, direct synthesizing artificial visible-wavelength polymeric photonic crystals is difficult.[0003]In previous technology, one-dimensional lamellar amphiphilic block copolymers are usually used to fabricate photonic crystals. The lamellar amphiphilic block copolymer could be swollen by solvent to form a solvated photonic crystal exhibiting visible or near-infrared photonic bandgap.[0004]Nevertheless, the solvent evaporates in air continually and the solvated photonic crystal becomes solid. When the solvent evaporates completely, the photonic bandgap blue shifts to UV wavelength range. The lamellar phot...
Claims
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IPC IPC(8): C08J5/18B29C41/00C08J3/11C08J3/09C08J7/02
CPCB29C41/003C08J5/18C08J7/02C08J3/093B29K2029/00C08J3/11B29C41/045B29K2025/06G02B1/005C08J2353/00
Inventor CHIANG, YEO-WANLIN, EN-LIHSU, WEI-LUN
Owner NAT SUN YAT SEN UNIV